Debian alert DLA-4512-1 (strongswan)

From:
             
 
Thorsten Alteholz <debian@alteholz.de>
To:
             
 
debian-lts-announce@lists.debian.org
Subject:
             
 
[SECURITY] [DLA 4512-1] strongswan security update
Date:
             
 
Fri, 27 Mar 2026 18:21:41 +0000
Message-ID:
             
 
<27e054b9-7692-494-def7-d882f669de89@alteholz.de>
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Debian LTS Advisory DLA-4512-1                debian-lts@lists.debian.org
https://www.debian.org/lts/security/                    Thorsten Alteholz
March 27, 2026                                https://wiki.debian.org/LTS
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Package        : strongswan
Version        : 5.9.1-1+deb11u6
CVE ID         : CVE-2026-25075


Kazuma Matsumoto discovered an integer overflow bug in the EAP-TTLS plugin 
of strongSwan, an IKE/IPsec suite.

The EAP-TTLS plugin doesn't check the length field in the header of
attribute-value pairs (AVPs) tunneled in EAP-TTLS, which can cause an 
integer underflow that may lead to a crash. An unauthenticated attacker 
could exploit this for a DoS attack by sending a crafted message.


For Debian 11 bullseye, this problem has been fixed in version
5.9.1-1+deb11u6.

We recommend that you upgrade your strongswan packages.

For the detailed security status of strongswan please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/strongswan

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS

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