USN-5745-1: shadow vulnerability

Releases

• Ubuntu 22.10
• Ubuntu 22.04 LTS
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM

Packages

• shadow - system login tools

Details

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.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 22.10

• passwd - 1:4.11.1+dfsg1-2ubuntu1.1
• login - 1:4.11.1+dfsg1-2ubuntu1.1
• libsubid4 - 1:4.11.1+dfsg1-2ubuntu1.1
• uidmap - 1:4.11.1+dfsg1-2ubuntu1.1

Ubuntu 22.04

• passwd - 1:4.8.1-2ubuntu2.1
• login - 1:4.8.1-2ubuntu2.1
• uidmap - 1:4.8.1-2ubuntu2.1

Ubuntu 20.04

• passwd - 1:4.8.1-1ubuntu5.20.04.3
• login - 1:4.8.1-1ubuntu5.20.04.3
• uidmap - 1:4.8.1-1ubuntu5.20.04.3

Ubuntu 18.04

• passwd - 1:4.5-1ubuntu2.4
• login - 1:4.5-1ubuntu2.4
• uidmap - 1:4.5-1ubuntu2.4

Ubuntu 16.04

• passwd - 1:4.2-3.1ubuntu5.5+esm2
  Available with Ubuntu Pro
• login - 1:4.2-3.1ubuntu5.5+esm2
  Available with Ubuntu Pro
• uidmap - 1:4.2-3.1ubuntu5.5+esm2
  Available with Ubuntu Pro

Ubuntu 14.04

• passwd - 1:4.1.5.1-1ubuntu9.5+esm2
  Available with Ubuntu Pro
• login - 1:4.1.5.1-1ubuntu9.5+esm2
  Available with Ubuntu Pro
• uidmap - 1:4.1.5.1-1ubuntu9.5+esm2
  Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References

• CVE-2013-4235