Synopsis

Moderate: subversion security update

Type/Severity

Security Advisory: Moderate

Topic

Updated subversion packages that fix three security issues are now
available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having moderate
security impact. Common Vulnerability Scoring System (CVSS) base scores,
which give detailed severity ratings, are available for each vulnerability
from the CVE links in the References section.

Description

Subversion (SVN) is a concurrent version control system which enables one
or more users to collaborate in developing and maintaining a hierarchy of
files and directories while keeping a history of all changes. The
mod_dav_svn module is used with the Apache HTTP Server to allow access to
Subversion repositories via HTTP.

An access restriction bypass flaw was found in the mod_dav_svn module. If
the SVNPathAuthz directive was set to "short_circuit", certain access rules
were not enforced, possibly allowing sensitive repository data to be leaked
to remote users. Note that SVNPathAuthz is set to "On" by default.
(CVE-2010-3315)

A server-side memory leak was found in the Subversion server. If a
malicious, remote user performed "svn blame" or "svn log" operations on
certain repository files, it could cause the Subversion server to consume
a large amount of system memory. (CVE-2010-4644)

A NULL pointer dereference flaw was found in the way the mod_dav_svn module
processed certain requests. If a malicious, remote user issued a certain
type of request to display a collection of Subversion repositories on a
host that has the SVNListParentPath directive enabled, it could cause the
httpd process serving the request to crash. Note that SVNListParentPath is
not enabled by default. (CVE-2010-4539)

All Subversion users should upgrade to these updated packages, which
contain backported patches to correct these issues. After installing the
updated packages, the Subversion server must be restarted for the update
to take effect: restart httpd if you are using mod_dav_svn, or restart
svnserve if it is used.

Solution

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/docs/DOC-11259

Affected Products

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux Desktop 6 i386
• Red Hat Enterprise Linux for IBM z Systems 6 s390x
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux for Scientific Computing 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 6 s390x

Fixes

• BZ - 640317 - CVE-2010-3315 Subversion: Access restriction bypass by checkout of the root of the repository
• BZ - 667407 - CVE-2010-4539 Subversion (mod_dav_svn): DoS (crash) by processing certain requests to display all available repositories to a web browser
• BZ - 667763 - CVE-2010-4644 Subversion: DoS (memory consumption) by processing blame or log -g requests on certain files

CVEs

• CVE-2010-4539
• CVE-2010-4644
• CVE-2010-3315

References