Executive Summary

Summary
Title glibc security and bug fix update
Informations
Name RHSA-2015:0863 First vendor Publication 2015-04-21
Vendor RedHat Last vendor Modification 2015-04-21
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:M/Au:N/C:P/I:P/A:P)
Cvss Base Score 6.8 Attack Range Network
Cvss Impact Score 6.4 Attack Complexity Medium
Cvss Expoit Score 8.6 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

Problem Description:

Updated glibc packages that fix two 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 glibc packages provide the standard C libraries (libc), POSIX thread libraries (libpthread), standard math libraries (libm), and the Name Server Caching Daemon (nscd) used by multiple programs on the system. Without these libraries, the Linux system cannot function correctly.

A buffer overflow flaw was found in the way glibc's gethostbyname_r() and other related functions computed the size of a buffer when passed a misaligned buffer as input. An attacker able to make an application call any of these functions with a misaligned buffer could use this flaw to crash the application or, potentially, execute arbitrary code with the permissions of the user running the application. (CVE-2015-1781)

It was discovered that, under certain circumstances, glibc's getaddrinfo() function would send DNS queries to random file descriptors. An attacker could potentially use this flaw to send DNS queries to unintended recipients, resulting in information disclosure or data loss due to the application encountering corrupted data. (CVE-2013-7423)

The CVE-2015-1781 issue was discovered by Arjun Shankar of Red Hat.

This update also fixes the following bug:

* Previously, the nscd daemon did not properly reload modified data when the user edited monitored nscd configuration files. As a consequence, nscd returned stale data to system processes. This update adds a system of inotify-based monitoring and stat-based backup monitoring for nscd configuration files. As a result, nscd now detects changes to its configuration files and reloads the data properly, which prevents it from returning stale data. (BZ#1194149)

All glibc users 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/):

1187109 - CVE-2013-7423 glibc: getaddrinfo() writes DNS queries to random file descriptors under high load 1199525 - CVE-2015-1781 glibc: buffer overflow in gethostbyname_r() and related functions with misaligned buffer

Original Source

Url : https://rhn.redhat.com/errata/RHSA-2015-0863.html

CWE : Common Weakness Enumeration

% Id Name
50 % CWE-119 Failure to Constrain Operations within the Bounds of a Memory Buffer
50 % CWE-17 Code

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 117
Application 2
Os 5
Os 1
Os 2
Os 1
Os 1
Os 2
Os 2

Nessus® Vulnerability Scanner

Date Description
2016-06-07 Name : The remote Red Hat host is missing one or more security updates.
File : redhat-RHSA-2016-1207.nasl - Type : ACT_GATHER_INFO
2016-05-27 Name : The remote Ubuntu host is missing one or more security-related patches.
File : ubuntu_USN-2985-2.nasl - Type : ACT_GATHER_INFO
2016-05-26 Name : The remote Ubuntu host is missing one or more security-related patches.
File : ubuntu_USN-2985-1.nasl - Type : ACT_GATHER_INFO
2016-03-04 Name : The remote Fedora host is missing a security update.
File : fedora_2016-0480defc94.nasl - Type : ACT_GATHER_INFO
2016-02-18 Name : The remote SUSE host is missing one or more security updates.
File : suse_SU-2016-0470-1.nasl - Type : ACT_GATHER_INFO
2016-02-18 Name : The remote Gentoo host is missing one or more security-related patches.
File : gentoo_GLSA-201602-02.nasl - Type : ACT_GATHER_INFO
2016-02-17 Name : The remote OracleVM host is missing one or more security updates.
File : oraclevm_OVMSA-2016-0013.nasl - Type : ACT_GATHER_INFO
2016-02-17 Name : The remote Debian host is missing a security-related update.
File : debian_DSA-3480.nasl - Type : ACT_GATHER_INFO
2016-02-04 Name : The remote Red Hat host is missing one or more security updates.
File : redhat-RHSA-2015-2589.nasl - Type : ACT_GATHER_INFO
2015-12-22 Name : The remote Scientific Linux host is missing one or more security updates.
File : sl_20151119_glibc_on_SL7_x.nasl - Type : ACT_GATHER_INFO
2015-12-15 Name : The remote Amazon Linux AMI host is missing a security update.
File : ala_ALAS-2015-617.nasl - Type : ACT_GATHER_INFO
2015-12-02 Name : The remote CentOS host is missing one or more security updates.
File : centos_RHSA-2015-2199.nasl - Type : ACT_GATHER_INFO
2015-11-30 Name : The remote Oracle Linux host is missing one or more security updates.
File : oraclelinux_ELSA-2015-2199.nasl - Type : ACT_GATHER_INFO
2015-11-19 Name : The remote Red Hat host is missing one or more security updates.
File : redhat-RHSA-2015-2199.nasl - Type : ACT_GATHER_INFO
2015-11-02 Name : The remote SUSE host is missing one or more security updates.
File : suse_SU-2015-1844-1.nasl - Type : ACT_GATHER_INFO
2015-08-25 Name : The remote SUSE host is missing one or more security updates.
File : suse_SU-2015-1424-1.nasl - Type : ACT_GATHER_INFO
2015-05-28 Name : The remote openSUSE host is missing a security update.
File : openSUSE-2015-383.nasl - Type : ACT_GATHER_INFO
2015-05-28 Name : The remote Debian host is missing a security update.
File : debian_DLA-230.nasl - Type : ACT_GATHER_INFO
2015-05-20 Name : The remote SUSE host is missing one or more security updates.
File : suse_SU-2015-0551-1.nasl - Type : ACT_GATHER_INFO
2015-05-20 Name : The remote SUSE host is missing one or more security updates.
File : suse_SU-2015-0550-1.nasl - Type : ACT_GATHER_INFO
2015-05-20 Name : The remote SUSE host is missing one or more security updates.
File : suse_SU-2015-0526-1.nasl - Type : ACT_GATHER_INFO
2015-05-01 Name : The remote Mandriva Linux host is missing one or more security updates.
File : mandriva_MDVSA-2015-218.nasl - Type : ACT_GATHER_INFO
2015-04-27 Name : The remote Amazon Linux AMI host is missing a security update.
File : ala_ALAS-2015-513.nasl - Type : ACT_GATHER_INFO
2015-04-22 Name : The remote Scientific Linux host is missing one or more security updates.
File : sl_20150421_glibc_on_SL6_x.nasl - Type : ACT_GATHER_INFO
2015-04-22 Name : The remote Red Hat host is missing one or more security updates.
File : redhat-RHSA-2015-0863.nasl - Type : ACT_GATHER_INFO
2015-04-22 Name : The remote OracleVM host is missing one or more security updates.
File : oraclevm_OVMSA-2015-0055.nasl - Type : ACT_GATHER_INFO
2015-04-22 Name : The remote Oracle Linux host is missing one or more security updates.
File : oraclelinux_ELSA-2015-0863.nasl - Type : ACT_GATHER_INFO
2015-04-22 Name : The remote CentOS host is missing one or more security updates.
File : centos_RHSA-2015-0863.nasl - Type : ACT_GATHER_INFO
2015-03-26 Name : The remote Debian host is missing a security update.
File : debian_DLA-165.nasl - Type : ACT_GATHER_INFO
2015-03-06 Name : The remote SuSE 11 host is missing one or more security updates.
File : suse_11_glibc-150226.nasl - Type : ACT_GATHER_INFO
2015-02-27 Name : The remote openSUSE host is missing a security update.
File : openSUSE-2015-173.nasl - Type : ACT_GATHER_INFO
2015-02-27 Name : The remote Ubuntu host is missing a security-related patch.
File : ubuntu_USN-2519-1.nasl - Type : ACT_GATHER_INFO

Alert History

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Date Informations
2015-12-05 13:27:58
  • Multiple Updates
2015-09-29 21:22:49
  • Multiple Updates
2015-09-29 05:26:20
  • Multiple Updates
2015-06-04 09:32:24
  • Multiple Updates
2015-05-02 13:26:29
  • Multiple Updates
2015-04-28 13:33:35
  • Multiple Updates
2015-04-23 13:30:44
  • Multiple Updates
2015-04-21 17:25:07
  • First insertion