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.

• CWE-347
• CWE-347

• https://lists.opensuse.org/opensuse-security-announce/2019-11/msg00077.html
• https://lists.opensuse.org/opensuse-security-announce/2019-12/msg00001.html
• https://lists.opensuse.org/opensuse-security-announce/2020-03/msg00047.html
• https://lists.debian.org/debian-lts-announce/2018/09/msg00032.htmlMailing List, Third Party Advisory
• https://security.gentoo.org/glsa/201811-16Third Party Advisory
• https://usn.ubuntu.com/3771-1/Third Party Advisory
• https://www.debian.org/security/2018/dsa-4305Third Party Advisory
• https://www.strongswan.org/blog/2018/09/24/strongswan-vulnerability-%28cve-2018-16151%2C-cve-2018-16152%29.html
• https://lists.opensuse.org/opensuse-security-announce/2019-11/msg00077.html
• https://lists.opensuse.org/opensuse-security-announce/2019-12/msg00001.html
• https://lists.opensuse.org/opensuse-security-announce/2020-03/msg00047.html
• https://lists.debian.org/debian-lts-announce/2018/09/msg00032.htmlMailing List, Third Party Advisory
• https://security.gentoo.org/glsa/201811-16Third Party Advisory
• https://usn.ubuntu.com/3771-1/Third Party Advisory
• https://www.debian.org/security/2018/dsa-4305Third Party Advisory
• https://www.strongswan.org/blog/2018/09/24/strongswan-vulnerability-%28cve-2018-16151%2C-cve-2018-16152%29.html

Published

Sep 26, 2018

Last Modified

Jun 17, 2026

Status

Modified

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