This update for strongswan fixes the following issues :

  - CVE-2017-11185: Specific RSA signatures passed to the     gmp plugin for verification can cause a NULL pointer     dereference and it may lead to a denial of service     (bsc#1051222)

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the strongimcv package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

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

  - 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)

  - 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)

  - strongSwan 5.6.0 and older allows Remote Denial of     Service because of Missing Initialization of a     Variable.(CVE-2018-10811)

  - The gmp plugin in strongSwan before 5.5.3 does not     properly validate RSA public keys before calling     mpz_powm_sec, which allows remote peers to cause a     denial of service (floating point exception and process     crash) via a crafted certificate.(CVE-2017-9022)

  - The gmp plugin in strongSwan before 5.6.0 allows remote     attackers to cause a denial of service (NULL pointer     dereference and daemon crash) via a crafted RSA     signature.(CVE-2017-11185)

  - The server implementation of the EAP-MSCHAPv2 protocol     in the eap-mschapv2 plugin in strongSwan 4.2.12 through     5.x before 5.3.4 does not properly validate local     state, which allows remote attackers to bypass     authentication via an empty Success message in response     to an initial Challenge message.(CVE-2015-8023)

  - strongSwan 4.3.0 through 5.x before 5.3.2 and     strongSwan VPN Client before 1.4.6, when using EAP or     pre-shared keys for authenticating an IKEv2 connection,     does not enforce server authentication restrictions     until the entire authentication process is complete,     which allows remote servers to obtain credentials by     using a valid certificate and then reading the     responses.(CVE-2015-4171)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

A denial of service vulnerability was identified in strongSwan, an IKE/IPsec suite, using Google's OSS-Fuzz fuzzing project.

The gmp plugin in strongSwan had insufficient input validation when verifying RSA signatures. This coding error could lead to a NULL pointer dereference, leading to process crash.

The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-3397-1 advisory.

    It was discovered that strongSwan incorrectly handled verifying specific RSA signatures. A remote attacker     could use this issue to cause strongSwan to crash, resulting in a denial of service.

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.

An update of the strongswan package has been released.

It was discovered that there was a denial of service vulnerability in the Strongswan Virtual Private Network (VPN) software.

Specific RSA signatures passed to the gmp plugin for verification could cause a NULL pointer dereference. Potential triggers are signatures in certificates, but also signatures used during IKE authentication.

For more details, please see :

<https://www.strongswan.org/blog/2017/08/14/strongswan-vulnerability-( cve-2017-11185).html>

For Debian 7 'Wheezy', this issue has been fixed in strongswan version 4.5.2-1.5+deb7u10.

We recommend that you upgrade your strongswan packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Published	Updated	Severity
102840	SUSE SLES11 Security Update : strongswan (SUSE-SU-2017:2293-1)	Nessus	SuSE Local Security Checks	8/30/2017	1/19/2021	high
146695	EulerOS 2.0 SP2 : strongimcv (EulerOS-SA-2021-1364)	Nessus	Huawei Local Security Checks	2/22/2021	2/24/2021	high
102929	Debian DSA-3962-1 : strongswan - security update	Nessus	Debian Local Security Checks	9/5/2017	1/4/2021	high
102678	Ubuntu 14.04 LTS / 16.04 LTS : strongSwan vulnerability (USN-3397-1)	Nessus	Ubuntu Local Security Checks	8/22/2017	8/27/2024	high
121747	Photon OS 1.0: Strongswan PHSA-2017-0040	Nessus	PhotonOS Local Security Checks	2/7/2019	7/22/2024	high
102476	SUSE SLED12 / SLES12 Security Update : strongswan (SUSE-SU-2017:2143-1)	Nessus	SuSE Local Security Checks	8/14/2017	1/6/2021	high
102594	Debian DLA-1059-1 : strongswan security update	Nessus	Debian Local Security Checks	8/21/2017	1/11/2021	high

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