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Change History

In Openswan before 2.6.50.1, IKEv2 signature verification is vulnerable to "Variants of Bleichenbacher's Low-Exponent Attack on PKCS#1 RSA Signatures" attacks when RAW RSA keys are used.

In verify_signed_hash() in lib/liboswkeys/signatures.c in Openswan before 2.6.50.1, the RSA implementation does not verify the value of padding string during PKCS#1 v1.5 signature verification. Consequently, a remote attacker can forge signatures when small public exponents are being used. IKEv2 signature verification is affected when RAW RSA keys are used.

https://github.com/xelerance/Openswan/commit/9eaa6c2a823c1d2b58913506a15f9474bf857a3d [No Types Assigned]