CVE-2023-6936 (GCVE-0-2023-6936)
Vulnerability from cvelistv5
Published
2024-02-20 21:52
Modified
2025-03-26 16:28
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In wolfSSL prior to 5.6.6, if callback functions are enabled (via the WOLFSSL_CALLBACKS flag), then a malicious TLS client or network attacker can trigger a buffer over-read on the heap of 5 bytes (WOLFSSL_CALLBACKS is only intended for debugging).
References
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{ "containers": { "adp": [ { "affected": [ { "cpes": [ "cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*" ], "defaultStatus": "unknown", "product": "wolfssl", "vendor": "wolfssl", "versions": [ { "lessThanOrEqual": "5.6.5", "status": "affected", "version": "0", "versionType": "custom" } ] } ], "metrics": [ { "other": { "content": { "id": "CVE-2023-6936", "options": [ { "Exploitation": "none" }, { "Automatable": "yes" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "timestamp": "2024-08-27T14:22:41.353325Z", "version": "2.0.3" }, "type": "ssvc" } } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-126", "description": "CWE-126 Buffer Over-read", "lang": "en", "type": "CWE" } ] } ], "providerMetadata": { "dateUpdated": "2025-03-26T16:28:30.322Z", "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP" }, "title": "CISA ADP Vulnrichment" }, { "providerMetadata": { "dateUpdated": "2024-08-02T08:42:08.671Z", "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE" }, "references": [ { "tags": [ "patch", "x_transferred" ], "url": "https://github.com/wolfSSL/wolfssl/pull/6949/" }, { "tags": [ "vendor-advisory", "x_transferred" ], "url": "https://www.wolfssl.com/docs/security-vulnerabilities/" } ], "title": "CVE Program Container" } ], "cna": { "affected": [ { "defaultStatus": "unaffected", "modules": [ "TLS" ], "product": "wolfSSL", "repo": "https://github.com/wolfSSL/wolfssl", "vendor": "wolfSSL", "versions": [ { "lessThanOrEqual": "5.6.5", "status": "affected", "version": "0", "versionType": "release bundle" } ] } ], "configurations": [ { "lang": "en", "supportingMedia": [ { "base64": false, "type": "text/html", "value": "To be vulnerable, wolfSSL callback functionality (which includes handshake and timeout callback functionality) must must be enabled with:\u003cbr\u003e\u003cb\u003e\u003cspan style=\"background-color: transparent;\"\u003eCFLAGS=\"-DWOLFSSL_CALLBACKS\"\u003c/span\u003e\u003c/b\u003e\u003cbr\u003e\u003cbr\u003eThis option is disabled by default. The default configuration of wolfSSL is not vulnerable." } ], "value": "To be vulnerable, wolfSSL callback functionality (which includes handshake and timeout callback functionality) must must be enabled with:\nCFLAGS=\"-DWOLFSSL_CALLBACKS\"\n\nThis option is disabled by default. The default configuration of wolfSSL is not vulnerable." } ], "credits": [ { "lang": "en", "type": "finder", "user": "00000000-0000-4000-9000-000000000000", "value": "Lucca Hirschi (Inria, LORIA)" }, { "lang": "en", "type": "finder", "user": "00000000-0000-4000-9000-000000000000", "value": "Steve Kremer (Inria, LORIA)" }, { "lang": "en", "type": "finder", "user": "00000000-0000-4000-9000-000000000000", "value": "Max Ammann (Trail of Bits)" }, { "lang": "en", "type": "tool", "user": "00000000-0000-4000-9000-000000000000", "value": "tlspuffin" } ], "datePublic": "2023-12-20T00:00:00.000Z", "descriptions": [ { "lang": "en", "supportingMedia": [ { "base64": false, "type": "text/html", "value": "In wolfSSL prior to 5.6.6, if callback functions are enabled (via the WOLFSSL_CALLBACKS flag), then a malicious TLS client or network attacker can trigger a buffer over-read on the heap of 5 bytes (WOLFSSL_CALLBACKS is only intended for debugging).\u003cbr\u003e" } ], "value": "In wolfSSL prior to 5.6.6, if callback functions are enabled (via the WOLFSSL_CALLBACKS flag), then a malicious TLS client or network attacker can trigger a buffer over-read on the heap of 5 bytes (WOLFSSL_CALLBACKS is only intended for debugging).\n" } ], "metrics": [ { "cvssV3_1": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1" }, "format": "CVSS", "scenarios": [ { "lang": "en", "value": "GENERAL" } ] } ], "providerMetadata": { "dateUpdated": "2024-02-20T21:52:02.441Z", "orgId": "50d2cd11-d01a-48ed-9441-5bfce9d63b27", "shortName": "wolfSSL" }, "references": [ { "tags": [ "patch" ], "url": "https://github.com/wolfSSL/wolfssl/pull/6949/" }, { "tags": [ "vendor-advisory" ], "url": "https://www.wolfssl.com/docs/security-vulnerabilities/" } ], "solutions": [ { "lang": "en", "supportingMedia": [ { "base64": false, "type": "text/html", "value": "\u003cp\u003e\u003cspan style=\"background-color: transparent;\"\u003eThe fix for this issue is located in the following GitHub Pull Request: \u003c/span\u003e\u003ca target=\"_blank\" rel=\"nofollow\" href=\"https://github.com/wolfSSL/wolfssl/pull/6949/\"\u003ehttps://github.com/wolfSSL/wolfssl/pull/6949/\u003c/a\u003e\u003c/p\u003e" } ], "value": "The fix for this issue is located in the following GitHub Pull Request: https://github.com/wolfSSL/wolfssl/pull/6949/ https://github.com/wolfSSL/wolfssl/pull/6949/ \n\n" } ], "source": { "discovery": "EXTERNAL" }, "title": " Heap-buffer over-read with WOLFSSL_CALLBACKS", "workarounds": [ { "lang": "en", "supportingMedia": [ { "base64": false, "type": "text/html", "value": "\u003cli\u003eDo not build wolfSSL with \u003cb\u003eWOLFSSL_CALLBACKS\u003c/b\u003e defined\u003c/li\u003e" } ], "value": " * Do not build wolfSSL with WOLFSSL_CALLBACKS defined\n" } ], "x_generator": { "engine": "Vulnogram 0.1.0-dev" } } }, "cveMetadata": { "assignerOrgId": "50d2cd11-d01a-48ed-9441-5bfce9d63b27", "assignerShortName": "wolfSSL", "cveId": "CVE-2023-6936", "datePublished": "2024-02-20T21:52:02.441Z", "dateReserved": "2023-12-18T22:01:24.437Z", "dateUpdated": "2025-03-26T16:28:30.322Z", "state": "PUBLISHED" }, "dataType": "CVE_RECORD", "dataVersion": "5.1", "vulnerability-lookup:meta": { "nvd": "{\"cve\":{\"id\":\"CVE-2023-6936\",\"sourceIdentifier\":\"facts@wolfssl.com\",\"published\":\"2024-02-20T22:15:08.197\",\"lastModified\":\"2025-03-26T17:15:23.757\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In wolfSSL prior to 5.6.6, if callback functions are enabled (via the WOLFSSL_CALLBACKS flag), then a malicious TLS client or network attacker can trigger a buffer over-read on the heap of 5 bytes (WOLFSSL_CALLBACKS is only intended for debugging).\\n\"},{\"lang\":\"es\",\"value\":\"En wolfSSL anterior a 5.6.6, si las funciones de devoluci\u00f3n de llamada est\u00e1n habilitadas (a trav\u00e9s del indicador WOLFSSL_CALLBACKS), entonces un cliente TLS malicioso o un atacante de red puede desencadenar una sobrelectura del b\u00fafer en el mont\u00f3n de 5 bytes (WOLFSSL_CALLBACKS solo est\u00e1 destinado a la 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The default configuration of wolfSSL is not vulnerable.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"To be vulnerable, wolfSSL callback functionality (which includes handshake and timeout callback functionality) must must be enabled with:\u003cbr\u003e\u003cb\u003e\u003cspan style=\\\"background-color: transparent;\\\"\u003eCFLAGS=\\\"-DWOLFSSL_CALLBACKS\\\"\u003c/span\u003e\u003c/b\u003e\u003cbr\u003e\u003cbr\u003eThis option is disabled by default. 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Sightings
Author | Source | Type | Date |
---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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