The GMP Plugin in strongSwan 4.2.0 through 4.6.3 allows remote attackers to bypass authentication via a (1) empty or (2) zeroed RSA signature, aka "RSA signature verification vulnerability."

The Rocky Linux 8.6 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ ciqsa-2026_1607 advisory.

    This advisory aggregates security fixes for the strongswan SRPM in CIQ LTS 8.6. It addresses 12 CVEs:
    CVE-2018-16152, CVE-2018-16151, CVE-2013-2944, CVE-2012-2388, CVE-2021-41990, and 7 more.

Tenable has extracted the preceding description block directly from the CIQ security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Strongswan's gmp plugin could treat empty RSA signature as valid ones

This update fixed a security issue in strongswan's 'gmp' plugin which could be exploited by attackers to forge RSA signature/certificate to authenticate as any legitimate user. (CVE-2012-2388)

An authentication bypass issue was discovered by the Codenomicon CROSS project in strongSwan, an IPsec-based VPN solution. When using RSA-based setups, a missing check in the gmp plugin could allow an attacker presenting a forged signature to successfully authenticate against a strongSwan responder.

The default configuration in Debian does not use the gmp plugin for RSA operations but rather the OpenSSL plugin, so the packages as shipped by Debian are not vulnerable.

ID	Name	Product	Family	Type	Severity
364607	Rocky Linux 8.6 [CIQ] Security Update: perl-vici / python3-vici / strongswan / strongswan-charon-nm / etc Multiple Vulnerabilities (ciqsa-2026_1607)	Nessus	Rocky Linux Local Security Checks	Local	critical
74642	openSUSE Security Update : strongswan (openSUSE-SU-2012:0691-1)	Nessus	SuSE Local Security Checks	Local	high
64226	SuSE 11.1 Security Update : strongswan (SAT Patch Number 6333)	Nessus	SuSE Local Security Checks	Local	high
59761	Debian DSA-2483-1 : strongswan - authentication bypass	Nessus	Debian Local Security Checks	Local	high
59355	SuSE 10 Security Update : strongswan (ZYPP Patch Number 8138)	Nessus	SuSE Local Security Checks	Local	high

Detections

Analytics

CVE-2012-2388

critical

Tenable Plugins

critical

high

high

high

high