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Ubuntu Security Notice USN-6488-2

Ubuntu Security Notice USN-6488-2
Posted Dec 15, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6488-2 - USN-6488-1 fixed a vulnerability in strongSwan. This update provides the corresponding updates for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. Florian Picca discovered that strongSwan incorrectly handled certain DH public values. A remote attacker could use this issue to cause strongSwan to crash, resulting in a denial of service, or possibly execute arbitrary code.

tags | advisory, remote, denial of service, arbitrary
systems | linux, ubuntu
advisories | CVE-2023-41913
SHA-256 | 338f4a5b2aa85b89f8b08d5684422107226ac51c46249766ac922c0b469c720e

Ubuntu Security Notice USN-6488-2

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-6488-2
December 14, 2023

strongswan 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)

Summary:

strongSwan could be made to crash or run programs if it received
specially crafted network traffic.

Software Description:
- strongswan: IPsec VPN solution

Details:

USN-6488-1 fixed a vulnerability in strongSwan. This update provides
the corresponding updates for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS.

Original advisory details:

Florian Picca discovered that strongSwan incorrectly handled certain DH
public values. A remote attacker could use this issue to cause strongSwan
to crash, resulting in a denial of service, or possibly execute arbitrary
code.

Update instructions:

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

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
libstrongswan 5.6.2-1ubuntu2.9+esm1
strongswan 5.6.2-1ubuntu2.9+esm1

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
libstrongswan 5.3.5-1ubuntu3.8+esm4
strongswan 5.3.5-1ubuntu3.8+esm4

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

References:
https://ubuntu.com/security/notices/USN-6488-2
https://ubuntu.com/security/notices/USN-6488-1
CVE-2023-41913

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