CVE-2011-1756 Denial of service in n/a
Remote attackers can cause denial of service in Citadel mail server via crafted XML with nested entity references, consuming memory and CPU.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2011-1756?
CVE-2011-1756 is a medium-severity denial of service vulnerability in n/a, published on 21 Jun 2011. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
modules/xmpp/serv_xmpp.c in Citadel 7.86 and earlier 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.
Weakness: CWE-399
Which versions are affected by CVE-2011-1756?
It affects 1 product.
Products include Citadel Citadel.
How do I fix CVE-2011-1756?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2011-1756 being exploited?
There is no known exploitation of CVE-2011-1756 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as DSA-2250-1, GHSA-6px8-r2g4-9v5v.