Debian: DSA-6041-1 strongSwan Critical Buffer Overflow CVE-2025-62291

The eap-mschapv2 plugin doesn't correctly check the length of an
EAP-MSCHAPv2 Failure Request packet on the client, which can cause an
integer underflow that leads to a crash, and a heap-based buffer
overflow that's potentially exploitable for remote code execution.

For the oldstable distribution (bookworm), this problem has been fixed
in version 5.9.8-5+deb12u2.

For the stable distribution (trixie), this problem has been fixed in
version 6.0.1-6+deb13u2.

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/source-package/strongswan

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