Vulnerabilites related to dena - h2o
Vulnerability from fkie_nvd
Published
2022-02-01 13:15
Modified
2024-11-21 06:29
Severity ?
7.4 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Summary
h2o is an open source http server. In code prior to the `8c0eca3` commit h2o may attempt to access uninitialized memory. When receiving QUIC frames in certain order, HTTP/3 server-side implementation of h2o can be misguided to treat uninitialized memory as HTTP/3 frames that have been received. When h2o is used as a reverse proxy, an attacker can abuse this vulnerability to send internal state of h2o to backend servers controlled by the attacker or third party. Also, if there is an HTTP endpoint that reflects the traffic sent from the client, an attacker can use that reflector to obtain internal state of h2o. This internal state includes traffic of other connections in unencrypted form and TLS session tickets. This vulnerability exists in h2o server with HTTP/3 support, between commit 93af138 and d1f0f65. None of the released versions of h2o are affected by this vulnerability. There are no known workarounds. Users of unreleased versions of h2o using HTTP/3 are advised to upgrade immediately.
References
| ▶ | URL | Tags | |
|---|---|---|---|
| security-advisories@github.com | https://github.com/h2o/h2o/commit/8c0eca3 | Patch, Third Party Advisory | |
| security-advisories@github.com | https://github.com/h2o/h2o/security/advisories/GHSA-f9xw-j925-m4m4 | Third Party Advisory | |
| af854a3a-2127-422b-91ae-364da2661108 | https://github.com/h2o/h2o/commit/8c0eca3 | Patch, Third Party Advisory | |
| af854a3a-2127-422b-91ae-364da2661108 | https://github.com/h2o/h2o/security/advisories/GHSA-f9xw-j925-m4m4 | Third Party Advisory |
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Vulnerability from fkie_nvd
Published
2016-01-16 05:59
Modified
2025-04-12 10:46
Severity ?
Summary
CRLF injection vulnerability in the on_req function in lib/handler/redirect.c in H2O before 1.6.2 and 1.7.x before 1.7.0-beta3 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via a crafted URI.
References
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Vulnerability from fkie_nvd
Published
2017-12-22 14:29
Modified
2025-04-20 01:37
Severity ?
Summary
Buffer overflow in H2O version 2.2.2 and earlier allows remote attackers to cause a denial-of-service in the server via unspecified vectors.
References
| ▶ | URL | Tags | |
|---|---|---|---|
| vultures@jpcert.or.jp | https://github.com/h2o/h2o/issues/1460 | Third Party Advisory | |
| vultures@jpcert.or.jp | https://jvn.jp/en/jp/JVN84182676/index.html | Third Party Advisory, VDB Entry | |
| af854a3a-2127-422b-91ae-364da2661108 | https://github.com/h2o/h2o/issues/1460 | Third Party Advisory | |
| af854a3a-2127-422b-91ae-364da2661108 | https://jvn.jp/en/jp/JVN84182676/index.html | Third Party Advisory, VDB Entry |
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Vulnerability from fkie_nvd
Published
2024-10-11 15:15
Modified
2024-11-12 19:59
Severity ?
3.7 (Low) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. When h2o is configured as a reverse proxy and HTTP/3 requests are cancelled by the client, h2o might crash due to an assertion failure. The crash can be exploited by an attacker to mount a Denial-of-Service attack. By default, the h2o standalone server automatically restarts, minimizing the impact. However, HTTP requests that were served concurrently will still be disrupted. The vulnerability has been addressed in commit 1ed32b2. Users may disable the use of HTTP/3 to mitigate the issue.
References
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Vulnerability from fkie_nvd
Published
2017-12-22 14:29
Modified
2025-04-20 01:37
Severity ?
Summary
H2O version 2.2.2 and earlier allows remote attackers to cause a denial of service in the server via specially crafted HTTP/1 header.
References
| ▶ | URL | Tags | |
|---|---|---|---|
| vultures@jpcert.or.jp | https://github.com/h2o/h2o/issues/1459 | Third Party Advisory | |
| vultures@jpcert.or.jp | https://jvn.jp/en/jp/JVN84182676/index.html | Third Party Advisory, VDB Entry | |
| af854a3a-2127-422b-91ae-364da2661108 | https://github.com/h2o/h2o/issues/1459 | Third Party Advisory | |
| af854a3a-2127-422b-91ae-364da2661108 | https://jvn.jp/en/jp/JVN84182676/index.html | Third Party Advisory, VDB Entry |
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Vulnerability from fkie_nvd
Published
2024-10-11 15:15
Modified
2024-11-12 20:14
Severity ?
5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. When an HTTP request using TLS/1.3 early data on top of TCP Fast Open or QUIC 0-RTT packets is received and the IP-address-based access control is used, the access control does not detect and prohibit HTTP requests conveyed by packets with a spoofed source address. This behavior allows attackers on the network to execute HTTP requests from addresses that are otherwise rejected by the address-based access control. The vulnerability has been addressed in commit 15ed15a. Users may disable the use of TCP FastOpen and QUIC to mitigate the issue.
References
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Vulnerability from fkie_nvd
Published
2023-04-27 15:15
Modified
2024-11-21 08:00
Severity ?
8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Summary
H2O is an HTTP server. In versions 2.3.0-beta2 and prior, when the reverse proxy handler tries to processes a certain type of invalid HTTP request, it tries to build an upstream URL by reading from uninitialized pointer. This behavior can lead to crashes or leak of information to back end HTTP servers. Pull request number 3229 fixes the issue. The pull request has been merged to the `master` branch in commit f010336. Users should upgrade to commit f010336 or later.
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Vulnerability from fkie_nvd
Published
2017-06-09 16:29
Modified
2025-04-20 01:37
Severity ?
Summary
Use-after-free vulnerability in H2O allows remote attackers to cause a denial-of-service (DoS) or obtain server certificate private keys and possibly other information.
References
| ▶ | URL | Tags | |
|---|---|---|---|
| vultures@jpcert.or.jp | http://www.securityfocus.com/bid/95061 | Third Party Advisory, VDB Entry | |
| vultures@jpcert.or.jp | https://github.com/h2o/h2o/issues/1144 | Patch, Third Party Advisory | |
| vultures@jpcert.or.jp | https://jvn.jp/en/jp/JVN44566208/index.html | Third Party Advisory, VDB Entry | |
| af854a3a-2127-422b-91ae-364da2661108 | http://www.securityfocus.com/bid/95061 | Third Party Advisory, VDB Entry | |
| af854a3a-2127-422b-91ae-364da2661108 | https://github.com/h2o/h2o/issues/1144 | Patch, Third Party Advisory | |
| af854a3a-2127-422b-91ae-364da2661108 | https://jvn.jp/en/jp/JVN44566208/index.html | Third Party Advisory, VDB Entry |
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| dena | h2o | * | |
| h2o_project | h2o | 2.1.0 |
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Vulnerability from fkie_nvd
Published
2017-12-22 14:29
Modified
2025-04-20 01:37
Severity ?
Summary
H2O version 2.2.3 and earlier allows remote attackers to cause a denial of service in the server via unspecified vectors.
References
| ▶ | URL | Tags | |
|---|---|---|---|
| vultures@jpcert.or.jp | https://github.com/h2o/h2o/issues/1543 | Third Party Advisory | |
| vultures@jpcert.or.jp | https://jvn.jp/en/jp/JVN84182676/index.html | Third Party Advisory, VDB Entry | |
| af854a3a-2127-422b-91ae-364da2661108 | https://github.com/h2o/h2o/issues/1543 | Third Party Advisory | |
| af854a3a-2127-422b-91ae-364da2661108 | https://jvn.jp/en/jp/JVN84182676/index.html | Third Party Advisory, VDB Entry |
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Vulnerability from fkie_nvd
Published
2023-10-10 14:15
Modified
2025-06-11 17:29
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.
References
Impacted products
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{
"lang": "en",
"value": "The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023."
},
{
"lang": "es",
"value": "El protocolo HTTP/2 permite una denegaci\u00f3n de servicio (consumo de recursos del servidor) porque la cancelaci\u00f3n de solicitudes puede restablecer muchas transmisiones r\u00e1pidamente, como se explot\u00f3 en la naturaleza entre agosto y octubre de 2023."
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},
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},
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},
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},
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},
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},
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"url": "https://www.haproxy.com/blog/haproxy-is-not-affected-by-the-http-2-rapid-reset-attack-cve-2023-44487"
},
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"url": "https://www.netlify.com/blog/netlify-successfully-mitigates-cve-2023-44487/"
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"tags": [
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"url": "https://www.nginx.com/blog/http-2-rapid-reset-attack-impacting-f5-nginx-products/"
},
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"url": "https://www.openwall.com/lists/oss-security/2023/10/10/6"
},
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"url": "https://www.vicarius.io/vsociety/posts/rapid-reset-cve-2023-44487-dos-in-http2-understanding-the-root-cause"
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Vulnerability from fkie_nvd
Published
2024-10-11 15:15
Modified
2024-11-12 20:04
Severity ?
3.1 (Low) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
4.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
4.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. The configuration directives provided by the headers handler allows users to modify the response headers being sent by h2o. The configuration file of h2o has scopes, and the inner scopes (e.g., path level) are expected to inherit the configuration defined in outer scopes (e.g., global level). However, if a header directive is used in the inner scope, all the definition in outer scopes are ignored. This can lead to headers not being modified as expected. Depending on the headers being added or removed unexpectedly, this behavior could lead to unexpected client behavior. This vulnerability is fixed in commit 123f5e2b65dcdba8f7ef659a00d24bd1249141be.
References
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},
{
"lang": "es",
"value": "h2o es un servidor HTTP compatible con HTTP/1.x, HTTP/2 y HTTP/3. Las directivas de configuraci\u00f3n proporcionadas por el controlador de encabezados permiten a los usuarios modificar los encabezados de respuesta que env\u00eda h2o. El archivo de configuraci\u00f3n de h2o tiene \u00e1mbitos y se espera que los \u00e1mbitos internos (por ejemplo, nivel de ruta) hereden la configuraci\u00f3n definida en los \u00e1mbitos externos (por ejemplo, nivel global). Sin embargo, si se utiliza una directiva de encabezado en el \u00e1mbito interno, se ignoran todas las definiciones en los \u00e1mbitos externos. Esto puede provocar que los encabezados no se modifiquen como se esperaba. Seg\u00fan si los encabezados se agregan o eliminan inesperadamente, este comportamiento podr\u00eda provocar un comportamiento inesperado del cliente. Esta vulnerabilidad se corrigi\u00f3 en el commit 123f5e2b65dcdba8f7ef659a00d24bd1249141be."
}
],
"id": "CVE-2024-25622",
"lastModified": "2024-11-12T20:04:39.957",
"metrics": {
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"published": "2024-10-11T15:15:03.947",
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"vulnStatus": "Analyzed",
"weaknesses": [
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"value": "CWE-670"
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],
"source": "security-advisories@github.com",
"type": "Secondary"
},
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{
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"value": "CWE-670"
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"source": "nvd@nist.gov",
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}
Vulnerability from fkie_nvd
Published
2017-05-12 18:29
Modified
2025-04-20 01:37
Severity ?
Summary
H2O versions 2.0.3 and earlier and 2.1.0-beta2 and earlier allows remote attackers to cause a denial-of-service (DoS) via format string specifiers in a template file via fastcgi, mruby, proxy, redirect or reproxy.
References
| ▶ | URL | Tags | |
|---|---|---|---|
| vultures@jpcert.or.jp | https://github.com/h2o/h2o/issues/1077 | Patch, Third Party Advisory | |
| vultures@jpcert.or.jp | https://jvn.jp/en/jp/JVN94779084/index.html | Third Party Advisory, VDB Entry | |
| af854a3a-2127-422b-91ae-364da2661108 | https://github.com/h2o/h2o/issues/1077 | Patch, Third Party Advisory | |
| af854a3a-2127-422b-91ae-364da2661108 | https://jvn.jp/en/jp/JVN94779084/index.html | Third Party Advisory, VDB Entry |
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},
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],
"id": "CVE-2016-4864",
"lastModified": "2025-04-20T01:37:25.860",
"metrics": {
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"baseScore": 5.0,
"confidentialityImpact": "NONE",
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"vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
"version": "2.0"
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"obtainAllPrivilege": false,
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"scope": "UNCHANGED",
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"tags": [
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],
"url": "https://github.com/h2o/h2o/issues/1077"
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Vulnerability from fkie_nvd
Published
2016-06-19 01:59
Modified
2025-04-12 10:46
Severity ?
Summary
lib/http2/connection.c in H2O before 1.7.3 and 2.x before 2.0.0-beta5 mishandles HTTP/2 disconnection, which allows remote attackers to cause a denial of service (use-after-free and application crash) or possibly execute arbitrary code via a crafted packet.
References
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Vulnerability from fkie_nvd
Published
2023-12-12 20:15
Modified
2024-11-21 08:36
Severity ?
3.7 (Low) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. The QUIC stack (quicly), as used by H2O up to commit 43f86e5 (in version 2.3.0-beta and prior), is susceptible to a state exhaustion attack. When H2O is serving HTTP/3, a remote attacker can exploit this vulnerability to progressively increase the memory retained by the QUIC stack. This can eventually cause H2O to abort due to memory exhaustion. The vulnerability has been resolved in commit d67e81d03be12a9d53dc8271af6530f40164cd35. HTTP/1 and HTTP/2 are not affected by this vulnerability as they do not use QUIC. Administrators looking to mitigate this issue without upgrading can disable HTTP/3 support.
References
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Vulnerability from fkie_nvd
Published
2018-06-26 14:29
Modified
2024-11-21 03:38
Severity ?
Summary
Buffer overflow in H2O version 2.2.4 and earlier allows remote attackers to execute arbitrary code or cause a denial of service (DoS) via unspecified vectors.
References
| ▶ | URL | Tags | |
|---|---|---|---|
| vultures@jpcert.or.jp | http://jvn.jp/en/jp/JVN93226941/index.html | Third Party Advisory | |
| vultures@jpcert.or.jp | https://github.com/h2o/h2o/issues/1775 | Third Party Advisory | |
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| af854a3a-2127-422b-91ae-364da2661108 | https://github.com/h2o/h2o/issues/1775 | Third Party Advisory |
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Vulnerability from fkie_nvd
Published
2017-12-22 14:29
Modified
2025-04-20 01:37
Severity ?
Summary
H2O version 2.2.3 and earlier allows remote attackers to cause a denial of service in the server via specially crafted HTTP/2 header.
References
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|---|---|---|---|
| vultures@jpcert.or.jp | https://github.com/h2o/h2o/issues/1544 | Third Party Advisory | |
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Vulnerability from fkie_nvd
Published
2023-12-12 20:15
Modified
2024-11-21 08:21
Severity ?
6.1 (Medium) - CVSS:3.1/AV:A/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
6.7 (Medium) - CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
6.7 (Medium) - CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. In version 2.3.0-beta2 and prior, when h2o is configured to listen to multiple addresses or ports with each of them using different backend servers managed by multiple entities, a malicious backend entity that also has the opportunity to observe or inject packets exchanged between the client and h2o may misdirect HTTPS requests going to other backends and observe the contents of that HTTPS request being sent.
The attack involves a victim client trying to resume a TLS connection and an attacker redirecting the packets to a different address or port than that intended by the client. The attacker must already have been configured by the administrator of h2o to act as a backend to one of the addresses or ports that the h2o instance listens to. Session IDs and tickets generated by h2o are not bound to information specific to the server address, port, or the X.509 certificate, and therefore it is possible for an attacker to force the victim connection to wrongfully resume against a different server address or port on which the same h2o instance is listening.
Once a TLS session is misdirected to resume to a server address / port that is configured to use an attacker-controlled server as the backend, depending on the configuration, HTTPS requests from the victim client may be forwarded to the attacker's server.
An H2O instance is vulnerable to this attack only if the instance is configured to listen to different addresses or ports using the listen directive at the host level and the instance is configured to connect to backend servers managed by multiple entities.
A patch is available at commit 35760540337a47e5150da0f4a66a609fad2ef0ab. As a workaround, one may stop using using host-level listen directives in favor of global-level ones.
References
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CVE-2016-7835 (GCVE-0-2016-7835)
Vulnerability from cvelistv5
Published
2017-06-09 16:00
Modified
2024-08-06 02:04
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Use-after-free
Summary
Use-after-free vulnerability in H2O allows remote attackers to cause a denial-of-service (DoS) or obtain server certificate private keys and possibly other information.
References
| ► | URL | Tags | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Kazuho Oku | H2O |
Version: version 2.0.4 and earlier |
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CVE-2023-30847 (GCVE-0-2023-30847)
Vulnerability from cvelistv5
Published
2023-04-27 14:08
Modified
2025-01-30 19:51
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-824 - Access of Uninitialized Pointer
Summary
H2O is an HTTP server. In versions 2.3.0-beta2 and prior, when the reverse proxy handler tries to processes a certain type of invalid HTTP request, it tries to build an upstream URL by reading from uninitialized pointer. This behavior can lead to crashes or leak of information to back end HTTP servers. Pull request number 3229 fixes the issue. The pull request has been merged to the `master` branch in commit f010336. Users should upgrade to commit f010336 or later.
References
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CVE-2017-10908 (GCVE-0-2017-10908)
Vulnerability from cvelistv5
Published
2017-12-22 14:00
Modified
2024-08-05 17:50
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Denial-of-service (DoS)
Summary
H2O version 2.2.3 and earlier allows remote attackers to cause a denial of service in the server via specially crafted HTTP/2 header.
References
| ► | URL | Tags | ||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Kazuho Oku | H2O |
Version: version 2.2.3 and earlier |
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CVE-2018-0608 (GCVE-0-2018-0608)
Vulnerability from cvelistv5
Published
2018-06-26 14:00
Modified
2024-08-05 03:28
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Buffer Overflow
Summary
Buffer overflow in H2O version 2.2.4 and earlier allows remote attackers to execute arbitrary code or cause a denial of service (DoS) via unspecified vectors.
References
| ► | URL | Tags | ||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Kazuho Oku | H2O |
Version: version 2.2.4 and earlier |
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CVE-2017-10868 (GCVE-0-2017-10868)
Vulnerability from cvelistv5
Published
2017-12-22 14:00
Modified
2024-08-05 17:50
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Denial-of-service (DoS)
Summary
H2O version 2.2.2 and earlier allows remote attackers to cause a denial of service in the server via specially crafted HTTP/1 header.
References
| ► | URL | Tags | ||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Kazuho Oku | H2O |
Version: version 2.2.2 and earlier |
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CVE-2017-10872 (GCVE-0-2017-10872)
Vulnerability from cvelistv5
Published
2017-12-22 14:00
Modified
2024-08-05 17:50
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Denial-of-service (DoS)
Summary
H2O version 2.2.3 and earlier allows remote attackers to cause a denial of service in the server via unspecified vectors.
References
| ► | URL | Tags | ||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Kazuho Oku | H2O |
Version: version 2.2.3 and earlier |
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CVE-2021-43848 (GCVE-0-2021-43848)
Vulnerability from cvelistv5
Published
2022-02-01 12:13
Modified
2025-04-23 19:08
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-908 - Use of Uninitialized Resource
Summary
h2o is an open source http server. In code prior to the `8c0eca3` commit h2o may attempt to access uninitialized memory. When receiving QUIC frames in certain order, HTTP/3 server-side implementation of h2o can be misguided to treat uninitialized memory as HTTP/3 frames that have been received. When h2o is used as a reverse proxy, an attacker can abuse this vulnerability to send internal state of h2o to backend servers controlled by the attacker or third party. Also, if there is an HTTP endpoint that reflects the traffic sent from the client, an attacker can use that reflector to obtain internal state of h2o. This internal state includes traffic of other connections in unencrypted form and TLS session tickets. This vulnerability exists in h2o server with HTTP/3 support, between commit 93af138 and d1f0f65. None of the released versions of h2o are affected by this vulnerability. There are no known workarounds. Users of unreleased versions of h2o using HTTP/3 are advised to upgrade immediately.
References
| ► | URL | Tags | ||||||
|---|---|---|---|---|---|---|---|---|
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CVE-2016-4864 (GCVE-0-2016-4864)
Vulnerability from cvelistv5
Published
2017-05-12 18:00
Modified
2024-08-06 00:46
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Format String Vulnerability
Summary
H2O versions 2.0.3 and earlier and 2.1.0-beta2 and earlier allows remote attackers to cause a denial-of-service (DoS) via format string specifiers in a template file via fastcgi, mruby, proxy, redirect or reproxy.
References
| ► | URL | Tags | ||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Kazuho Oku | H2O |
Version: versions 2.0.3 and earlier Version: versions 2.1.0-beta2 and earlier |
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CVE-2023-44487 (GCVE-0-2023-44487)
Vulnerability from cvelistv5
Published
2023-10-10 00:00
Modified
2025-07-30 01:37
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.
References
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{
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},
{
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{
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},
{
"name": "[debian-lts-announce] 20231105 [SECURITY] [DLA 3645-1] trafficserver security update",
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CVE-2016-1133 (GCVE-0-2016-1133)
Vulnerability from cvelistv5
Published
2016-01-16 02:00
Modified
2024-08-05 22:48
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
CRLF injection vulnerability in the on_req function in lib/handler/redirect.c in H2O before 1.6.2 and 1.7.x before 1.7.0-beta3 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via a crafted URI.
References
| ► | URL | Tags | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
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CVE-2024-45403 (GCVE-0-2024-45403)
Vulnerability from cvelistv5
Published
2024-10-11 14:28
Modified
2024-10-11 14:40
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-617 - Reachable Assertion
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. When h2o is configured as a reverse proxy and HTTP/3 requests are cancelled by the client, h2o might crash due to an assertion failure. The crash can be exploited by an attacker to mount a Denial-of-Service attack. By default, the h2o standalone server automatically restarts, minimizing the impact. However, HTTP requests that were served concurrently will still be disrupted. The vulnerability has been addressed in commit 1ed32b2. Users may disable the use of HTTP/3 to mitigate the issue.
References
| ► | URL | Tags | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
Impacted products
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CVE-2017-10869 (GCVE-0-2017-10869)
Vulnerability from cvelistv5
Published
2017-12-22 14:00
Modified
2024-08-05 17:50
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Buffer Overflow
Summary
Buffer overflow in H2O version 2.2.2 and earlier allows remote attackers to cause a denial-of-service in the server via unspecified vectors.
References
| ► | URL | Tags | ||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Kazuho Oku | H2O |
Version: version 2.2.2 and earlier |
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CVE-2024-45397 (GCVE-0-2024-45397)
Vulnerability from cvelistv5
Published
2024-10-11 14:24
Modified
2024-10-11 14:42
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-284 - Improper Access Control
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. When an HTTP request using TLS/1.3 early data on top of TCP Fast Open or QUIC 0-RTT packets is received and the IP-address-based access control is used, the access control does not detect and prohibit HTTP requests conveyed by packets with a spoofed source address. This behavior allows attackers on the network to execute HTTP requests from addresses that are otherwise rejected by the address-based access control. The vulnerability has been addressed in commit 15ed15a. Users may disable the use of TCP FastOpen and QUIC to mitigate the issue.
References
| ► | URL | Tags | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
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Impacted products
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CVE-2023-41337 (GCVE-0-2023-41337)
Vulnerability from cvelistv5
Published
2023-12-12 19:42
Modified
2024-08-02 19:01
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. In version 2.3.0-beta2 and prior, when h2o is configured to listen to multiple addresses or ports with each of them using different backend servers managed by multiple entities, a malicious backend entity that also has the opportunity to observe or inject packets exchanged between the client and h2o may misdirect HTTPS requests going to other backends and observe the contents of that HTTPS request being sent.
The attack involves a victim client trying to resume a TLS connection and an attacker redirecting the packets to a different address or port than that intended by the client. The attacker must already have been configured by the administrator of h2o to act as a backend to one of the addresses or ports that the h2o instance listens to. Session IDs and tickets generated by h2o are not bound to information specific to the server address, port, or the X.509 certificate, and therefore it is possible for an attacker to force the victim connection to wrongfully resume against a different server address or port on which the same h2o instance is listening.
Once a TLS session is misdirected to resume to a server address / port that is configured to use an attacker-controlled server as the backend, depending on the configuration, HTTPS requests from the victim client may be forwarded to the attacker's server.
An H2O instance is vulnerable to this attack only if the instance is configured to listen to different addresses or ports using the listen directive at the host level and the instance is configured to connect to backend servers managed by multiple entities.
A patch is available at commit 35760540337a47e5150da0f4a66a609fad2ef0ab. As a workaround, one may stop using using host-level listen directives in favor of global-level ones.
References
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|---|---|---|---|---|---|---|---|---|
|
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CVE-2024-25622 (GCVE-0-2024-25622)
Vulnerability from cvelistv5
Published
2024-10-11 14:20
Modified
2024-10-11 14:46
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-670 - Always-Incorrect Control Flow Implementation
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. The configuration directives provided by the headers handler allows users to modify the response headers being sent by h2o. The configuration file of h2o has scopes, and the inner scopes (e.g., path level) are expected to inherit the configuration defined in outer scopes (e.g., global level). However, if a header directive is used in the inner scope, all the definition in outer scopes are ignored. This can lead to headers not being modified as expected. Depending on the headers being added or removed unexpectedly, this behavior could lead to unexpected client behavior. This vulnerability is fixed in commit 123f5e2b65dcdba8f7ef659a00d24bd1249141be.
References
| ► | URL | Tags | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
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Impacted products
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CVE-2023-50247 (GCVE-0-2023-50247)
Vulnerability from cvelistv5
Published
2023-12-12 19:56
Modified
2024-08-02 22:09
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. The QUIC stack (quicly), as used by H2O up to commit 43f86e5 (in version 2.3.0-beta and prior), is susceptible to a state exhaustion attack. When H2O is serving HTTP/3, a remote attacker can exploit this vulnerability to progressively increase the memory retained by the QUIC stack. This can eventually cause H2O to abort due to memory exhaustion. The vulnerability has been resolved in commit d67e81d03be12a9d53dc8271af6530f40164cd35. HTTP/1 and HTTP/2 are not affected by this vulnerability as they do not use QUIC. Administrators looking to mitigate this issue without upgrading can disable HTTP/3 support.
References
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CVE-2016-4817 (GCVE-0-2016-4817)
Vulnerability from cvelistv5
Published
2016-06-19 01:00
Modified
2024-08-06 00:39
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
lib/http2/connection.c in H2O before 1.7.3 and 2.x before 2.0.0-beta5 mishandles HTTP/2 disconnection, which allows remote attackers to cause a denial of service (use-after-free and application crash) or possibly execute arbitrary code via a crafted packet.
References
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