Bug 700454 (CVE-2011-1753)

Summary: CVE-2011-1753 ejabberd: DoS via the XML "billion laughs attack"
Product: [Other] Security Response Reporter: Jan Lieskovsky <jlieskov>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: lemenkov, satellitgo, security-response-team
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Clone Of: Environment:
Last Closed: 2013-04-15 15:00:56 UTC Type: ---
Regression: --- Mount Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On:    
Bug Blocks: 734554    

Description Jan Lieskovsky 2011-04-28 12:52:42 UTC
ejabberd, when expat is used, do not properly detect recursion
during entity expansion, which allows context-dependent attackers
to cause a denial of service (memory and CPU consumption) via a
crafted XML document containing a large number of nested entity
references, aka the "billion laughs attack." 

References:
[1] http://en.wikipedia.org/wiki/Billion_laughs
[2] http://www.ibm.com/developerworks/xml/library/x-tipcfsx/

Comment 1 Jan Lieskovsky 2011-04-28 12:54:57 UTC
This issue affects the versions of the ejabberd package, as present
within EPEL-5 and EPEL-6 repositories.

This issue affects the versions of the ejabberd package, as shipped
with Fedora release of 13 and 14.

Comment 4 Jan Lieskovsky 2011-04-28 13:09:51 UTC
The CVE identifier of CVE-2011-1753 has been assigned to this issue.

Comment 5 Tomas Hoger 2011-06-03 14:48:13 UTC
Public now via:
  http://www.ejabberd.im/ejabberd-2.1.7

Comment 6 Jan Lieskovsky 2011-06-03 14:53:10 UTC
The fix for this issue has been already included in the following updates:
1) ejabberd-2.1.8-1.el6 for EPEL-6,
2) ejabberd-2.1.8-1.el5 for EPEL-5,
3) ejabberd-2.1.8-1.fc15 for Fedora-15 and finally
4) ejabberd-2.1.8-1.fc14 for Fedora-14.

Comment 7 Peter Lemenkov 2011-06-03 15:03:03 UTC
(In reply to comment #6)
> The fix for this issue has been already included in the following updates:
> 1) ejabberd-2.1.8-1.el6 for EPEL-6,
> 2) ejabberd-2.1.8-1.el5 for EPEL-5,
> 3) ejabberd-2.1.8-1.fc15 for Fedora-15 and finally
> 4) ejabberd-2.1.8-1.fc14 for Fedora-14.

Note - I don't plan to update F-13 (it will be obsoleted very soon so why bother).