An update of the strongswan package has been released.

strongSwan security team reports :

- RSA public keys passed to the gmp plugin aren't validated sufficiently before attempting signature verification, so that invalid input might lead to a floating point exception. [CVE-2017-9022]

- ASN.1 CHOICE types are not correctly handled by the ASN.1 parser when parsing X.509 certificates with extensions that use such types.
This could lead to infinite looping of the thread parsing a specifically crafted certificate.

Two denial of service vulnerabilities were identified in strongSwan, an IKE/IPsec suite, using Google's OSS-Fuzz fuzzing project.

CVE-2017-9022

RSA public keys passed to the gmp plugin aren't validated sufficiently before attempting signature verification, so that invalid input might lead to a floating point exception and crash of the process. A certificate with an appropriately prepared public key sent by a peer could be used for a denial of service attack.

CVE-2017-9023

ASN.1 CHOICE types are not correctly handled by the ASN.1 parser when parsing X.509 certificates with extensions that use such types. This could lead to infinite looping of the thread parsing a specifically crafted certificate.

For Debian 7 'Wheezy', these problems have been fixed in version 4.5.2-1.5+deb7u9.

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.

Two denial of service vulnerabilities were identified in strongSwan, an IKE/IPsec suite, using Google's OSS-Fuzz fuzzing project.

  - CVE-2017-9022     RSA public keys passed to the gmp plugin aren't     validated sufficiently before attempting signature     verification, so that invalid input might lead to a     floating point exception and crash of the process. A     certificate with an appropriately prepared public key     sent by a peer could be used for a denial-of-service     attack.

  - CVE-2017-9023     ASN.1 CHOICE types are not correctly handled by the     ASN.1 parser when parsing X.509 certificates with     extensions that use such types. This could lead to     infinite looping of the thread parsing a specifically     crafted certificate.

A fix for a build failure was additionally included in the 5.2.1-6+deb8u4 revision of the strongSwan package.

It was discovered that the strongSwan gmp plugin incorrectly validated RSA public keys. A remote attacker could use this issue to cause strongSwan to crash, resulting in a denial of service. (CVE-2017-9022)

It was discovered that strongSwan incorrectly parsed ASN.1 CHOICE types. A remote attacker could use this issue to cause strongSwan to hang, resulting in a denial of service. (CVE-2017-9023).

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

This update for strongswan fixes the following issues :

  - CVE-2017-9022: Insufficient Input Validation in gmp     Plugin leads to Denial of service (bsc#1039514)

  - CVE-2017-9023: Incorrect x509 ASN.1 parser error     handling could lead to Denial of service (bsc#1039515)

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.

This update for strongswan fixes the following issues :

  - CVE-2017-9022: Insufficient Input Validation in gmp     Plugin leads to Denial of service (bsc#1039514)

  - CVE-2017-9023: Incorrect x509 ASN.1 parser error     handling could lead to Denial of service (bsc#1039515)

  - IKEv1 protocol is vulnerable to DoS amplification attack     (bsc#985012)

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.

ID	Name	Product	Family	Published	Updated	Severity
121830	Photon OS 1.0: Strongswan PHSA-2018-1.0-0126	Nessus	PhotonOS Local Security Checks	2/7/2019	5/24/2022	high
101829	FreeBSD : strongswan -- multiple vulnerabilities (e6ccaf8a-6c63-11e7-9b01-2047478f2f70)	Nessus	FreeBSD Local Security Checks	7/20/2017	1/4/2021	high
100577	Debian DLA-973-1 : strongswan security update	Nessus	Debian Local Security Checks	6/2/2017	1/11/2021	high
100520	Debian DSA-3866-1 : strongswan - security update	Nessus	Debian Local Security Checks	5/31/2017	1/11/2021	high
100546	Ubuntu 14.04 LTS / 16.04 LTS : strongSwan vulnerabilities (USN-3301-1)	Nessus	Ubuntu Local Security Checks	5/31/2017	10/23/2023	high
100588	SUSE SLES11 Security Update : strongswan (SUSE-SU-2017:1471-1)	Nessus	SuSE Local Security Checks	6/2/2017	1/19/2021	high
100589	SUSE SLED12 / SLES12 Security Update : strongswan (SUSE-SU-2017:1473-1)	Nessus	SuSE Local Security Checks	6/2/2017	1/6/2021	high
146695	EulerOS 2.0 SP2 : strongimcv (EulerOS-SA-2021-1364)	Nessus	Huawei Local Security Checks	2/22/2021	2/24/2021	high

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