Executive Summary

Summary
Title gnutls security and bug fix update
Informations
Name RHSA-2015:1457 First vendor Publication 2015-07-22
Vendor RedHat Last vendor Modification 2015-07-22
Severity (Vendor) Moderate Revision 01

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
 
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:N/I:P/A:N)
Cvss Base Score 5 Attack Range Network
Cvss Impact Score 2.9 Attack Complexity Low
Cvss Expoit Score 10 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

Problem Description:

Updated gnutls packages that fix three security issues and one bug are now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64 Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64 Red Hat Enterprise Linux HPC Node (v. 6) - x86_64 Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64 Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64 Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64 Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64

3. Description:

The GnuTLS library provides support for cryptographic algorithms and for protocols such as Transport Layer Security (TLS).

It was found that GnuTLS did not check activation and expiration dates of CA certificates. This could cause an application using GnuTLS to incorrectly accept a certificate as valid when its issuing CA is already expired. (CVE-2014-8155)

It was found that GnuTLS did not verify whether a hashing algorithm listed in a signature matched the hashing algorithm listed in the certificate. An attacker could create a certificate that used a different hashing algorithm than it claimed, possibly causing GnuTLS to use an insecure, disallowed hashing algorithm during certificate verification. (CVE-2015-0282)

It was discovered that GnuTLS did not check if all sections of X.509 certificates indicate the same signature algorithm. This flaw, in combination with a different flaw, could possibly lead to a bypass of the certificate signature check. (CVE-2015-0294)

The CVE-2014-8155 issue was discovered by Marcel Kolaja of Red Hat. The CVE-2015-0282 and CVE-2015-0294 issues were discovered by Nikos Mavrogiannopoulos of the Red Hat Security Technologies Team.

This update also fixes the following bug:

* Previously, under certain circumstances, the certtool utility could generate X.509 certificates which contained a negative modulus. Consequently, such certificates could have interoperation problems with the software using them. The bug has been fixed, and certtool no longer generates X.509 certificates containing a negative modulus. (BZ#1036385)

Users of gnutls are advised to upgrade to these updated packages, which contain backported patches to correct these issues.

4. Solution:

Before applying this update, make sure all previously released errata relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1036385 - Certtool generates x509 certificates which contain negative modulus 1194371 - CVE-2015-0282 gnutls: RSA PKCS#1 signature verification forgery 1196323 - CVE-2015-0294 gnutls: certificate algorithm consistency checking issue 1197995 - CVE-2014-8155 gnutls: gnutls does not perform date/time checks on CA certificates

Original Source

Url : https://rhn.redhat.com/errata/RHSA-2015-1457.html

CWE : Common Weakness Enumeration

% Id Name
50 % CWE-310 Cryptographic Issues
50 % CWE-17 Code

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 178

Nessus® Vulnerability Scanner

Date Description
2015-09-29 Name : The remote device is missing a vendor-supplied security patch.
File : f5_bigip_SOL17327.nasl - Type : ACT_GATHER_INFO
2015-08-05 Name : The remote Amazon Linux AMI host is missing a security update.
File : ala_ALAS-2015-575.nasl - Type : ACT_GATHER_INFO
2015-08-04 Name : The remote Scientific Linux host is missing one or more security updates.
File : sl_20150722_gnutls_on_SL6_x.nasl - Type : ACT_GATHER_INFO
2015-07-31 Name : The remote OracleVM host is missing a security update.
File : oraclevm_OVMSA-2015-0101.nasl - Type : ACT_GATHER_INFO
2015-07-30 Name : The remote Oracle Linux host is missing one or more security updates.
File : oraclelinux_ELSA-2015-1457.nasl - Type : ACT_GATHER_INFO
2015-07-28 Name : The remote CentOS host is missing one or more security updates.
File : centos_RHSA-2015-1457.nasl - Type : ACT_GATHER_INFO
2015-07-23 Name : The remote Red Hat host is missing one or more security updates.
File : redhat-RHSA-2015-1457.nasl - Type : ACT_GATHER_INFO
2015-04-08 Name : The remote SuSE 11 host is missing one or more security updates.
File : suse_11_gnutls-150325.nasl - Type : ACT_GATHER_INFO
2015-03-26 Name : The remote Debian host is missing a security update.
File : debian_DLA-180.nasl - Type : ACT_GATHER_INFO
2015-03-24 Name : The remote Ubuntu host is missing one or more security-related patches.
File : ubuntu_USN-2540-1.nasl - Type : ACT_GATHER_INFO
2015-03-17 Name : The remote Debian host is missing a security-related update.
File : debian_DSA-3191.nasl - Type : ACT_GATHER_INFO

Alert History

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Date Informations
2015-12-05 13:28:11
  • Multiple Updates
2015-08-15 00:30:23
  • Multiple Updates
2015-08-12 13:33:36
  • Multiple Updates
2015-07-31 13:29:11
  • Multiple Updates
2015-07-24 13:30:06
  • Multiple Updates
2015-07-22 09:24:28
  • First insertion