CVE-2018-16151

Description

In verify_emsa_pkcs1_signature() in gmp_rsa_public_key.c in the gmp plugin in strongSwan 4.x and 5.x before 5.7.0, the RSA implementation based on GMP does not reject excess data after the encoded algorithm OID during PKCS#1 v1.5 signature verification. Similar to the flaw in the same version of strongSwan regarding digestAlgorithm.parameters, a remote attacker can forge signatures when small public exponents are being used, which could lead to impersonation when only an RSA signature is used for IKEv2 authentication.

References

http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00077.html

http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00001.html

https://lists.debian.org/debian-lts-announce/2018/09/msg00032.html

https://security.gentoo.org/glsa/201811-16

https://usn.ubuntu.com/3771-1/

https://www.debian.org/security/2018/dsa-4305

https://www.strongswan.org/blog/2018/09/24/strongswan-vulnerability-(cve-2018-16151,-cve-2018-16152).html

Details

Risk Information

CVSS v2

CVSS v3