CVE-2021-23177
Published: 24 December 2021
An improper link resolution flaw while extracting an archive can lead to changing the access control list (ACL) of the target of the link. An attacker may provide a malicious archive to a victim user, who would trigger this flaw when trying to extract the archive. A local attacker may use this flaw to change the ACL of a file on the system and gain more privileges.
Notes
| Author | Note |
|---|---|
| mdeslaur | intrusive backport to bionic |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
libarchive Launchpad, Ubuntu, Debian |
bionic |
Needed
|
| trusty |
Needs triage
|
|
| upstream |
Released
(3.5.2-1)
|
|
| xenial |
Needs triage
|
|
| focal |
Released
(3.4.0-2ubuntu1.1)
|
|
| impish |
Released
(3.4.3-2ubuntu0.1)
|
|
| hirsute |
Ignored
(end of life)
|
|
| jammy |
Not vulnerable
(3.5.2-1)
|
|
| kinetic |
Not vulnerable
(3.5.2-1)
|
|
| lunar |
Not vulnerable
(3.5.2-1)
|
|
| mantic |
Not vulnerable
(3.5.2-1)
|
|
|
Patches: upstream: https://github.com/libarchive/libarchive/commit/fba4f123cc456d2b2538f811bb831483bf336bad (v3.5.2) |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.8 |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | Required |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |