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Vulnerability of RSYSLOG: integer overflow of PRI

Synthesis of the vulnerability 

An attacker can generate an integer overflow via PRI in RSYSLOG, in order to trigger a denial of service, and possibly to execute code.
Vulnerable software: Debian, Fedora, AIX, openSUSE, Solaris, RHEL, RSYSLOG, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this announce: 2/4.
Creation date: 30/09/2014.
Références of this computer vulnerability: bulletinoct2015, CVE-2014-3634, DSA-3040-1, FEDORA-2014-12503, FEDORA-2014-12878, FEDORA-2014-12910, MDVSA-2014:196, MDVSA-2015:130, openSUSE-SU-2014:1297-1, openSUSE-SU-2014:1298-1, RHSA-2014:1397-01, RHSA-2014:1654-01, RHSA-2014:1671-01, SUSE-SU-2014:1294-1, USN-2381-1, VIGILANCE-VUL-15427.

Description of the vulnerability 

The RSYSLOG product analyzes messages in the SYSLOG format:
  <PRI> HEADER MSG
The PRI field indicates the priority, which is composed of the message Facility and Severity.

However, if PRI is larger than 191, an array related to the Facility overflows in RSYSLOG.

When RSYSLOG is configured to accept SYSLOG messages from the network, this vulnerability can be remotely exploited.

An attacker can therefore generate an integer overflow via PRI in RSYSLOG, in order to trigger a denial of service, and possibly to execute code.
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This computer threat bulletin impacts software or systems such as Debian, Fedora, AIX, openSUSE, Solaris, RHEL, RSYSLOG, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this security threat is medium.

The trust level is of type confirmed by the editor, with an origin of intranet client.

An attacker with a expert ability can exploit this computer vulnerability alert.

Solutions for this threat 

RSYSLOG: version 8.4.1.
The version 8.4.1 is fixed:
  http://www.rsyslog.com/

RSYSLOG: version 7.6.6.
The version 7.6.6 is fixed:
  http://www.rsyslog.com/

RSYSLOG: patch for PRI.
A patch is available in information sources.

AIX: patch for RSYSLOG.
A patch is available:
  ftp://aix.software.ibm.com/aix/efixes/security/rsyslog_fix.tar

Debian: new rsyslog packages.
New packages are available:
  Debian 7: rsyslog 5.8.11-3+deb7u1

Fedora 20: new rsyslog packages.
New packages are available:
  Fedora 20: rsyslog 7.4.8-2.fc20

Fedora: new sysklogd packages.
New packages are available:
  Fedora 19: sysklogd 1.5-18.fc19
  Fedora 20: sysklogd 1.5-18.fc20

Mandriva BS2: new rsyslog packages.
New packages are available:
  Mandriva BS2: rsyslog 5.10.1-3.1.mbs2

Mandriva: new rsyslog packages.
New packages are available:
  Mandriva BS1: rsyslog 5.8.10-6.2.mbs1

openSUSE: new rsyslog packages.
New packages are available:
  openSUSE 12.3: rsyslog 7.2.7-2.13.1
  openSUSE 13.1: rsyslog 7.4.7-2.20.1

RHEL 6.6: new rsyslog7 packages.
New packages are available:
  RHEL 6: rsyslog7 7.4.10-3.el6_6

RHEL 7.0: new rsyslog packages.
New packages are available:
  RHEL 7: rsyslog 7.4.7-7.el7_0

RHEL: new rsyslog5 packages.
New packages are available:
  RHEL 6: rsyslog 5.8.10-9.el6_6
  RHEL 5: rsyslog5 5.8.12-5.el5_11

Solaris: patch for Third Party (10/2015).
A patch is available:
  https://support.oracle.com/rs?type=doc&id=1448883.1

SUSE LE 11: new rsyslog packages.
New packages are available:
  SUSE LE 11: rsyslog 5.10.1-0.11.1

Ubuntu: new rsyslog packages.
New packages are available:
  Ubuntu 14.04 LTS: rsyslog 7.4.4-1ubuntu2.3
  Ubuntu 12.04 LTS: rsyslog 5.8.6-1ubuntu8.9
  Ubuntu 10.04 LTS: rsyslog 4.2.0-2ubuntu8.3
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