Versions of RT between 4.2.0 and 4.2.2 (inclusive) are vulnerable to adenial-of-service attack via the email gateway; any installation which
accepts mail from untrusted sources is vulnerable, regardless of the
permissions configuration inside RT. This vulnerability is assigned
CVE-2014-1474.
This vulnerability is caused by poor parsing performance in the
Email::Address::List module, which RT depends on. We recommend that
affected users upgrade their version of Email::Address::List to v0.02 or
above, which resolves the issue.
After extracting the contents, the module can be installed by running:
perl Makefile.PL make make install
The first step should be sure to use the same perl that RT runs using.
If you are unsure, the first line of /opt/rt4/sbin/standalone_httpd
should contain the full path to the relevant perl binary. The last step
will likely need to be run with root permissions. After this process,
you should restart your webserver.
If you need help resolving this issue locally, we will provide
discounted pricing for single-incident support; please contact us at
sales@bestpractical.com for more information.