rhsa-2021_4513
Vulnerability from csaf_redhat
Published
2021-11-09 18:30
Modified
2024-11-06 00:08
Summary
Red Hat Security Advisory: libsepol security update
Notes
Topic
An update for libsepol is now available for Red Hat Enterprise Linux 8.
Red Hat Product Security has rated this update as having a security impact of Moderate. 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
The libsepol library provides an API for the manipulation of SELinux binary policies. It is used by checkpolicy (the policy compiler) and similar tools, as well as by programs like load_policy that need to perform specific transformations on binary policies (for example, customizing policy boolean settings).
Security Fix(es):
* libsepol: use-after-free in __cil_verify_classperms() (CVE-2021-36084)
* libsepol: use-after-free in __cil_verify_classperms() (CVE-2021-36085)
* libsepol: use-after-free in cil_reset_classpermission() (CVE-2021-36086)
* libsepol: heap-based buffer overflow in ebitmap_match_any() (CVE-2021-36087)
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.
Additional Changes:
For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.5 Release Notes linked from 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": "The CIL compiler in SELinux 3.2 has a use-after-free in __cil_verify_classperms (called from __cil_verify_classpermission and __cil_pre_verify_helper).",
"title": "Vulnerability description"
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"text": "libsepol: use-after-free in __cil_verify_classperms()",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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{
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"baseSeverity": "LOW",
"confidentialityImpact": "NONE",
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"title": "libsepol: use-after-free in __cil_verify_classperms()"
},
{
"cve": "CVE-2021-36085",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
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"discovery_date": "2021-07-01T00:00:00+00:00",
"ids": [
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{
"category": "description",
"text": "The CIL compiler in SELinux 3.2 has a use-after-free in __cil_verify_classperms (called from __verify_map_perm_classperms and hashtab_map).",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "libsepol: use-after-free in __cil_verify_classperms()",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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}
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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "LOW",
"baseScore": 3.3,
"baseSeverity": "LOW",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
"version": "3.1"
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "libsepol: use-after-free in __cil_verify_classperms()"
},
{
"cve": "CVE-2021-36086",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
},
"discovery_date": "2021-07-01T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1979666"
}
],
"notes": [
{
"category": "description",
"text": "The CIL compiler in SELinux 3.2 has a use-after-free in cil_reset_classpermission (called from cil_reset_classperms_set and cil_reset_classperms_list).",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "libsepol: use-after-free in cil_reset_classpermission()",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2021-36086"
},
{
"category": "external",
"summary": "RHBZ#1979666",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1979666"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2021-36086",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-36086"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-36086",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-36086"
}
],
"release_date": "2021-04-19T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2021-11-09T18:30:20+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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"title": "libsepol: use-after-free in cil_reset_classpermission()"
},
{
"cve": "CVE-2021-36087",
"cwe": {
"id": "CWE-119",
"name": "Improper Restriction of Operations within the Bounds of a Memory Buffer"
},
"discovery_date": "2021-07-01T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1979668"
}
],
"notes": [
{
"category": "description",
"text": "The CIL compiler in SELinux 3.2 has a heap-based buffer over-read in ebitmap_match_any (called indirectly from cil_check_neverallow). This occurs because there is sometimes a lack of checks for invalid statements in an optional block.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "libsepol: heap-based buffer overflow in ebitmap_match_any()",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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},
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"category": "external",
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{
"category": "external",
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"url": "https://www.cve.org/CVERecord?id=CVE-2021-36087"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-36087",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-36087"
}
],
"release_date": "2021-04-19T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2021-11-09T18:30:20+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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]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "libsepol: heap-based buffer overflow in ebitmap_match_any()"
}
]
}
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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.