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CVE-2021-36087

Published: 1 July 2021

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.

Notes

AuthorNote
sbeattie
AppArmor is the default LSM in Ubuntu, issue only affects
compilation of selinux policy
trusty version predates the introduction of CIL

Priority

Low

Cvss 3 Severity Score

3.3

Score breakdown

Status

Package Release Status
libsepol
Launchpad, Ubuntu, Debian
bionic
Released (2.7-1ubuntu0.1)
focal
Released (3.0-1ubuntu0.1)
impish
Released (3.1-1ubuntu2.1)
jammy Not vulnerable
(3.3-1)
xenial
Released (2.4-2ubuntu0.1~esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
groovy Ignored
(end of life)
hirsute Ignored
(end of life)
trusty Not vulnerable
(code not present)
upstream
Released (3.3-1)
Patches:
upstream: https://github.com/SELinuxProject/selinux/commit/bad0a746e9f4cf260dedba5828d9645d50176aac

Severity score breakdown

Parameter Value
Base score 3.3
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact Low
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L