Hi all,
Several XMPP server implementations that support application-layer
compression (XEP-0138) suffer from an uncontrolled resource consumption
vulnerability (CWE-400). This vulnerability can be remotely exploited by
attackers to mount Denial-of-Service attacks by sending
highly-compressed XML elements over XMPP streams.
Affected servers are reported to:
1. Consume the virtual memory; in certain cases, it has been reported
that servers are terminated by the operating system for out of memory
conditions;
2. Monopolize the use of the CPU;
3. In certain cases, not allow administrators to disable stream compression.
It is best to upgrade to corrected server code. An alternative,
temporary workaround is to disable XMPP-level compression.
More details and the list of affected implementations can be found in
the security notice published by the XMPP Standards Foundation:
http://xmpp.org/resources/security-notices/uncontrolled-resource-consumption-with-highly-compressed-xmpp-stanzas/
Thank you.
Best Regards,
Giancarlo Pellegrino
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