In strongSwan before 5.9.5, a malicious responder can send an EAP-Success message too early without actually authenticating the client and (in the case of EAP methods with mutual authentication and EAP-only authentication for IKEv2) even without server authentication.

An update of the strongswan package has been released.

The remote host is affected by the vulnerability described in GLSA-202405-08 (strongSwan: Multiple Vulnerabilities)

  - The in-memory certificate cache in strongSwan before 5.9.4 has a remote integer overflow upon receiving     many requests with different certificates to fill the cache and later trigger the replacement of cache     entries. The code attempts to select a less-often-used cache entry by means of a random number generator,     but this is not done correctly. Remote code execution might be a slight possibility. (CVE-2021-41991)

  - In strongSwan before 5.9.5, a malicious responder can send an EAP-Success message too early without     actually authenticating the client and (in the case of EAP methods with mutual authentication and EAP-only     authentication for IKEv2) even without server authentication. (CVE-2021-45079)

  - strongSwan before 5.9.8 allows remote attackers to cause a denial of service in the revocation plugin by     sending a crafted end-entity (and intermediate CA) certificate that contains a CRL/OCSP URL that points to     a server (under the attacker's control) that doesn't properly respond but (for example) just does nothing     after the initial TCP handshake, or sends an excessive amount of application data. (CVE-2022-40617)

  - strongSwan 5.9.8 and 5.9.9 potentially allows remote code execution because it uses a variable named     public for two different purposes within the same function. There is initially incorrect access control,     later followed by an expired pointer dereference. One attack vector is sending an untrusted client     certificate during EAP-TLS. A server is affected only if it loads plugins that implement TLS-based EAP     methods (EAP-TLS, EAP-TTLS, EAP-PEAP, or EAP-TNC). This is fixed in 5.9.10. (CVE-2023-26463)

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

The remote SUSE Linux SUSE15 host has packages installed that are affected by a vulnerability as referenced in the openSUSE-SU-2022:0492-1 advisory.

  - In strongSwan before 5.9.5, a malicious responder can send an EAP-Success message too early without     actually authenticating the client and (in the case of EAP methods with mutual authentication and EAP-only     authentication for IKEv2) even without server authentication. (CVE-2021-45079)

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

The remote SUSE Linux SLED15 / SLES15 / SLES_SAP15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2022:0492-1 advisory.

  - In strongSwan before 5.9.5, a malicious responder can send an EAP-Success message too early without     actually authenticating the client and (in the case of EAP methods with mutual authentication and EAP-only     authentication for IKEv2) even without server authentication. (CVE-2021-45079)

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

The remote SUSE Linux SLES11 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2022:14887-1 advisory.

  - 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. (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 in the     digestAlgorithm.parameters field during PKCS#1 v1.5 signature verification. Consequently, 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. This is a variant of     CVE-2006-4790 and CVE-2014-1568. (CVE-2018-16152)

  - The gmp plugin in strongSwan before 5.7.1 has a Buffer Overflow via a crafted certificate.
    (CVE-2018-17540)

  - In strongSwan before 5.9.5, a malicious responder can send an EAP-Success message too early without     actually authenticating the client and (in the case of EAP methods with mutual authentication and EAP-only     authentication for IKEv2) even without server authentication. (CVE-2021-45079)

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

The remote Debian 9 host has packages installed that are affected by a vulnerability as referenced in the dla-2909 advisory.

  - In strongSwan before 5.9.5, a malicious responder can send an EAP-Success message too early without     actually authenticating the client and (in the case of EAP methods with mutual authentication and EAP-only     authentication for IKEv2) even without server authentication. (CVE-2021-45079)

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

The remote Debian 10 / 11 host has packages installed that are affected by a vulnerability as referenced in the dsa-5056 advisory.

  - In strongSwan before 5.9.5, a malicious responder can send an EAP-Success message too early without     actually authenticating the client and (in the case of EAP methods with mutual authentication and EAP-only     authentication for IKEv2) even without server authentication. (CVE-2021-45079)

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

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the ccaea96b-7dcd-11ec-93df-00224d821998 advisory.

  - In strongSwan before 5.9.5, a malicious responder can send an EAP-Success message too early without     actually authenticating the client and (in the case of EAP methods with mutual authentication and EAP-only     authentication for IKEv2) even without server authentication. (CVE-2021-45079)

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

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2022:0211-1 advisory.

  - In strongSwan before 5.9.5, a malicious responder can send an EAP-Success message too early without     actually authenticating the client and (in the case of EAP methods with mutual authentication and EAP-only     authentication for IKEv2) even without server authentication. (CVE-2021-45079)

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

The remote SUSE Linux SLES12 / SLES_SAP12 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2022:0202-1 advisory.

  - In strongSwan before 5.9.5, a malicious responder can send an EAP-Success message too early without     actually authenticating the client and (in the case of EAP methods with mutual authentication and EAP-only     authentication for IKEv2) even without server authentication. (CVE-2021-45079)

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

The remote Ubuntu 16.04 ESM host has packages installed that are affected by a vulnerability as referenced in the USN-5250-2 advisory.

    USN-5250-1 fixed a vulnerability in strongSwan. This update provides the corresponding update for Ubuntu     14.04 ESM and Ubuntu 16.04 ESM.



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

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

The remote Ubuntu 18.04 LTS / 20.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-5250-1 advisory.

    Zhuowei Zhang discovered that stringSwan incorrectly handled EAP authentication. A remote attacker could     use this issue to cause strongSwan to crash, resulting in a denial of service, or possibly bypass client     and server authentication.

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

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

ID	Name	Product	Family	Severity
203734	Photon OS 3.0: Strongswan PHSA-2022-3.0-0361	Nessus	PhotonOS Local Security Checks	critical
203259	Photon OS 4.0: Strongswan PHSA-2022-4.0-0152	Nessus	PhotonOS Local Security Checks	critical
194978	GLSA-202405-08 : strongSwan: Multiple Vulnerabilities	Nessus	Gentoo Local Security Checks	critical
158223	openSUSE 15 Security Update : strongswan (openSUSE-SU-2022:0492-1)	Nessus	SuSE Local Security Checks	critical
158185	SUSE SLED15 / SLES15 Security Update : strongswan (SUSE-SU-2022:0492-1)	Nessus	SuSE Local Security Checks	critical
158172	SUSE SLES11 Security Update : strongswan (SUSE-SU-2022:14887-1)	Nessus	SuSE Local Security Checks	critical
157379	Debian DLA-2909-1 : strongswan - LTS security update	Nessus	Debian Local Security Checks	critical
157253	Debian DSA-5056-1 : strongswan - security update	Nessus	Debian Local Security Checks	critical
157235	FreeBSD : strongswan - Incorrect Handling of Early EAP-Success Messages (ccaea96b-7dcd-11ec-93df-00224d821998)	Nessus	FreeBSD Local Security Checks	critical
157180	SUSE SLES15 Security Update : strongswan (SUSE-SU-2022:0211-1)	Nessus	SuSE Local Security Checks	critical
157151	SUSE SLES12 Security Update : strongswan (SUSE-SU-2022:0202-1)	Nessus	SuSE Local Security Checks	critical
157059	Ubuntu 16.04 ESM : strongSwan vulnerability (USN-5250-2)	Nessus	Ubuntu Local Security Checks	critical
157057	Ubuntu 18.04 LTS / 20.04 LTS : strongSwan vulnerability (USN-5250-1)	Nessus	Ubuntu Local Security Checks	critical

Detections

Analytics

CVE-2021-45079

critical

Tenable Plugins

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