strongSwan 4.6.4 fixes a security vulnerability which affects all versions since 4.2.0 if the gmp plugin is used for RSA signature verification.
This release fixes a security vulnerability (CVE-2012-2388) which exists in all versions since 4.2.0 and up to 4.6.3. If the gmp plugin is used for RSA signature verification (the default on many platforms) an empty or zeroed signature is handled as a legitimate one. Both IKEv1 and IKEv2 are affected.
A connection definition using RSA authentication is required to exploit this vulnerability. Given that, an attacker presenting a forged signature and/or certificate can authenticate as any legitimate user. Injecting code is not possible by such an attack.
Download it from here.