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Amazon Linux 2 : libsepol (ALAS-2023-2307)

low Nessus Plugin ID 183473

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Synopsis

The remote Amazon Linux 2 host is missing a security update.

Description

The version of libsepol installed on the remote host is prior to 2.5-10. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2023-2307 advisory.

 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). (CVE-2021-36084)

 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). (CVE-2021-36085)

 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). (CVE-2021-36086)

 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. (CVE-2021-36087)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Run 'yum update libsepol' to update your system.

See Also

https://alas.aws.amazon.com/AL2/ALAS-2023-2307.html

https://alas.aws.amazon.com/cve/html/CVE-2021-36084.html

https://alas.aws.amazon.com/cve/html/CVE-2021-36085.html

https://alas.aws.amazon.com/cve/html/CVE-2021-36086.html

https://alas.aws.amazon.com/cve/html/CVE-2021-36087.html

https://alas.aws.amazon.com/faqs.html

Plugin Details

Severity: Low

ID: 183473

File Name: al2_ALAS-2023-2307.nasl

Version: 1.2

Type: local

Agent: unix

Published: 10/20/2023

Updated: 12/11/2024

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.2

CVSS v2

Risk Factor: Low

Base Score: 2.1

Temporal Score: 1.6

Vector: CVSS2#AV:L/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2021-36087

CVSS v3

Risk Factor: Low

Base Score: 3.3

Temporal Score: 3

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:libsepol-devel, p-cpe:/a:amazon:linux:libsepol-static, cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:libsepol, p-cpe:/a:amazon:linux:libsepol-debuginfo

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 10/12/2023

Vulnerability Publication Date: 7/1/2021

Reference Information

CVE: CVE-2021-36084, CVE-2021-36085, CVE-2021-36086, CVE-2021-36087