RHEL 6 : rsyslog (RHSA-2012:0796)

This script is Copyright (C) 2012-2017 Tenable Network Security, Inc.

Synopsis :

The remote Red Hat host is missing one or more security updates.

Description :

Updated rsyslog packages that fix one security issue, multiple bugs,
and add two enhancements 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.

The rsyslog packages provide an enhanced, multi-threaded syslog

A numeric truncation error, leading to a heap-based buffer overflow,
was found in the way the rsyslog imfile module processed text files
containing long lines. An attacker could use this flaw to crash the
rsyslogd daemon or, possibly, execute arbitrary code with the
privileges of rsyslogd, if they are able to cause a long line to be
written to a log file that rsyslogd monitors with imfile. The imfile
module is not enabled by default. (CVE-2011-4623)

Bug fixes :

* Several variables were incorrectly deinitialized with Transport
Layer Security (TLS) transport and keys in PKCS#8 format. The rsyslogd
daemon aborted with a segmentation fault when keys in this format were
provided. Now, the variables are correctly deinitialized. (BZ#727380)

* Previously, the imgssapi plug-in initialization was incomplete. As a
result, the rsyslogd daemon aborted when configured to provide a
GSSAPI listener. Now, the plug-in is correctly initialized.

* The fully qualified domain name (FQDN) for the localhost used in
messages was the first alias found. This did not always produce the
expected result on multihomed hosts. With this update, the algorithm
uses the alias that corresponds to the hostname. (BZ#767527)

* The gtls module leaked a file descriptor every time it was loaded
due to an error in the GnuTLS library. No new files or network
connections could be opened when the limit for the file descriptor
count was reached. This update modifies the gtls module so that it is
not unloaded during the process lifetime. (BZ#803550)

* rsyslog could not override the hostname to set an alternative
hostname for locally generated messages. Now, the local hostname can
be overridden. (BZ#805424)

* The rsyslogd init script did not pass the lock file path to the
'status' action. As a result, the lock file was ignored and a wrong
exit code was returned. This update modifies the init script to pass
the lock file to the 'status' action. Now, the correct exit code is
returned. (BZ#807608)

* Data could be incorrectly deinitialized when rsyslogd was supplied
with malformed spool files. The rsyslogd daemon could be aborted with
a segmentation fault. This update modifies the underlying code to
correctly deinitialize the data. (BZ#813079)

* Previously, deinitialization of non-existent data could, in certain
error cases, occur. As a result, rsyslogd could abort with a
segmentation fault when rsyslog was configured to use a disk assisted
queue without specifying a spool file. With this update, the error
cases are handled gracefully. (BZ#813084)

* The manual page wrongly stated that the '-d' option to turn on
debugging caused the daemon to run in the foreground, which was
misleading as the current behavior is to run in the background. Now,
the manual page reflects the correct behavior. (BZ#820311)

* rsyslog attempted to write debugging messages to standard output
even when run in the background. This resulted in the debugging
information being written to some other output. This was corrected and
the debug messages are no longer written to standard output when run
in the background. (BZ#820996)

* The string buffer to hold the distinguished name (DN) of a
certificate was too small. DNs with more than 128 characters were not
displayed. This update enlarges the buffer to process longer DNs.

Enhancements :

* Support for rate limiting and multi-line message capability. Now,
rsyslogd can limit the number of messages it accepts through a UNIX
socket. (BZ#672182)

* The addition of the '/etc/rsyslog.d/' configuration directory to
supply syslog configuration files. (BZ#740420)

All users of rsyslog are advised to upgrade to these updated packages,
which upgrade rsyslog to version 5.8.10 and correct these issues and
add these enhancements. After installing this update, the rsyslog
daemon will be restarted automatically.

See also :


Solution :

Update the affected packages.

Risk factor :

Low / CVSS Base Score : 2.1
CVSS Temporal Score : 1.8
Public Exploit Available : false

Family: Red Hat Local Security Checks

Nessus Plugin ID: 59585 ()

Bugtraq ID: 51171

CVE ID: CVE-2011-4623

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