GnuTLS version 3.5.12 and earlier is vulnerable to a NULL pointer dereference while decoding a status response TLS extension with valid contents. This could lead to a crash of the GnuTLS server application.

An update of the gnutls package has been released.

The remote host is affected by the vulnerability described in GLSA-201710-15 (GnuTLS: Denial of Service)

    A NULL pointer dereference while decoding a status response TLS       extension with valid contents was discovered in GnuTLS.
  Impact :

    A remote attacker could possibly cause a Denial of Service condition.
  Workaround :

    There is no known workaround at this time.

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

  - A double-free flaw was found in the way GnuTLS parsed     certain X.509 certificates with Proxy Certificate     Information extension. An attacker could create a     specially-crafted certificate which, when processed by     an application compiled against GnuTLS, could cause     that application to crash. (CVE-2017-5334)

  - Multiple flaws were found in the way gnutls processed     OpenPGP certificates. An attacker could create     specially crafted OpenPGP certificates which, when     parsed by gnutls, would cause it to crash.
    (CVE-2017-5335, CVE-2017-5336, CVE-2017-5337,     CVE-2017-7869)

  - A null pointer dereference flaw was found in the way     GnuTLS processed ClientHello messages with     status_request extension. A remote attacker could use     this flaw to cause an application compiled with GnuTLS     to crash. (CVE-2017-7507)

  - A flaw was found in the way GnuTLS validated     certificates using OCSP responses. This could falsely     report a certificate as valid under certain     circumstances. (CVE-2016-7444)

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.

An update for gnutls is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The gnutls packages provide the GNU Transport Layer Security (GnuTLS) library, which implements cryptographic algorithms and protocols such as SSL, TLS, and DTLS.

The following packages have been upgraded to a later upstream version:
gnutls (3.3.26). (BZ#1378373)

Security Fix(es) :

* A double-free flaw was found in the way GnuTLS parsed certain X.509 certificates with Proxy Certificate Information extension. An attacker could create a specially crafted certificate which, when processed by an application compiled against GnuTLS, could cause that application to crash. (CVE-2017-5334)

* Multiple flaws were found in the way gnutls processed OpenPGP certificates. An attacker could create specially crafted OpenPGP certificates which, when parsed by gnutls, would cause it to crash.
(CVE-2017-5335, CVE-2017-5336, CVE-2017-5337, CVE-2017-7869)

* A NULL pointer dereference flaw was found in the way GnuTLS processed ClientHello messages with status_request extension. A remote attacker could use this flaw to cause an application compiled with GnuTLS to crash. (CVE-2017-7507)

* A flaw was found in the way GnuTLS validated certificates using OCSP responses. This could falsely report a certificate as valid under certain circumstances. (CVE-2016-7444)

The CVE-2017-7507 issue was discovered by Hubert Kario (Red Hat QE BaseOS Security team).

Additional Changes :

For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.4 Release Notes linked from the References section.

The following packages have been upgraded to a later upstream version:
gnutls (3.3.26).

Security Fix(es) :

  - A double-free flaw was found in the way GnuTLS parsed     certain X.509 certificates with Proxy Certificate     Information extension. An attacker could create a     specially crafted certificate which, when processed by     an application compiled against GnuTLS, could cause that     application to crash. (CVE-2017-5334)

  - Multiple flaws were found in the way gnutls processed     OpenPGP certificates. An attacker could create specially     crafted OpenPGP certificates which, when parsed by     gnutls, would cause it to crash. (CVE-2017-5335,     CVE-2017-5336, CVE-2017-5337, CVE-2017-7869)

  - A NULL pointer dereference flaw was found in the way     GnuTLS processed ClientHello messages with     status_request extension. A remote attacker could use     this flaw to cause an application compiled with GnuTLS     to crash. (CVE-2017-7507)

  - A flaw was found in the way GnuTLS validated     certificates using OCSP responses. This could falsely     report a certificate as valid under certain     circumstances. (CVE-2016-7444)

From Red Hat Security Advisory 2017:2292 :

An update for gnutls is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The gnutls packages provide the GNU Transport Layer Security (GnuTLS) library, which implements cryptographic algorithms and protocols such as SSL, TLS, and DTLS.

The following packages have been upgraded to a later upstream version:
gnutls (3.3.26). (BZ#1378373)

Security Fix(es) :

* A double-free flaw was found in the way GnuTLS parsed certain X.509 certificates with Proxy Certificate Information extension. An attacker could create a specially crafted certificate which, when processed by an application compiled against GnuTLS, could cause that application to crash. (CVE-2017-5334)

* Multiple flaws were found in the way gnutls processed OpenPGP certificates. An attacker could create specially crafted OpenPGP certificates which, when parsed by gnutls, would cause it to crash.
(CVE-2017-5335, CVE-2017-5336, CVE-2017-5337, CVE-2017-7869)

* A NULL pointer dereference flaw was found in the way GnuTLS processed ClientHello messages with status_request extension. A remote attacker could use this flaw to cause an application compiled with GnuTLS to crash. (CVE-2017-7507)

* A flaw was found in the way GnuTLS validated certificates using OCSP responses. This could falsely report a certificate as valid under certain circumstances. (CVE-2016-7444)

The CVE-2017-7507 issue was discovered by Hubert Kario (Red Hat QE BaseOS Security team).

Additional Changes :

For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.4 Release Notes linked from the References section.

This update for gnutls fixes the following issues :

  - GNUTLS-SA-2017-4 / CVE-2017-7507: Fix crash in status     response TLS extension decoding (bsc#1043398)

  - GNUTLS-SA-2017-3 / CVE-2017-7869: Fix out-of-bounds     write in OpenPGP certificate decoding (bsc#1034173)

  - Address read of 4 bytes past the end of buffer in     OpenPGP certificate parsing (bsc#1038337)

This update was imported from the SUSE:SLE-12:Update update project.

- Update to upstream 3.5.13 release

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.

https://lists.gnupg.org/pipermail/gnutls-devel/2017-June/008446.html

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.

This update for gnutls fixes the following issues :

  - GNUTLS-SA-2017-4 / CVE-2017-7507: Fix crash in status     response TLS extension decoding (bsc#1043398)

  - GNUTLS-SA-2017-3 / CVE-2017-7869: Fix out-of-bounds     write in OpenPGP certificate decoding (bsc#1034173)

  - Address read of 4 bytes past the end of buffer in     OpenPGP certificate parsing (bsc#1038337)

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.

Hubert Kario discovered that GnuTLS, a library implementing the TLS and SSL protocols, does not properly decode a status response TLS extension, allowing a remote attacker to cause an application using the GnuTLS library to crash (denial of service).

The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3318-1 advisory.

    Hubert Kario discovered that GnuTLS incorrectly handled decoding a status response TLS extension. A remote     attacker could possibly use this issue to cause GnuTLS to crash, resulting in a denial of service. This     issue only applied to Ubuntu 16.04 LTS, Ubuntu 16.10 and Ubuntu 17.04. (CVE-2017-7507)

    It was discovered that GnuTLS incorrectly handled decoding certain OpenPGP certificates. A remote attacker     could use this issue to cause GnuTLS to crash, resulting in a denial of service, or possibly execute     arbitrary code. (CVE-2017-7869)

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.

ID	Name	Product	Family	Severity
202831	Photon OS 1.0: Gnutls PHSA-2017-0038	Nessus	PhotonOS Local Security Checks	high
103850	GLSA-201710-15 : GnuTLS: Denial of Service	Nessus	Gentoo Local Security Checks	high
103062	EulerOS 2.0 SP2 : gnutls (EulerOS-SA-2017-1204)	Nessus	Huawei Local Security Checks	critical
103061	EulerOS 2.0 SP1 : gnutls (EulerOS-SA-2017-1203)	Nessus	Huawei Local Security Checks	critical
102759	CentOS 7 : gnutls (CESA-2017:2292)	Nessus	CentOS Local Security Checks	critical
102642	Scientific Linux Security Update : gnutls on SL7.x x86_64 (20170801)	Nessus	Scientific Linux Local Security Checks	critical
102303	Oracle Linux 7 : gnutls (ELSA-2017-2292)	Nessus	Oracle Linux Local Security Checks	critical
102116	RHEL 7 : gnutls (RHSA-2017:2292)	Nessus	Red Hat Local Security Checks	critical
101759	openSUSE Security Update : gnutls (openSUSE-2017-824)	Nessus	SuSE Local Security Checks	high
101746	Fedora 26 : gnutls (2017-f0d48eabe6)	Nessus	Fedora Local Security Checks	high
101660	Fedora 26 : mingw-gnutls (2017-7936341c80)	Nessus	Fedora Local Security Checks	high
101393	SUSE SLED12 / SLES12 Security Update : gnutls (SUSE-SU-2017:1838-1)	Nessus	SuSE Local Security Checks	high
100852	Debian DSA-3884-1 : gnutls28 - security update	Nessus	Debian Local Security Checks	high
100781	Ubuntu 14.04 LTS / 16.04 LTS : GnuTLS vulnerabilities (USN-3318-1)	Nessus	Ubuntu Local Security Checks	high
100736	Fedora 25 : gnutls (2017-f646217583)	Nessus	Fedora Local Security Checks	high

Detections

Analytics

CVE-2017-7507

high

Tenable Plugins

high

high

critical

critical

critical

critical

critical

critical

high

high

high

high

high

high

high