==========================================================================
Ubuntu Security Notice USN-6541-1
December 07, 2023

glibc vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 23.04
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)

Summary:

Several security issues were fixed in GNU C Library.

Software Description:
- glibc: GNU C Library

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 23.04. (CVE-2023-5156)

Update instructions:

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

Ubuntu 23.04:
libc-bin 2.37-0ubuntu2.2
libc6 2.37-0ubuntu2.2

Ubuntu 22.04 LTS:
libc-bin 2.35-0ubuntu3.5
libc6 2.35-0ubuntu3.5

Ubuntu 20.04 LTS:
libc-bin 2.31-0ubuntu9.14
libc6 2.31-0ubuntu9.14

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
libc-bin 2.27-3ubuntu1.6+esm1
libc6 2.27-3ubuntu1.6+esm1

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
libc-bin 2.23-0ubuntu11.3+esm5
libc6 2.23-0ubuntu11.3+esm5

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-6541-1
CVE-2023-4806, CVE-2023-4813, CVE-2023-5156

Package Information:
https://launchpad.net/ubuntu/+source/glibc/2.37-0ubuntu2.2
https://launchpad.net/ubuntu/+source/glibc/2.35-0ubuntu3.5
https://launchpad.net/ubuntu/+source/glibc/2.31-0ubuntu9.14