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CVE-2018-16151

Published: 24 September 2018

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.

Priority

Medium

CVSS 3 base score: 7.5

Status

Package Release Status
strongswan
Launchpad, Ubuntu, Debian
bionic
Released (5.6.2-1ubuntu2.2)
precise Does not exist

trusty
Released (5.1.2-0ubuntu2.10)
upstream Needs triage

xenial
Released (5.3.5-1ubuntu3.7)