Double free vulnerability in the gnutls_x509_ext_import_proxy function in GnuTLS before 3.3.26 and 3.5.x before 3.5.8 allows remote attackers to have unspecified impact via crafted policy language information in an X.509 certificate with a Proxy Certificate Information extension.

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)

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2017-2292 advisory.

    - Address crash in OCSP status request extension, by eliminating the       unneeded parsing (CVE-2017-7507, #1455828)

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

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

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2017:2292 advisory.

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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

The remote host is affected by the vulnerability described in GLSA-201702-04 (GnuTLS: Multiple vulnerabilities)

    Multiple heap and stack overflows and double free vulnerabilities have       been discovered in GnuTLS by the OSS-Fuzz project. Please review the CVE       identifiers referenced below for details.
  Impact :

    A remote attacker could entice a user or automated system to process a       specially crafted certificate using an application linked against GnuTLS.
      This could possibly result in the execution of arbitrary code with the       privileges of the process or a Denial of Service condition.
  Workaround :

    There is no known workaround at this time.

The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3183-1 advisory.

    Stefan Buehler discovered that GnuTLS incorrectly verified the serial length of OCSP responses. A remote     attacker could possibly use this issue to bypass certain certificate validation measures. This issue only     applied to Ubuntu 16.04 LTS. (CVE-2016-7444)

    Shi Lei discovered that GnuTLS incorrectly handled certain warning alerts. A remote attacker could     possibly use this issue to cause GnuTLS to hang, resulting in a denial of service. This issue has only     been addressed in Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2016-8610)

    It was discovered that GnuTLS incorrectly decoded X.509 certificates with a Proxy Certificate Information     extension. A remote attacker could use this issue to cause GnuTLS to crash, resulting in a denial of     service, or possibly execute arbitrary code. This issue only affected Ubuntu 16.04 LTS and Ubuntu 16.10.
    (CVE-2017-5334)

    It was discovered that GnuTLS incorrectly handled certain OpenPGP certificates. A remote attacker could     possibly use this issue to cause GnuTLS to crash, resulting in a denial of service, or possibly execute     arbitrary code. (CVE-2017-5335, CVE-2017-5336, CVE-2017-5337)

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.

Security fix for CVE-2017-5337, CVE-2017-5334, CVE-2017-5336, CVE-2017-5335

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.

New gnutls packages are available for Slackware 14.0, 14.1, 14.2, and
-current to fix security issues.

ID	Name	Product	Family	Severity
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
97110	GLSA-201702-04 : GnuTLS: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	critical
96952	Ubuntu 14.04 LTS / 16.04 LTS : GnuTLS vulnerabilities (USN-3183-1)	Nessus	Ubuntu Local Security Checks	critical
96507	Fedora 24 : gnutls (2017-e86817c42e)	Nessus	Fedora Local Security Checks	critical
96408	Slackware 14.0 / 14.1 / 14.2 / current : gnutls (SSA:2017-011-02)	Nessus	Slackware Local Security Checks	critical

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