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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 Severity Score

7.5

Score breakdown

Status

Package Release Status
strongswan
Launchpad, Ubuntu, Debian
bionic
Released (5.6.2-1ubuntu2.2)
trusty
Released (5.1.2-0ubuntu2.10)
upstream Needs triage

xenial
Released (5.3.5-1ubuntu3.7)

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact High
Availability impact None
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N