CVE-2021-36085
Published: 1 July 2021
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).
From the Ubuntu Security Team
sbeattie> AppArmor is the default LSM in Ubuntu, issue only affects compilation of selinux policy sbeattie> trusty version predates the introduction of CIL
Priority
Status
Package | Release | Status |
---|---|---|
libsepol
Launchpad, Ubuntu, Debian |
bionic |
Released
(2.7-1ubuntu0.1)
|
focal |
Released
(3.0-1ubuntu0.1)
|
|
groovy |
Ignored
(end of life)
|
|
hirsute |
Ignored
(end of life)
|
|
impish |
Released
(3.1-1ubuntu2.1)
|
|
jammy |
Not vulnerable
(3.3-1)
|
|
trusty |
Not vulnerable
(code not present)
|
|
upstream |
Released
(3.3-1)
|
|
xenial |
Released
(2.4-2ubuntu0.1~esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
Patches:
upstream: https://github.com/SELinuxProject/selinux/commit/2d35fcc7e9e976a2346b1de20e54f8663e8a6cba |
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 |