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.

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.

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.

This update for strongswan provides the following fixes :

Security issues fixed :

CVE-2018-5388: Fixed a buffer underflow which may allow to a remote attacker with local user credentials to resource exhaustion and denial of service while reading from the socket (bsc#1094462).

CVE-2018-10811: Fixed a denial of service during the IKEv2 key derivation if the openssl plugin is used in FIPS mode and HMAC-MD5 is negotiated as PRF (bsc#1093536).

CVE-2018-16151,CVE-2018-16152: Fixed multiple flaws in the gmp plugin which might lead to authorization bypass (bsc#1107874).

CVE-2018-17540: Fixed an improper input validation in gmp plugin (bsc#1109845).

Other issues addressed: Fixed some client fails when the scep server URL is used with HTTPS protocol (bsc#1071853).

Reject Diffie-Hellman key exchanges using primes smaller than 1024 bit.

Handle unexpected informational message from SonicWall. (bsc#1009254)

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 :

Security issues fixed :

  - CVE-2018-5388: Fixed a buffer underflow which may allow     to a remote attacker with local user credentials to     resource exhaustion and denial of service while reading     from the socket (bsc#1094462).

  - CVE-2018-10811: Fixed a denial of service during the     IKEv2 key derivation if the openssl plugin is used in     FIPS mode and HMAC-MD5 is negotiated as PRF     (bsc#1093536).

  - CVE-2018-16151,CVE-2018-16152: Fixed multiple flaws in     the gmp plugin which might lead to authorization bypass     (bsc#1107874).

  - CVE-2018-17540: Fixed an improper input validation in     gmp plugin (bsc#1109845). 

This update was imported from the SUSE:SLE-15:Update update project.

This update for strongswan fixes the following issues :

Security issues fixed :

CVE-2018-5388: Fixed a buffer underflow which may allow to a remote attacker with local user credentials to resource exhaustion and denial of service while reading from the socket (bsc#1094462).

CVE-2018-10811: Fixed a denial of service during the IKEv2 key derivation if the openssl plugin is used in FIPS mode and HMAC-MD5 is negotiated as PRF (bsc#1093536).

CVE-2018-16151,CVE-2018-16152: Fixed multiple flaws in the gmp plugin which might lead to authorization bypass (bsc#1107874).

CVE-2018-17540: Fixed an improper input validation in gmp plugin (bsc#1109845).

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.

An update of the strongswan package has been released.

Updated to release 5.7.1

Security fix for :

  - CVE-2018-16151

  - CVE-2018-16152

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

The remote host is affected by the vulnerability described in GLSA-201811-16 (strongSwan: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in strongSwan. Please       review the CVE identifiers referenced below for details.
  Impact :

    A remote attacker could cause a Denial of Service condition or       impersonate a user.
  Workaround :

    There is no known workaround at this time.

The remote Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3771-1 advisory.

    It was discovered that strongSwan incorrectly handled IKEv2 key derivation. A remote attacker could     possibly use this issue to cause strongSwan to crash, resulting in a denial of service. (CVE-2018-10811)

    Sze Yiu Chau discovered that strongSwan incorrectly handled parsing OIDs in the gmp plugin. A remote     attacker could possibly use this issue to bypass authorization. (CVE-2018-16151)

    Sze Yiu Chau discovered that strongSwan incorrectly handled certain parameters fields in the gmp plugin. A     remote attacker could possibly use this issue to bypass authorization. (CVE-2018-16152)

    It was discovered that strongSwan incorrectly handled the stroke plugin. A local administrator could use     this issue to cause a denial of service, or possibly execute arbitrary code. (CVE-2018-5388)

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

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

Sze Yiu Chau and his team from Purdue University and The University of Iowa found several security issues in the gmp plugin for strongSwan, an IKE/IPsec suite.

CVE-2018-16151

The OID parser in the ASN.1 code in gmp allows any number of random bytes after a valid OID.

CVE-2018-16152

The algorithmIdentifier parser in the ASN.1 code in gmp doesn't enforce a NULL value for the optional parameter which is not used with any PKCS#1 algorithm.

For Debian 8 'Jessie', these problems have been fixed in version 5.2.1-6+deb8u7.

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.

Sze Yiu Chau and his team from Purdue University and The University of Iowa found several issues in the gmp plugin for strongSwan, an IKE/IPsec suite.

Problems in the parsing and verification of RSA signatures could lead to a Bleichenbacher-style low-exponent signature forgery in certificates and during IKE authentication.

While the gmp plugin doesn't allow arbitrary data after the ASN.1 structure (the original Bleichenbacher attack), the ASN.1 parser is not strict enough and allows data in specific fields inside the ASN.1 structure.

Only installations using the gmp plugin are affected (on Debian OpenSSL plugin has priority over GMP one for RSA operations), and only when using keys and certificates (including ones from CAs) using keys with an exponent e = 3, which is usually rare in practice.

  - CVE-2018-16151     The OID parser in the ASN.1 code in gmp allows any     number of random bytes after a valid OID.

  - CVE-2018-16152     The algorithmIdentifier parser in the ASN.1 code in gmp     doesn't enforce a NULL value for the optional parameter     which is not used with any PKCS#1 algorithm.

ID	Name	Product	Family	Severity
158172	SUSE SLES11 Security Update : strongswan (SUSE-SU-2022:14887-1)	Nessus	SuSE Local Security Checks	critical
146695	EulerOS 2.0 SP2 : strongimcv (EulerOS-SA-2021-1364)	Nessus	Huawei Local Security Checks	high
135007	openSUSE Security Update : strongswan (openSUSE-2020-403)	Nessus	SuSE Local Security Checks	high
134852	SUSE SLED15 / SLES15 Security Update : strongswan (SUSE-SU-2020:0743-1)	Nessus	SuSE Local Security Checks	high
132009	SUSE SLED12 / SLES12 Security Update : strongswan (SUSE-SU-2019:3266-1)	Nessus	SuSE Local Security Checks	high
131541	openSUSE Security Update : strongswan (openSUSE-2019-2598)	Nessus	SuSE Local Security Checks	high
131537	openSUSE Security Update : strongswan (openSUSE-2019-2594)	Nessus	SuSE Local Security Checks	high
131306	SUSE SLED15 / SLES15 Security Update : strongswan (SUSE-SU-2019:3056-1)	Nessus	SuSE Local Security Checks	high
122028	Photon OS 2.0: Strongswan PHSA-2019-2.0-0125	Nessus	PhotonOS Local Security Checks	high
122019	Photon OS 1.0: Strongswan PHSA-2019-1.0-0203	Nessus	PhotonOS Local Security Checks	high
120663	Fedora 29 : strongswan (2018-a0d22c2a21)	Nessus	Fedora Local Security Checks	high
120469	Fedora 28 : strongswan (2018-61df554bb1)	Nessus	Fedora Local Security Checks	high
119161	GLSA-201811-16 : strongSwan: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
118123	Fedora 27 : strongswan (2018-9caa6528d2)	Nessus	Fedora Local Security Checks	high
117805	Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS : strongSwan vulnerabilities (USN-3771-1)	Nessus	Ubuntu Local Security Checks	high
117715	Debian DLA-1522-1 : strongswan security update	Nessus	Debian Local Security Checks	high
117678	Debian DSA-4305-1 : strongswan - security update	Nessus	Debian Local Security Checks	high

Detections

Analytics

CVE-2018-16151

high

Tenable Plugins

critical

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