Description
strongSwan 4.3.5 through 5.0.3, when using the OpenSSL plugin for ECDSA signature verification, allows remote attackers to authenticate as other users via an invalid signature.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | strongswan | 4.6.4-7 | — |
| Debian 13 | strongswan | 4.6.4-7 | — |
| Debian 12 | strongswan | 4.6.4-7 | — |
| Debian 7 | strongswan | 4.5.2-1.5+deb7u1 | DSA-2665-1 |
| Debian 6.0 | strongswan | 4.4.1-5.3 | DSA-2665-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | strongswan | 5.3.5-1.1 | openSUSE-SU-2024:10579-1 |
Advisories 2
- DSA-2665-1 strongswan - authentication bypass Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10579-1 strongswan-5.3.5-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- http://www.strongswan.org/blog/2013/04/30/strongswan-5.0.4-released-%28cve-2013-2944%29.html
- openSUSE-SU-2013:0985 vendor-advisory
- DSA-2665 vendor-advisory
- 59580 vdb-entry
- openSUSE-SU-2013:0774 vendor-advisory
- openSUSE-SU-2013:0873 vendor-advisory
- http://download.strongswan.org/patches/10_openssl_ecdsa_signature_patch/strongswan-4.3.5-5.0.3_openssl_ecdsa_signature.patch