USN-6541-2: GNU C Library regression

Releases

• Ubuntu 22.04 LTS

Packages

• glibc - GNU C Library

Details

USN-6541-1 fixed vulnerabilities in the GNU C Library. Unfortunately,
changes made to allow proper application of the fix for CVE-2023-4806 in
Ubuntu 22.04 LTS introduced an issue in the NSCD service IPv6 processing
functionalities. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

It was discovered that the GNU C Library was not properly handling certain
memory operations. An attacker could possibly use this issue to cause a
denial of service (application crash). (CVE-2023-4806, CVE-2023-4813)

It was discovered that the GNU C library was not properly implementing a
fix for CVE-2023-4806 in certain cases, which could lead to a memory leak.
An attacker could possibly use this issue to cause a denial of service
(application crash). This issue only affected Ubuntu 22.04 LTS and Ubuntu
23.04. (CVE-2023-5156)

Update instructions

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

Ubuntu 22.04

• libc-bin - 2.35-0ubuntu3.6
• libc6 - 2.35-0ubuntu3.6
• nscd - 2.35-0ubuntu3.6

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

References

• https://launchpad.net/bugs/2047155