The GMP Plugin in strongSwan 4.2.0 through 4.6.3 allows remote attackers to bypass authentication via a (1) empty or (2) zeroed RSA signature, aka "RSA signature verification vulnerability."

Strongswan's gmp plugin could treat empty RSA signature as valid ones

This update fixed a security issue in strongswan's 'gmp' plugin which could be exploited by attackers to forge RSA signature/certificate to authenticate as any legitimate user. (CVE-2012-2388)

An authentication bypass issue was discovered by the Codenomicon CROSS project in strongSwan, an IPsec-based VPN solution. When using RSA-based setups, a missing check in the gmp plugin could allow an attacker presenting a forged signature to successfully authenticate against a strongSwan responder.

The default configuration in Debian does not use the gmp plugin for RSA operations but rather the OpenSSL plugin, so the packages as shipped by Debian are not vulnerable.

ID	Name	Product	Family	Severity
74642	openSUSE Security Update : strongswan (openSUSE-SU-2012:0691-1)	Nessus	SuSE Local Security Checks	high
64226	SuSE 11.1 Security Update : strongswan (SAT Patch Number 6333)	Nessus	SuSE Local Security Checks	high
59761	Debian DSA-2483-1 : strongswan - authentication bypass	Nessus	Debian Local Security Checks	high
59355	SuSE 10 Security Update : strongswan (ZYPP Patch Number 8138)	Nessus	SuSE Local Security Checks	high

Detections

Analytics

CVE-2012-2388

critical

Tenable Plugins

high

high

high

high