A libcap2 security update has been released for Ubuntu Linux 14.04 LTS, 16.04 LTS, and 18.04 LTS.

[USN-6166-2] libcap2 vulnerability

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

libcap2 vulnerability
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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