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CVE-2016-7444

Status Candidate

Overview

The gnutls_ocsp_resp_check_crt function in lib/x509/ocsp.c in GnuTLS before 3.4.15 and 3.5.x before 3.5.4 does not verify the serial length of an OCSP response, which might allow remote attackers to bypass an intended certificate validation mechanism via vectors involving trailing bytes left by gnutls_malloc.

Related Files

Red Hat Security Advisory 2017-2292-01
Posted Aug 1, 2017
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2017-2292-01 - The gnutls packages provide the GNU Transport Layer Security 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. Security Fix: 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.

tags | advisory, protocol
systems | linux, redhat
advisories | CVE-2016-7444, CVE-2017-5334, CVE-2017-5335, CVE-2017-5336, CVE-2017-5337, CVE-2017-7507, CVE-2017-7869
MD5 | f227c7d31318a48f851ed0cfcb016a0e
Ubuntu Security Notice USN-3183-2
Posted Mar 20, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3183-2 - USN-3183-1 fixedCVE-2016-8610 in GnuTLS in Ubuntu 16.04 LTS and Ubuntu 16.10. This update provides the corresponding update for Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. 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. 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. 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. 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. Various other issues were also addressed.

tags | advisory, remote, denial of service, arbitrary
systems | linux, ubuntu
advisories | CVE-2016-7444, CVE-2016-8610, CVE-2017-5334
MD5 | 8dd6cf3f82573896a95e04e77518fa09
Ubuntu Security Notice USN-3183-1
Posted Feb 2, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3183-1 - 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. 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. Various other issues were also addressed.

tags | advisory, remote, denial of service
systems | linux, ubuntu
advisories | CVE-2016-7444, CVE-2016-8610, CVE-2017-5334, CVE-2017-5335, CVE-2017-5336, CVE-2017-5337
MD5 | 2cc5efe59d2477e19930f66c4a862855
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