Moderate CentOS glibc Security Update


glibc-2.17-78.el7.i686.rpm, glibc-2.17-78.el7.x86_64.rpm, glibc-common-2.17-78.el7.x86_64.rpm, glibc-devel-2.17-78.el7.i686.rpm, glibc-devel-2.17-78.el7.x86_64.rpm, glibc-headers-2.17-78.el7.x86_64.rpm, glibc-static-2.17-78.el7.i686.rpm, glibc-static-2.17-78.el7.x86_64.rpm, glibc-utils-2.17-78.el7.x86_64.rpm, nscd-2.17-78.el7.x86_64.rpm,
2018-01-18 11:09
2017-07-27 19:08
2017-04-01 19:08
2017-01-05 20:12


Updated glibc packages that fix two security issues and several bugs 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.

An out-of-bounds read flaw was found in the way glibc's iconv() function
converted certain encoded data to UTF-8. An attacker able to make an
application call the iconv() function with a specially crafted argument
could use this flaw to crash that application. (CVE-2014-6040)

It was found that the files back end of Name Service Switch (NSS) did not
isolate iteration over an entire database from key-based look-up API calls.
An application performing look-ups on a database while iterating over it
could enter an infinite loop, leading to a denial of service.

This update also fixes the following bugs:

* Due to problems with buffer extension and reallocation, the nscd daemon
terminated unexpectedly with a segmentation fault when processing long
netgroup entries. With this update, the handling of long netgroup entries
has been corrected and nscd no longer crashes in the described scenario.

* If a file opened in append mode was truncated with the ftruncate()
function, a subsequent ftell() call could incorrectly modify the file
offset. This update ensures that ftell() modifies the stream state only
when it is in append mode and the buffer for the stream is not empty.

* A defect in the C library headers caused builds with older compilers to
generate incorrect code for the btowc() function in the older compatibility C++ standard library. Applications calling btowc() in the compatibility C++ standard library became unresponsive. With this update, the C library headers have been corrected, and the compatibility C++ standard library shipped with Red Hat Enterprise Linux has been rebuilt. Applications that rely on the compatibility C++ standard library no longer hang when calling btowc(). (BZ#1120490)

* Previously, when using netgroups and the nscd daemon was set up to cache netgroup information, the sudo utility denied access to valid users. The bug in nscd has been fixed, and sudo now works in netgroups as
expected. (BZ#1080766)

Users of glibc are advised to upgrade to these updated packages, which fix these issues.
Please see

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Affected package information

Release Package Patched in
7 glibc glibc-2.17-78.el7.i686.rpm
glibc glibc-2.17-78.el7.x86_64.rpm
glibc-common glibc-common-2.17-78.el7.x86_64.rpm
glibc-devel glibc-devel-2.17-78.el7.i686.rpm
glibc-devel glibc-devel-2.17-78.el7.x86_64.rpm
glibc-headers glibc-headers-2.17-78.el7.x86_64.rpm
glibc-static glibc-static-2.17-78.el7.i686.rpm
glibc-static glibc-static-2.17-78.el7.x86_64.rpm
glibc-utils glibc-utils-2.17-78.el7.x86_64.rpm
nscd nscd-2.17-78.el7.x86_64.rpm