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
(reached end-of-life)
|
|
| hirsute |
Ignored
(reached 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)
|
|
|
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 |