=========================================================================Ubuntu Security Notice USN-6166-2
June 19, 2023

libcap2 vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)
- Ubuntu 14.04 LTS (Available with Ubuntu Pro)

Summary:

libcap could be made to crash or possibly execute arbitrary code
if it received a specially crafted input.

Software Description:
- libcap2: POSIX 1003.1e capabilities (library)

Details:

USN-6166-1 fixed a vulnerability in libcap2. This update provides
the corresponding update for Ubuntu 14.04 ESM, Ubuntu 16.04 ESM
and Ubuntu 18.04 ESM.

Original advisory details:

 Richard Weinberger discovered that libcap2 incorrectly handled certain long
 input strings. An attacker could use this issue to cause libcap2 to crash,
 resulting in a denial of service, or possibly execute arbitrary code.
 (CVE-2023-2603)

Update instructions:

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

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
  libcap2                         1:2.25-1.2ubuntu0.1~esm1
  libcap2-bin                     1:2.25-1.2ubuntu0.1~esm1

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
  libcap2                         1:2.24-12ubuntu0.1~esm1
  libcap2-bin                     1:2.24-12ubuntu0.1~esm1

Ubuntu 14.04 LTS (Available with Ubuntu Pro):
  libcap2                         1:2.24-0ubuntu2+esm1
  libcap2-bin                     1:2.24-0ubuntu2+esm1

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

References:
  https://ubuntu.com/security/notices/USN-6166-2
  https://ubuntu.com/security/notices/USN-6166-1
  CVE-2023-2603