It was found that Subversion's mod_dav_svn Apache HTTPD server module will use excessive amounts of memory when a large number of properties are set or deleted on a node. This can lead to a DoS.
Setting or deleting a large number of properties on a node (file or directory) will result in a large amount of memory use. Due to the memory pooling behavior of Apache httpd and Subversion the completion of the request will not result in the immediate release of memory used. Repeated commits with the same properties will result in each httpd process plateauing out at some amount of memory. This could result in a Denial of Service if the system is exhausted of all available memory.
Red Hat would like to thank the Apache Subversion project for reporting this issue. Upstream acknowledges Alexander Klink as the original reporter of this flaw.
Created attachment 717966 [details]
Created attachment 717967 [details]
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.
Created subversion tracking bugs for this issue
Affects: fedora-all [bug 948813]
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