Scientific Linux Security Update : rsyslog on SL6.x i386/x86_64

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


Synopsis :

The remote Scientific Linux host is missing one or more security
updates.

Description :

The rsyslog packages provide an enhanced, multi-threaded syslog
daemon.

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.

- 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.

- 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.

- rsyslog could not override the hostname to set an
alternative hostname for locally generated messages.
Now, the local hostname can be overridden.

- 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.

- 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.

- 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.

- 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.

- 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.

- 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.

- The addition of the '/etc/rsyslog.d/' configuration
directory to supply syslog configuration files.

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 :

http://www.nessus.org/u?fd9057f2

Solution :

Update the affected packages.

Risk factor :

Low / CVSS Base Score : 2.1
(CVSS2#AV:L/AC:L/Au:N/C:N/I:N/A:P)

Family: Scientific Linux Local Security Checks

Nessus Plugin ID: 61348 ()

Bugtraq ID:

CVE ID: CVE-2011-4623