Plupii.C proved: Remarkable old Mambo CMS installations in use
Systems behind content management system based Web sites are not always patched. Delays when patching systems are not weeks. In fact, they are more than months.
The XML-RPC for PHP vulnerability from June 2005 is not the only security issue being exploited in this new Linux worm case. One of the other vulnerabilities is GLOBALS['mosConfig_absolute_path'] issue CVE -2005-0512, reported and fixed exactly one year ago. This code injection issue affects Mambo systems 4.5.2 and earlier.
At this time, Mambo defacemect reports from volunteers who helped the Internet Storm Center to make a conclusion that a new Plupii variant is spreading. Sometimes even the word ‘mambo’ in the URL helps confirming Mambo sites being as target of defacement; see new ones at www.zone-h.org/en/defacements/view/id=3354748/ etc.
A fixed Mambo version 126.96.36.199 is available, but administrators simply didn’t patched their systems.