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RHEL 6 : glibc (RHSA-2016:0175)

high Nessus Plugin ID 88784

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Synopsis

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

Description

Updated glibc packages that fix one security issue and two bugs are now available for Red Hat Enterprise Linux 6.

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.

This update also fixes the following bugs :

* The dynamic loader has been enhanced to allow the loading of more shared libraries that make use of static thread local storage. While static thread local storage is the fastest access mechanism it may also prevent the shared library from being loaded at all since the static storage space is a limited and shared process-global resource.
Applications which would previously fail with 'dlopen: cannot load any more object with static TLS' should now start up correctly.
(BZ#1291270)

* A bug in the POSIX realtime support would cause asynchronous I/O or certain timer API calls to fail and return errors in the presence of large thread-local storage data that exceeded PTHREAD_STACK_MIN in size (generally 16 KiB). The bug in librt has been corrected and the impacted APIs no longer return errors when large thread-local storage data is present in the application. (BZ#1301625)

All glibc users are advised to upgrade to these updated packages, which contain backported patches to correct these issues.

Solution

Update the affected packages.

See Also

https://access.redhat.com/articles/2161461

https://access.redhat.com/errata/RHSA-2016:0175

https://access.redhat.com/security/cve/cve-2015-7547

https://www.tenable.com/security/research/tra-2017-08

Plugin Details

Severity: High

ID: 88784

File Name: redhat-RHSA-2016-0175.nasl

Version: 2.21

Type: local

Agent: unix

Published: 2/17/2016

Updated: 10/24/2019

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.4

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.8

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

CVSS v3

Risk Factor: High

Base Score: 8.1

Temporal Score: 7.3

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

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:glibc-headers, cpe:/o:redhat:enterprise_linux:6, p-cpe:/a:redhat:enterprise_linux:glibc-debuginfo-common, p-cpe:/a:redhat:enterprise_linux:glibc-debuginfo, p-cpe:/a:redhat:enterprise_linux:glibc-common, p-cpe:/a:redhat:enterprise_linux:glibc-devel, p-cpe:/a:redhat:enterprise_linux:glibc-static, p-cpe:/a:redhat:enterprise_linux:glibc-utils, cpe:/o:redhat:enterprise_linux:6.7, p-cpe:/a:redhat:enterprise_linux:glibc, p-cpe:/a:redhat:enterprise_linux:nscd

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: 2/16/2016

Vulnerability Publication Date: 2/18/2016

Reference Information

CVE: CVE-2015-7547