Bug 929093 (CVE-2013-1849)

Summary: CVE-2013-1849 Subversion (mod_dav_svn): DoS (crash) via PROPFIND request made against activity URLs
Product: [Other] Security Response Reporter: Huzaifa S. Sidhpurwala <huzaifas>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: jkaluza, jlieskov, jorton, vanmeeuwen+fedora
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Subversion 1.6.21, Subversion 1.7.9 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2013-11-18 13:13:54 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 947369, 947370, 947372, 947374, 948813    
Bug Blocks: 929099    

Description Huzaifa S. Sidhpurwala 2013-03-29 08:59:39 UTC 
It was found that Subversion's mod_dav_svn Apache HTTPD server module will crash when a PROPFIND request is made against activity URLs. This can lead to a DoS. 

There is a flaw in mod_dav_svn that improperly tries to process this request instead of rejecting it and results in an attempt to access invalid memory (NULL).  Which results in the httpd process segfaulting and dying.  How bad the impact of that is varies based upon the configuration of the httpd server. httpd servers using a prefork MPM will simply start a new process to replace the process that died.  Servers using threaded MPMs may be processing other requests in the same process as the process that the attack causes to die.  In either case there is an increased processing impact of restarting a process and the cost of per process caches being lost.
Comment 1 Huzaifa S. Sidhpurwala 2013-03-29 09:01:21 UTC 
External Reference:

http://seclists.org/fulldisclosure/2013/Mar/56
Comment 4 Huzaifa S. Sidhpurwala 2013-04-04 09:09:02 UTC 
This issue affects the version of subversion as shipped with Red Hat Enterprise Linux 5 and 6.

This issue affects the version of subversion as shipped with Fedora 17 and Fedora 18.
Comment 5 Jan Lieskovsky 2013-04-05 12:49:19 UTC 
External References:

http://subversion.apache.org/security/CVE-2013-1849-advisory.txt
Comment 6 Jan Lieskovsky 2013-04-05 12:50:21 UTC 
Announcements:
http://mail-archives.apache.org/mod_mbox/subversion-announce/201304.mbox/%3CCADkdwvRoyVrZV12tgC0FMGrc6%2BMisd3qTcZ%2BDdpFGgTahkgAkQ%40mail.gmail.com%3E (v1.7.9)

http://mail-archives.apache.org/mod_mbox/subversion-announce/201304.mbox/%3CCADkdwvSTMLbn4q_KM3Ph2UOeSiPGhEK4%3DSvwEjaHW_GUGkYWPQ%40mail.gmail.com%3E (v1.6.21)
Comment 7 Jan Lieskovsky 2013-04-05 12:59:54 UTC 
Created subversion tracking bugs for this issue

Affects: fedora-all [bug 948813]
Comment 9 errata-xmlrpc 2013-04-11 17:49:28 UTC 
This issue has been addressed in following products:

  Red Hat Enterprise Linux 6
  Red Hat Enterprise Linux 5

Via RHSA-2013:0737 https://rhn.redhat.com/errata/RHSA-2013-0737.html