rhsa-2025:8677
Vulnerability from csaf_redhat
Published
2025-06-09 14:03
Modified
2025-08-06 05:24
Summary
Red Hat Security Advisory: perl-FCGI security update
Notes
Topic
An update for perl-FCGI is now available for Red Hat Enterprise Linux 9.4 Extended Update Support.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
FastCGI Perl bindings.
Security Fix(es):
* perl-fcgi: FCGI versions 0.44 through 0.82, for Perl, include a vulnerable version of the FastCGI fcgi2 (aka fcgi) library (CVE-2025-40907)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
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"text": "A flaw was found in the FCGI library. In affected versions, specially crafted nameLen or valueLen values in data sent to the IPC socket may result in a heap-based buffer overflow, which can cause an application crash or other undefined behavior. This occurs in ReadParams in fcgiapp.c.",
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"text": "This vulnerability is Important rather than just a Moderate flaw because it stems from an integer overflow in the allocation size calculation during parameter parsing in the FastCGI implementation. When the application processes incoming FastCGI parameters, it calculates the total size of memory to allocate by adding the name and value lengths along with two additional bytes. On 32-bit systems, this arithmetic operation can wrap around (due to the limited 32-bit size of size_t), leading to a significantly smaller allocation than intended. However, subsequent calls to FCGX_GetStr use the original (large) lengths provided by the attacker and write far beyond the allocated memory region (heap overflow). Unlike a moderate vulnerability (e.g., memory leak or a simple read out-of-bounds), this heap overflow directly allows an attacker to overwrite adjacent memory in the heap in a controlled way, potentially leading to arbitrary code execution, data corruption, or privilege escalation.",
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"url": "https://www.cve.org/CVERecord?id=CVE-2025-40907"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-40907",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40907"
},
{
"category": "external",
"summary": "http://www.openwall.com/lists/oss-security/2025/04/23/4",
"url": "http://www.openwall.com/lists/oss-security/2025/04/23/4"
},
{
"category": "external",
"summary": "https://github.com/FastCGI-Archives/fcgi2/issues/67",
"url": "https://github.com/FastCGI-Archives/fcgi2/issues/67"
},
{
"category": "external",
"summary": "https://github.com/FastCGI-Archives/fcgi2/releases/tag/2.4.5",
"url": "https://github.com/FastCGI-Archives/fcgi2/releases/tag/2.4.5"
},
{
"category": "external",
"summary": "https://github.com/perl-catalyst/FCGI/issues/14",
"url": "https://github.com/perl-catalyst/FCGI/issues/14"
},
{
"category": "external",
"summary": "https://patch-diff.githubusercontent.com/raw/FastCGI-Archives/fcgi2/pull/74.patch",
"url": "https://patch-diff.githubusercontent.com/raw/FastCGI-Archives/fcgi2/pull/74.patch"
},
{
"category": "external",
"summary": "https://www.synacktiv.com/en/publications/cve-2025-23016-exploiting-the-fastcgi-library",
"url": "https://www.synacktiv.com/en/publications/cve-2025-23016-exploiting-the-fastcgi-library"
}
],
"release_date": "2025-05-16T13:03:02.774000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2025-06-09T14:03:04+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2025:8677"
},
{
"category": "workaround",
"details": "No mitigation is currently available that meets Red Hat Product Security\u2019s standards for usability, deployment, applicability, or stability.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "perl-fcgi: FCGI versions 0.44 through 0.82, for Perl, include a vulnerable version of the FastCGI fcgi2 (aka fcgi) library"
}
]
}
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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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