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Bug 700454 (CVE-2011-1753) - CVE-2011-1753 ejabberd: DoS via the XML "billion laughs attack"
Summary: CVE-2011-1753 ejabberd: DoS via the XML "billion laughs attack"
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2011-1753
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2011-04-28 12:52 UTC by Jan Lieskovsky
Modified: 2019-09-29 12:44 UTC (History)
3 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2013-04-15 15:00:56 UTC
Embargoed:

Attachments (Terms of Use)

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).
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