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[USN-7841-1] strongSwan vulnerability

Posted on 27 October 2025
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-7841-1
October 27, 2025

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

- Ubuntu 25.10
- Ubuntu 25.04
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

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

Software Description:
- strongswan: IPsec VPN solution

Details:

Xu Biang discovered that the strongSwan client incorrectly handled
EAP-MSCHAPv2 failure requests. If a user or automated system were tricked
into connecting to a malicious server, 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 25.10
libstrongswan 6.0.1-6ubuntu4.1
strongswan 6.0.1-6ubuntu4.1

Ubuntu 25.04
libstrongswan 5.9.13-2ubuntu4.25.04.1
strongswan 5.9.13-2ubuntu4.25.04.1

Ubuntu 24.04 LTS
libstrongswan 5.9.13-2ubuntu4.24.04.1
strongswan 5.9.13-2ubuntu4.24.04.1

Ubuntu 22.04 LTS
libstrongswan 5.9.5-2ubuntu2.4
strongswan 5.9.5-2ubuntu2.4

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

References:
https://ubuntu.com/security/notices/USN-7841-1
CVE-2025-62291

Package Information:
https://launchpad.net/ubuntu/+source/strongswan/6.0.1-6ubuntu4.1
https://launchpad.net/ubuntu/+source/strongswan/5.9.13-2ubuntu4.25.04.1
https://launchpad.net/ubuntu/+source/strongswan/5.9.13-2ubuntu4.24.04.1
https://launchpad.net/ubuntu/+source/strongswan/5.9.5-2ubuntu2.4

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