CVE Vulnerabilities

CVE-2018-16151

Improper Verification of Cryptographic Signature

Published: Sep 26, 2018 | Modified: Dec 01, 2019
CVSS 3.x
7.5
HIGH
Source:
NVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS 2.x
5 MEDIUM
AV:N/AC:L/Au:N/C:N/I:P/A:N
RedHat/V2
RedHat/V3
5.6 MODERATE
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Ubuntu

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.

Weakness

The software does not verify, or incorrectly verifies, the cryptographic signature for data.

Affected Software

Name Vendor Start Version End Version
Strongswan Strongswan 4.0.0 4.6.4
Strongswan Strongswan 5.0.0 *
Strongswan Ubuntu bionic *
Strongswan Ubuntu devel *
Strongswan Ubuntu esm-infra/xenial *
Strongswan Ubuntu trusty *
Strongswan Ubuntu trusty/esm *
Strongswan Ubuntu xenial *

References