Summary
Florian Weimer discovered that shadow was not properly copying and removing
user directory trees, which could lead to a race condition. A local attacker
could possibly use this issue to setup a symlink attack and alter or remove
directories without authorization.
Fixed packages 5
| Release | Package | Fixed in |
|---|---|---|
| Ubuntu · 18.04 LTS 18.04:LTS | shadow | 1:4.5-1ubuntu2.4 |
| Ubuntu · 20.04 LTS 20.04:LTS | shadow | 1:4.8.1-1ubuntu5.20.04.3 |
| Ubuntu · 22.04 LTS 22.04:LTS | shadow | 1:4.8.1-2ubuntu2.1 |
| Ubuntu · Pro 14.04 LTS Pro:14.04:LTS | shadow | 1:4.1.5.1-1ubuntu9.5+esm2 |
| Ubuntu · Pro 16.04 LTS Pro:16.04:LTS | shadow | 1:4.2-3.1ubuntu5.5+esm2 |
Vulnerabilities 1
-
Unscored —
shadow: TOCTOU (time-of-check time-of-use) race condition when copying and removing directory trees
References
-
report
https://ubuntu.com/security/CVE-2013-4235