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Debian Security Advisory DSA 2250-1 (citadel)
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
The remote host is missing an update to citadel announced via advisory DSA 2250-1.
Insight
Insight
Wouter Coekaerts discovered that the jabber server component of citadel, a complete and feature-rich groupware server, is vulnerable to the so-called billion laughs attack because it does not prevent entity expansion on received data. This allows an attacker to perform denial of service attacks against the service by sending specially crafted XML data to it. For the oldstable distribution (lenny), this problem has been fixed in version 7.37-8+lenny1. For the stable distribution (squeeze), this problem has been fixed in version 7.83-2squeeze2. For the testing (wheezy) and unstable(sid) distributions, this problem will be fixed soon.
Solution
Solution
We recommend that you upgrade your citadel packages.