RHEL 6 / 7 : glibc (RHSA-2016:0225)

Critical Nessus Plugin ID 88793


The remote Red Hat host is missing one or more security updates.


Updated glibc packages that fix one security issue are now available for Red Hat Enterprise Linux 6.2, 6.4, and 6.5 Advanced Update Support, and Red Hat Enterprise Linux 6.6 and 7.1 Extended Update Support.

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

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 stack-based buffer overflow was found in the way the libresolv library performed dual A/AAAA DNS queries. A remote attacker could create a specially crafted DNS response which could cause libresolv to crash or, potentially, execute code with the permissions of the user running the library. Note: this issue is only exposed when libresolv is called from the nss_dns NSS service module. (CVE-2015-7547)

This issue was discovered by the Google Security Team and Red Hat.

All glibc users are advised to upgrade to these updated packages, which contain a backported patch to correct this issue.


Update the affected packages.

See Also





Plugin Details

Severity: Critical

ID: 88793

File Name: redhat-RHSA-2016-0225.nasl

Version: $Revision: 2.14 $

Type: local

Agent: unix

Published: 2016/02/17

Modified: 2017/01/27

Dependencies: 12634

Risk Information

Risk Factor: Critical


Base Score: 10

Temporal Score: 8.3

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Temporal Vector: CVSS2#E:F/RL:OF/RC:ND


Base Score: 8.1

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:glibc, p-cpe:/a:redhat:enterprise_linux:glibc-common, p-cpe:/a:redhat:enterprise_linux:glibc-debuginfo, p-cpe:/a:redhat:enterprise_linux:glibc-debuginfo-common, p-cpe:/a:redhat:enterprise_linux:glibc-devel, p-cpe:/a:redhat:enterprise_linux:glibc-headers, p-cpe:/a:redhat:enterprise_linux:glibc-static, p-cpe:/a:redhat:enterprise_linux:glibc-utils, p-cpe:/a:redhat:enterprise_linux:nscd, cpe:/o:redhat:enterprise_linux:6.2, cpe:/o:redhat:enterprise_linux:6.4, cpe:/o:redhat:enterprise_linux:6.5, cpe:/o:redhat:enterprise_linux:6.6, cpe:/o:redhat:enterprise_linux:7.1

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2016/02/16

Reference Information

CVE: CVE-2015-7547

OSVDB: 134584

RHSA: 2016:0225

IAVA: 2016-A-0053

TRA: TRA-2017-08