Moderate CentOS glibc Security Update

Metadata

medium
4.6
glibc-2.17-55.el7_0.3.i686.rpm, glibc-2.17-55.el7_0.3.src.rpm, glibc-2.17-55.el7_0.3.x86_64.rpm, glibc-common-2.17-55.el7_0.3.x86_64.rpm, glibc-devel-2.17-55.el7_0.3.i686.rpm, glibc-devel-2.17-55.el7_0.3.x86_64.rpm, glibc-headers-2.17-55.el7_0.3.x86_64.rpm, glibc-static-2.17-55.el7_0.3.i686.rpm, glibc-static-2.17-55.el7_0.3.x86_64.rpm, glibc-utils-2.17-55.el7_0.3.x86_64.rpm, nscd-2.17-55.el7_0.3.x86_64.rpm
CVE-2014-7817
rhn.redhat.com, lists.centos.org
2014-12-19
2017-07-27 19:08
ALAS-2015-468
Moderate CentOS glibc Security Update
CVE-2014-7817 eglibc
CVE-2014-7817 glibc
CVE-2014-7817
2017-04-01 19:08
2017-01-05 20:12

Description


Updated glibc packages that fix one security issue and one bug are now
available for Red Hat Enterprise Linux 7.

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.

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.

It was found that the wordexp() function would perform command substitution
even when the WRDE_NOCMD flag was specified. An attacker able to provide
specially crafted input to an application using the wordexp() function, and
not sanitizing the input correctly, could potentially use this flaw to
execute arbitrary commands with the credentials of the user running that
application. (CVE-2014-7817)

This issue was discovered by Tim Waugh of the Red Hat Developer Experience
Team.

This update also fixes the following bug:

* Prior to this update, if a file stream that was opened in append mode and
its underlying file descriptor were used at the same time and the file was
truncated using the ftruncate() function on the file descriptor, a
subsequent ftell() call on the stream incorrectly modified the file offset
by seeking to the new end of the file. This update ensures that ftell()
modifies the state of the file stream only when it is in append mode and
its buffer is not empty. As a result, the described incorrect changes to
the file offset no longer occur. (BZ#1170187)

All glibc users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues.
Please see https://www.redhat.com/footer/terms-of-use.html

Am I vulnerable?

The constraints below list the versions that this vulnerability is patched in, and versions that are unaffected. If a patch is ready but unrealeased, then it is pending.

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Affected package information

Release Package Patched in
7 glibc glibc-2.17-55.el7_0.3.i686.rpm
glibc glibc-2.17-55.el7_0.3.src.rpm
glibc glibc-2.17-55.el7_0.3.x86_64.rpm
glibc-common glibc-common-2.17-55.el7_0.3.x86_64.rpm
glibc-devel glibc-devel-2.17-55.el7_0.3.i686.rpm
glibc-devel glibc-devel-2.17-55.el7_0.3.x86_64.rpm
glibc-headers glibc-headers-2.17-55.el7_0.3.x86_64.rpm
glibc-static glibc-static-2.17-55.el7_0.3.i686.rpm
glibc-static glibc-static-2.17-55.el7_0.3.x86_64.rpm
glibc-utils glibc-utils-2.17-55.el7_0.3.x86_64.rpm
nscd nscd-2.17-55.el7_0.3.x86_64.rpm