This module triggers an off-by-two overflow in the rsyslog daemon. This flaw is unlikely to yield code execution but is effective at shutting down a remote log daemon. This bug was introduced in version 4.6.0 and corrected in 4.6.8/5.8.5. Compiler differences may prevent this bug from causing any noticeable result on many systems (RHEL6 is affected).
To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':
msf > use auxiliary/dos/syslog/rsyslog_long_tag
msf auxiliary(rsyslog_long_tag) > show actions
...actions...
msf auxiliary(rsyslog_long_tag) > set ACTION < action-name >
msf auxiliary(rsyslog_long_tag) > show options
...show and set options...
msf auxiliary(rsyslog_long_tag) > run
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– Jim O’Gorman | President, Offensive Security