Detections
Analytics
CentOS 7 : glibc (CESA-2016:0176)
high Nessus Plugin ID 88758
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Synopsis
The remote CentOS host is missing one or more security updates.Description
Updated glibc packages that fix two security issues and two bugs are now available for Red Hat Enterprise Linux 7.Red Hat Product Security has rated this update as having Critical 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.
The glibc packages provide the standard C libraries (libc), POSIX thread libraries (libpthread), standard math libraries (libm), and the name service cache 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)
It was discovered that the calloc implementation in glibc could return memory areas which contain non-zero bytes. This could result in unexpected application behavior such as hangs or crashes.
(CVE-2015-5229)
The CVE-2015-7547 issue was discovered by the Google Security Team and Red Hat. Red Hat would like to thank Jeff Layton for reporting the CVE-2015-5229 issue.
This update also fixes the following bugs :
* The existing implementation of the 'free' function causes all memory pools beyond the first to return freed memory directly to the operating system as quickly as possible. This can result in performance degradation when the rate of free calls is very high. The first memory pool (the main pool) does provide a method to rate limit the returns via M_TRIM_THRESHOLD, but this method is not available to subsequent memory pools.
With this update, the M_TRIM_THRESHOLD method is extended to apply to all memory pools, which improves performance for threads with very high amounts of free calls and limits the number of 'madvise' system calls. The change also increases the total transient memory usage by processes because the trim threshold must be reached before memory can be freed.
To return to the previous behavior, you can either set M_TRIM_THRESHOLD using the 'mallopt' function, or set the MALLOC_TRIM_THRESHOLD environment variable to 0. (BZ#1298930)
* On the little-endian variant of 64-bit IBM Power Systems (ppc64le), a bug in the dynamic loader could cause applications compiled with profiling enabled to fail to start with the error 'monstartup: out of memory'. The bug has been corrected and applications compiled for profiling now start correctly. (BZ#1298956)
All glibc users are advised to upgrade to these updated packages, which contain backported patches to correct these issues.
Solution
Update the affected glibc packages.See Also
Plugin Details
Severity: High
ID: 88758
File Name: centos_RHSA-2016-0176.nasl
Version: 2.23
Type: local
Agent: unix
Family: CentOS Local Security Checks
Published: 2/17/2016
Updated: 6/18/2024
Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment 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 Score Source: CVE-2015-7547
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:centos:centos:glibc, cpe:/o:centos:centos:7, p-cpe:/a:centos:centos:glibc-headers, p-cpe:/a:centos:centos:glibc-static, p-cpe:/a:centos:centos:glibc-devel, p-cpe:/a:centos:centos:glibc-utils, p-cpe:/a:centos:centos:nscd, p-cpe:/a:centos:centos:glibc-common
Required KB Items: Host/local_checks_enabled, Host/CentOS/release, Host/CentOS/rpm-list
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 2/16/2016
Vulnerability Publication Date: 2/18/2016
Reference Information
CVE: CVE-2015-5229, CVE-2015-7547