glibc, nscd security update

CentOS Errata and Security Advisory CESA-2015:0327

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.
(CVE-2014-8121)

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.
  (BZ#1138520)

• 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.
  (BZ#1156331)

• 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.

Merged security bulletin from advisories:
https://lists.centos.org/pipermail/centos-cr-announce/2015-March/027826.html

Affected packages:
glibc
glibc-common
glibc-devel
glibc-headers
glibc-static
glibc-utils
nscd

Upstream details at:
https://access.redhat.com/errata/RHSA-2015:0327