Sigurnosni nedostaci programskog paketa glibc

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Red Hat Security Advisory

Synopsis: Moderate: glibc security and bug fix update
Advisory ID: RHSA-2015:0327-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-0327.html
Issue date: 2015-03-05
CVE Names: CVE-2014-6040 CVE-2014-8121
=====================================================================

1. Summary:

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.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Client (v. 7) – x86_64
Red Hat Enterprise Linux Client Optional (v. 7) – x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) – x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) – x86_64
Red Hat Enterprise Linux Server (v. 7) – ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) – ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 7) – x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) – x86_64

3. Description:

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.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1103874 – Fix memory fencing error in unwind-forcedunwind.c
1124453 – getconf PATH returns non-directory “/bin”
1135841 – CVE-2014-6040 glibc: crash in code page decoding functions (IBM933, IBM935, IBM937, IBM939, IBM1364)
1138520 – nscd segfaults when running sudo with netgroup caching enabled.
1165192 – CVE-2014-8121 glibc: Unexpected closing of nss_files databases after lookups causes denial of service

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
glibc-2.17-78.el7.src.rpm

x86_64:
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-debuginfo-2.17-78.el7.i686.rpm
glibc-debuginfo-2.17-78.el7.x86_64.rpm
glibc-debuginfo-common-2.17-78.el7.i686.rpm
glibc-debuginfo-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-utils-2.17-78.el7.x86_64.rpm
nscd-2.17-78.el7.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

x86_64:
glibc-debuginfo-2.17-78.el7.i686.rpm
glibc-debuginfo-2.17-78.el7.x86_64.rpm
glibc-debuginfo-common-2.17-78.el7.i686.rpm
glibc-debuginfo-common-2.17-78.el7.x86_64.rpm
glibc-static-2.17-78.el7.i686.rpm
glibc-static-2.17-78.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
glibc-2.17-78.el7.src.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

Red Hat Enterprise Linux Server (v. 7):

Source:
glibc-2.17-78.el7.src.rpm

ppc64:
glibc-2.17-78.el7.ppc.rpm
glibc-2.17-78.el7.ppc64.rpm
glibc-common-2.17-78.el7.ppc64.rpm
glibc-debuginfo-2.17-78.el7.ppc.rpm
glibc-debuginfo-2.17-78.el7.ppc64.rpm
glibc-debuginfo-common-2.17-78.el7.ppc.rpm
glibc-debuginfo-common-2.17-78.el7.ppc64.rpm
glibc-devel-2.17-78.el7.ppc.rpm
glibc-devel-2.17-78.el7.ppc64.rpm
glibc-headers-2.17-78.el7.ppc64.rpm
glibc-utils-2.17-78.el7.ppc64.rpm
nscd-2.17-78.el7.ppc64.rpm

s390x:
glibc-2.17-78.el7.s390.rpm
glibc-2.17-78.el7.s390x.rpm
glibc-common-2.17-78.el7.s390x.rpm
glibc-debuginfo-2.17-78.el7.s390.rpm
glibc-debuginfo-2.17-78.el7.s390x.rpm
glibc-debuginfo-common-2.17-78.el7.s390.rpm
glibc-debuginfo-common-2.17-78.el7.s390x.rpm
glibc-devel-2.17-78.el7.s390.rpm
glibc-devel-2.17-78.el7.s390x.rpm
glibc-headers-2.17-78.el7.s390x.rpm
glibc-utils-2.17-78.el7.s390x.rpm
nscd-2.17-78.el7.s390x.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

ppc64:
glibc-debuginfo-2.17-78.el7.ppc.rpm
glibc-debuginfo-2.17-78.el7.ppc64.rpm
glibc-debuginfo-common-2.17-78.el7.ppc.rpm
glibc-debuginfo-common-2.17-78.el7.ppc64.rpm
glibc-static-2.17-78.el7.ppc.rpm
glibc-static-2.17-78.el7.ppc64.rpm

s390x:
glibc-debuginfo-2.17-78.el7.s390.rpm
glibc-debuginfo-2.17-78.el7.s390x.rpm
glibc-debuginfo-common-2.17-78.el7.s390.rpm
glibc-debuginfo-common-2.17-78.el7.s390x.rpm
glibc-static-2.17-78.el7.s390.rpm
glibc-static-2.17-78.el7.s390x.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
glibc-2.17-78.el7.src.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2014-6040
https://access.redhat.com/security/cve/CVE-2014-8121
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

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