Vulnerability in Strongswan
CVE-2018-16151
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.019 (78.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 78.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000
Affected products
- Strongswan
- Canonical Ubuntu Linux — versions 14.04, 16.04, 18.04
- Debian Linux — versions 8.0, 9.0
Weakness classification (CWE)
References
- www.debian.org/security/2018/dsa-4305 (vendor-advisory, Third Party Advisory)
- security.gentoo.org/glsa/201811-16 (vendor-advisory, Third Party Advisory)
- www.strongswan.org/blog/2018/09/24/strongswan-vulnerability-(cve-2018-16151,-cv…
- lists.debian.org/debian-lts-announce/2018/09/msg00032.html (mailing-list, Mailing List, Third Party Advisory)
- usn.ubuntu.com/3771-1/ (vendor-advisory, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2019-11/msg00077.html (vendor-advisory)
- lists.opensuse.org/opensuse-security-announce/2019-12/msg00001.html (vendor-advisory)
- lists.opensuse.org/opensuse-security-announce/2020-03/msg00047.html (vendor-advisory)
Frequently asked questions
- What is CVE-2018-16151?
- CVE-2018-16151 is a high-severity vulnerability in Strongswan, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2018-09-26.
- How severe is CVE-2018-16151?
- High severity. CVSS v3 base score is 7.5 out of 10.