==========================================================================
Ubuntu Security Notice USN-3367-1
July 26, 2017

gdb vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 17.04
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in gdb.

Software Description:
- gdb: GNU Debugger

Details:

Hanno Bock discovered that gdb incorrectly handled certain malformed AOUT
headers in PE executables. If a user or automated system were tricked into
processing a specially crafted binary, a remote attacker could use this
issue to cause gdb to crash, resulting in a denial of service, or possibly
execute arbitrary code. This issue only applied to Ubuntu 14.04 LTS.
(CVE-2014-8501)

It was discovered that gdb incorrectly handled printing bad bytes in Intel
Hex objects. If a user or automated system were tricked into processing a
specially crafted binary, a remote attacker could use this issue to cause
gdb to crash, resulting in a denial of service. This issue only applied to
Ubuntu 14.04 LTS. (CVE-2014-9939)

It was discovered that gdb incorrectly handled certain string operations.
If a user or automated system were tricked into processing a specially
crafted binary, a remote attacker could use this issue to cause gdb to
crash, resulting in a denial of service, or possibly execute arbitrary
code. This issue only applied to Ubuntu 14.04 LTS and Ubuntu 16.04 LTS.
(CVE-2016-2226)

It was discovered that gdb incorrectly handled parsing certain binaries. If
a user or automated system were tricked into processing a specially crafted
binary, a remote attacker could use this issue to cause gdb to crash,
resulting in a denial of service. This issue only applied to Ubuntu 14.04
LTS and Ubuntu 16.04 LTS. (CVE-2016-4487, CVE-2016-4488, CVE-2016-4489,
CVE-2016-4490, CVE-2016-4492, CVE-2016-4493, CVE-2016-6131)

It was discovered that gdb incorrectly handled parsing certain binaries. If
a user or automated system were tricked into processing a specially crafted
binary, a remote attacker could use this issue to cause gdb to crash,
resulting in a denial of service. (CVE-2016-4491)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 17.04:
  gdb                             7.12.50.20170314-0ubuntu1.1

Ubuntu 16.04 LTS:
  gdb                             7.11.1-0ubuntu1~16.5

Ubuntu 14.04 LTS:
  gdb                             7.7.1-0ubuntu5~14.04.3

In general, a standard system update will make all the necessary changes.

References:
  https://www.ubuntu.com/usn/usn-3367-1
  CVE-2014-8501, CVE-2014-9939, CVE-2016-2226, CVE-2016-4487,
  CVE-2016-4488, CVE-2016-4489, CVE-2016-4490, CVE-2016-4491,
  CVE-2016-4492, CVE-2016-4493, CVE-2016-6131

Package Information:
  https://launchpad.net/ubuntu/+source/gdb/7.12.50.20170314-0ubuntu1.1
  https://launchpad.net/ubuntu/+source/gdb/7.11.1-0ubuntu1~16.5
  https://launchpad.net/ubuntu/+source/gdb/7.7.1-0ubuntu5~14.04.3