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Ubuntu 20.04 LTS USN-5745-2 Moderate: Shadow Regression Issue

ubuntu
Calendar Grey November 29, 2022
Dist Ubuntu Esm H88
The impact of USN-5745-2 affects many Ubuntu distributions, highlighting a significant regression in system security and operational integrity urging users to update their systems quickly
USN-5745-1 introduced a regression in shadow.

Summary

USN-5745-1 introduced a regression in shadow.

Software Description:

- shadow: system login tools

Details:

USN-5745-1 fixed vulnerabilities in shadow. Unfortunately that update

introduced a regression that caused useradd to behave incorrectly in Ubuntu

14.04 ESM, Ubuntu 16.04 ESM, Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. This

update reverts the security fix pending further investigation.

We apologize for the inconvenience.

Original advisory 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.

Topics%20covered

Topics Covered

security advisory security issue update Ubuntu shadow regression system login

Update Instructions

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

Ubuntu 20.04 LTS:
   login                           1:4.8.1-1ubuntu5.20.04.4
   passwd                          1:4.8.1-1ubuntu5.20.04.4
   uidmap                          1:4.8.1-1ubuntu5.20.04.4

Ubuntu 18.04 LTS:
   login                           1:4.5-1ubuntu2.5
   passwd                          1:4.5-1ubuntu2.5
   uidmap                          1:4.5-1ubuntu2.5

Ubuntu 16.04 ESM:
   login                           1:4.2-3.1ubuntu5.5+esm3
   passwd                          1:4.2-3.1ubuntu5.5+esm3
   uidmap                          1:4.2-3.1ubuntu5.5+esm3

Ubuntu 14.04 ESM:
   login                           1:4.1.5.1-1ubuntu9.5+esm3
   passwd                          1:4.1.5.1-1ubuntu9.5+esm3
   uidmap                          1:4.1.5.1-1ubuntu9.5+esm3

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

References

  https://ubuntu.com/security/notices/USN-5745-2

  https://ubuntu.com/security/notices/USN-5745-1

  https://bugs.launchpad.net/ubuntu/+source/shadow/+bug/1998169

November 29, 2022

Topics%20covered

Topics Covered

security advisory security issue update Ubuntu shadow regression system login

Package Information

https://launchpad.net/ubuntu/+source/shadow/1:4.8.1-1ubuntu5.20.04.4
  https://launchpad.net/ubuntu/+source/shadow/1:4.5-1ubuntu2.5

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