[RHSA-2013:0522-02] Moderate: gdb security and bug fix update

Thu Feb 21 06:40:05 UTC 2013

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                   Red Hat Security Advisory

Synopsis:          Moderate: gdb security and bug fix update
Advisory ID:       RHSA-2013:0522-02
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2013-0522.html
Issue date:        2013-02-21
CVE Names:         CVE-2011-4355 
=====================================================================

1. Summary:

Updated gdb packages that fix one security issue and three bugs are now
available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having moderate
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link in
the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

3. Description:

The GNU Debugger (GDB) allows debugging of programs written in C, C++,
Java, and other languages by executing them in a controlled fashion and
then printing out their data.

GDB tried to auto-load certain files (such as GDB scripts, Python scripts,
and a thread debugging library) from the current working directory when
debugging programs. This could result in the execution of arbitrary code
with the user's privileges when GDB was run in a directory that has
untrusted content. (CVE-2011-4355)

With this update, GDB no longer auto-loads files from the current directory
and only trusts certain system directories by default. The list of trusted
directories can be viewed and modified using the "show auto-load safe-path"
and "set auto-load safe-path" GDB commands. Refer to the GDB manual, linked
to in the References, for further information.

This update also fixes the following bugs:

* When a struct member was at an offset greater than 256 MB, the resulting
bit position within the struct overflowed and caused an invalid memory
access by GDB. With this update, the code has been modified to ensure that
GDB can access such positions. (BZ#795424)

* When a thread list of the core file became corrupted, GDB did not print
this list but displayed the "Cannot find new threads: generic error" error
message instead. With this update, GDB has been modified and it now prints
the thread list of the core file as expected. (BZ#811648)

* GDB did not properly handle debugging of multiple binaries with the
same build ID. This update modifies GDB to use symbolic links created for
particular binaries so that debugging of binaries that share a build ID
now proceeds as expected. Debugging of live programs and core files is
now more user-friendly. (BZ#836966)

All users of gdb are advised to upgrade to these updated packages, which
contain backported patches to correct these issues.

4. Solution:

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

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/knowledge/articles/11258

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

703238 - CVE-2011-4355 gdb: object file .debug_gdb_scripts section improper input validation
811648 - Cannot find new threads: generic error
836966 - Backport gdb fix to handle identical binaries via additional build-id symlinks

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/gdb-7.2-60.el6.src.rpm

i386:
gdb-7.2-60.el6.i686.rpm
gdb-debuginfo-7.2-60.el6.i686.rpm
gdb-gdbserver-7.2-60.el6.i686.rpm

x86_64:
gdb-7.2-60.el6.x86_64.rpm
gdb-debuginfo-7.2-60.el6.x86_64.rpm
gdb-gdbserver-7.2-60.el6.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/gdb-7.2-60.el6.src.rpm

x86_64:
gdb-7.2-60.el6.x86_64.rpm
gdb-debuginfo-7.2-60.el6.x86_64.rpm
gdb-gdbserver-7.2-60.el6.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/gdb-7.2-60.el6.src.rpm

i386:
gdb-7.2-60.el6.i686.rpm
gdb-debuginfo-7.2-60.el6.i686.rpm
gdb-gdbserver-7.2-60.el6.i686.rpm

ppc64:
gdb-7.2-60.el6.ppc64.rpm
gdb-debuginfo-7.2-60.el6.ppc64.rpm
gdb-gdbserver-7.2-60.el6.ppc64.rpm

s390x:
gdb-7.2-60.el6.s390x.rpm
gdb-debuginfo-7.2-60.el6.s390x.rpm
gdb-gdbserver-7.2-60.el6.s390x.rpm

x86_64:
gdb-7.2-60.el6.x86_64.rpm
gdb-debuginfo-7.2-60.el6.x86_64.rpm
gdb-gdbserver-7.2-60.el6.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/gdb-7.2-60.el6.src.rpm

i386:
gdb-7.2-60.el6.i686.rpm
gdb-debuginfo-7.2-60.el6.i686.rpm
gdb-gdbserver-7.2-60.el6.i686.rpm

x86_64:
gdb-7.2-60.el6.x86_64.rpm
gdb-debuginfo-7.2-60.el6.x86_64.rpm
gdb-gdbserver-7.2-60.el6.x86_64.rpm

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/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2011-4355.html
https://access.redhat.com/security/updates/classification/#moderate
http://sourceware.org/gdb/current/onlinedocs/gdb/Auto_002dloading-safe-path.html#Auto_002dloading-safe-path
http://sourceware.org/gdb/current/onlinedocs/gdb/Auto_002dloading.html#Auto_002dloading

8. Contact:

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

Copyright 2013 Red Hat, Inc.
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