A security flaw was found in the XMPP Dialback protocol implementation of jabberd2, OpenSource server implementation of the Jabber protocols (Verify Response and Authorization Response were not checked within XMPP protocol server to server session). A rogue XMPP server could use this flaw to spoof one or more domains, when communicating with vulnerable server implementation, possibly leading into XMPP's Server Dialback protections bypass.

References: [1] http://xmpp.org/resources/security-notices/server-dialback/

Upstream patch: [2] https://github.com/Jabberd2/jabberd2/commit/aabcffae560d5fd00cd1d2ffce5d760353cf0a4d

A security flaw was found in the XMPP Dialback protocol implementation of jabberd2, OpenSource server implementation of the Jabber protocols (Verify Response and Authorization Response were not checked within XMPP protocol server to server session). A rogue XMPP server could use this flaw to spoof one or more domains, when communicating with vulnerable server implementation, possibly leading into XMPP's Server Dialback protections bypass.

References: [1] http://xmpp.org/resources/security-notices/server-dialback/

Upstream patch: [2] https://github.com/Jabberd2/jabberd2/commit/aabcffae560d5fd00cd1d2ffce5d760353cf0a4d

jabberd2 before 2.2.14 does not properly detect recursion during entity expansion, which allows remote attackers to cause a denial of service (memory and CPU consumption) via a crafted XML document containing a large number of nested entity references, a similar issue to CVE-2003-1564.