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.
Advisories
Source ID Title
Debian DLA Debian DLA DLA-1522-1 strongswan security update
Debian DSA Debian DSA DSA-4305-1 strongswan security update
Debian DSA Debian DSA DSA-4309-1 strongswan security update
EUVD EUVD EUVD-2018-8006 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.
Ubuntu USN Ubuntu USN USN-3771-1 strongSwan vulnerabilities
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 03 Dec 2025 21:15:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2025-12-03T20:26:00.122Z

Reserved: 2018-08-29T00:00:00.000Z

Link: CVE-2018-16151

cve-icon Vulnrichment

Updated: 2024-08-05T10:17:37.623Z

cve-icon NVD

Status : Modified

Published: 2018-09-26T21:29:01.087

Modified: 2025-12-03T21:15:50.587

Link: CVE-2018-16151

cve-icon Redhat

Severity : Moderate

Publid Date: 2018-09-24T00:00:00Z

Links: CVE-2018-16151 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses