CVE-2021-36084
Published: 1 July 2021
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).
Notes
| Author | Note |
|---|---|
| sbeattie | AppArmor is the default LSM in Ubuntu, issue only affects compilation of selinux policy trusty version predates the introduction of CIL |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
libsepol Launchpad, Ubuntu, Debian |
jammy |
Not vulnerable
(3.3-1)
|
| groovy |
Ignored
(end of life)
|
|
| trusty |
Not vulnerable
(code not present)
|
|
| upstream |
Released
(3.3-1)
|
|
| bionic |
Released
(2.7-1ubuntu0.1)
|
|
| focal |
Released
(3.0-1ubuntu0.1)
|
|
| impish |
Released
(3.1-1ubuntu2.1)
|
|
| hirsute |
Ignored
(end of life)
|
|
| xenial |
Released
(2.4-2ubuntu0.1~esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
|
Patches: upstream: https://github.com/SELinuxProject/selinux/commit/f34d3d30c8325e4847a6b696fe7a3936a8a361f3 |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 3.3 |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | Required |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | Low |
| Vector | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L |