The mod_dav_svn Apache HTTPD server module in Subversion 1.6.x before 1.6.21 and 1.7.0 through 1.7.8 allows remote authenticated users to cause a denial of service (memory consumption) by (1) setting or (2) deleting a large number of properties for a file or directory.

This update fixes several DoS vulnerabilities in subversion's mod_dav_svn Apache HTTPD server module. (CVE-2013-1849, CVE-2013-1846, CVE-2013-1845)

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Several vulnerabilities were discovered in Subversion, a version control system. The Common Vulnerabilities and Exposures project identifies the following problems :

CVE-2015-0248

Subversion mod_dav_svn and svnserve were vulnerable to a remotely triggerable assertion DoS vulnerability for certain requests with dynamically evaluated revision numbers.

CVE-2015-0251

Subversion HTTP servers allow spoofing svn:author property values for new revisions via specially crafted v1 HTTP protocol request sequences.

CVE-2013-1845

Subversion mod_dav_svn was vulnerable to a denial of service attack through a remotely triggered memory exhaustion.

CVE-2013-1846 / CVE-2013-1847 / CVE-2013-1849 / CVE-2014-0032

Subversion mod_dav_svn was vulnerable to multiple remotely triggered crashes.

This update has been prepared by James McCoy.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Subversion received minor version updates to fix remote triggerable vulnerabilities in mod_dav_svn which may result in denial of service.

On openSUSE 12.1 :

  - update to 1.6.21 [bnc#813913], addressing remotely     triggerable 

  + CVE-2013-1845: mod_dav_svn excessive memory usage from     property changes

  + CVE-2013-1846: mod_dav_svn crashes on LOCK requests     against activity URLs

  + CVE-2013-1847: mod_dav_svn crashes on LOCK requests     against non-existent URLs

  + CVE-2013-1849: mod_dav_svn crashes on PROPFIND requests     against activity URLs

  - further changes :

  + mod_dav_svn will omit some property values for activity     urls

  + improve memory usage when committing properties in     mod_dav_svn

  + fix mod_dav_svn runs pre-revprop-change twice

  + fixed: post-revprop-change errors cancel commit

  + improved logic in mod_dav_svn's implementation of lock.

  + fix a compatibility issue with g++ 4.7

On openSUSE 12.2 and 12.3 :

  - update to 1.7.9 [bnc#813913], addressing remotely     triggerable vulnerabilities in mod_dav_svn which may     result in denial of service :

  + CVE-2013-1845: mod_dav_svn excessive memory usage from     property changes

  + CVE-2013-1846: mod_dav_svn crashes on LOCK requests     against activity URLs

  + CVE-2013-1847: mod_dav_svn crashes on LOCK requests     against non-existent URLs

  + CVE-2013-1849: mod_dav_svn crashes on PROPFIND requests     against activity URLs

  + CVE-2013-1884: mod_dav_svn crashes on out of range limit     in log REPORT

  - further changes :

  + Client-side bugfixes :

  - improved error messages about svn:date and svn:author     props.

  - fix local_relpath assertion

  - fix memory leak in `svn log` over svn://

  - fix incorrect authz failure when using neon http library

  - fix segfault when using kwallet

  + Server-side bugfixes :

  - svnserve will log the replayed rev not the low-water     rev.

  - mod_dav_svn will omit some property values for activity     urls

  - fix an assertion in mod_dav_svn when acting as a proxy     on /

  - improve memory usage when committing properties in     mod_dav_svn

  - fix svnrdump to load dump files with non-LF line endings

  - fix assertion when rep-cache is inaccessible

  - improved logic in mod_dav_svn's implementation of lock.

  - avoid executing unnecessary code in log with limit

  - Developer-visible changes :

  + General :

  - fix an assertion in dav_svn_get_repos_path() on Windows

  - fix get-deps.sh to correctly download zlib

  - doxygen docs will now ignore prefixes when producing the     index

  - fix get-deps.sh on freebsd

  + Bindings :

  - javahl status api now respects the ignoreExternals     boolean

  - refresh subversion-no-build-date.patch for upstream     source changes

The remote host is affected by the vulnerability described in GLSA-201309-11 (Subversion: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in Subversion. Please       review the CVE identifiers referenced below for details.
  Impact :

    A remote attacker could cause a Denial of Service condition or obtain       sensitive information. A local attacker could escalate his privileges to       the user running svnserve.
  Workaround :

    There is no known workaround at this time.

A NULL pointer dereference flaw was found in the way the mod_dav_svn module handled PROPFIND requests on activity URLs. A remote attacker could use this flaw to cause the httpd process serving the request to crash. (CVE-2013-1849)

A flaw was found in the way the mod_dav_svn module handled large numbers of properties (such as those set with the 'svn propset' command). A malicious, remote user could use this flaw to cause the httpd process serving the request to consume an excessive amount of system memory. (CVE-2013-1845)

Two NULL pointer dereference flaws were found in the way the mod_dav_svn module handled LOCK requests on certain types of URLs. A malicious, remote user could use these flaws to cause the httpd process serving the request to crash. (CVE-2013-1846 , CVE-2013-1847)

Note: The CVE-2013-1849 , CVE-2013-1846 , and CVE-2013-1847 issues only caused a temporary denial of service, as the Apache HTTP Server started a new process to replace the crashed child process. When using prefork MPM, the crash only affected the attacker. When using worker (threaded) MPM, the connections of other users may have been interrupted.

The remote host is running an Apache Subversion Server server. Versions before 1.6.21, or 1.7.x before 1.7.9  are vulnerable to the following vulnerabilities in the mod_dav_svn Apache HTTPD server module :

  - A flaw exists in the 'mod_dav_svn' that is triggered when handling node properties. (CVE-2013-1845)

  - A NULL pointer dereference exists in the 'mod_dav_svn' module, triggered during the handling of a crafted Log REPORT request, URL lock request, LOCK request against non-existent URL, and URL PROPFIND request. (CVE-2013-1846, CVE-2013-1847, CVE-2013-1849)

  - A NULL pointer dereference exists in the 'mod_dav_svn' module, triggered during the handling of a crafted Log REPORT request.  This flaw reportedly affects Apache Subversion 1.7.x only.  (CVE-2013-1884).

Versions of Apache Subversion prior to 1.6.21, or 1.7.x prior to 1.7.9  are vulnerable to the following vulnerabilities in the 'mod_dav_svn' Apache HTTPD server module :

  - A flaw exists in the 'mod_dav_svn' that is triggered when handling node properties. (CVE-2013-1845)
 - A NULL pointer dereference exists in the 'mod_dav_svn' module, triggered during the handling of a crafted Log REPORT request, URL lock request, LOCK request against non-existent URL, and URL PROPFIND request. (CVE-2013-1846, CVE-2013-1847, CVE-2013-1849)
 - A NULL pointer dereference exists in the 'mod_dav_svn' module, triggered during the handling of a crafted Log REPORT request.  This flaw reportedly affects Apache Subversion 1.7.x only.  (CVE-2013-1884). 

The remote Oracle Linux 5 / 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2013-0737 advisory.

    - add security fixes for CVE-2013-1846, CVE-2013-1847, CVE-2013-1849 (#947372)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Alexander Klink discovered that the Subversion mod_dav_svn module for Apache did not properly handle a large number of properties. A remote authenticated attacker could use this flaw to cause memory consumption, leading to a denial of service. (CVE-2013-1845)

Ben Reser discovered that the Subversion mod_dav_svn module for Apache did not properly handle certain LOCKs. A remote authenticated attacker could use this flaw to cause Subversion to crash, leading to a denial of service. (CVE-2013-1846)

Philip Martin and Ben Reser discovered that the Subversion mod_dav_svn module for Apache did not properly handle certain LOCKs. A remote attacker could use this flaw to cause Subversion to crash, leading to a denial of service. (CVE-2013-1847)

It was discovered that the Subversion mod_dav_svn module for Apache did not properly handle certain PROPFIND requests. A remote attacker could use this flaw to cause Subversion to crash, leading to a denial of service. (CVE-2013-1849)

Greg McMullin, Stefan Fuhrmann, Philip Martin, and Ben Reser discovered that the Subversion mod_dav_svn module for Apache did not properly handle certain log REPORT requests. A remote attacker could use this flaw to cause Subversion to crash, leading to a denial of service. This issue only affected Ubuntu 12.10 and Ubuntu 13.04.
(CVE-2013-1884)

Stefan Sperling discovered that Subversion incorrectly handled newline characters in filenames. A remote authenticated attacker could use this flaw to corrupt FSFS repositories. (CVE-2013-1968)

Boris Lytochkin discovered that Subversion incorrectly handled TCP connections that were closed early. A remote attacker could use this flaw to cause Subversion to crash, leading to a denial of service.
(CVE-2013-2112).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update fixes several DoS vulnerabilities in subversion's mod_dav_svn Apache HTTPD server module. (CVE-2013-1849 / CVE-2013-1846 / CVE-2013-1845)

The version of Apache Subversion Server installed on the remote host is prior to 1.6.21 or 1.7.x prior to 1.7.9. It is, therefore, affected by multiple denial of service (DoS) vulnerabilities in the 'mod_dav_svn' Apache HTTPD server module :

  - A flaw exists in 'mod_dav_svn' that is triggered when     handling node properties. (CVE-2013-1845)

  - A NULL pointer dereference exists in the 'mod_dav_svn'     module, triggered during the handling of a crafted Log     REPORT request, URL lock request, LOCK request against     non-existent URL, or URL PROPFIND request.
    (CVE-2013-1846, CVE-2013-1847, CVE-2013-1849)

  - A NULL pointer dereference exists in the 'mod_dav_svn'     module, triggered during the handling of a crafted Log     REPORT request. This flaw reportedly affects Apache     Subversion 1.7.x only.  (CVE-2013-1884)

Multiple vulnerabilities has been found and corrected in subversion :

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. There are no known instances of this problem being observed in the wild (CVE-2013-1845).

Subversion's mod_dav_svn Apache HTTPD server module will crash when a LOCK request is made against activity URLs. This can lead to a DoS.
There are no known instances of this problem being observed in the wild (CVE-2013-1846).

Subversion's mod_dav_svn Apache HTTPD server module will crash in some circumstances when a LOCK request is made against a non-existent URL.
This can lead to a DoS. There are no known instances of this problem being observed in the wild (CVE-2013-1847).

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 are no known instances of this problem being observed in the wild, but the details of how to exploit it have been disclosed on the full disclosure mailing list (CVE-2013-1849).

Subversion's mod_dav_svn Apache HTTPD server module will crash when a log REPORT request receives a limit that is out of the allowed range.
This can lead to a DoS. There are no known instances of this problem being used as a DoS in the wild (CVE-2013-1884).

The updated packages have been upgraded to the 1.7.9 version which is not affected by these issues.

A NULL pointer dereference flaw was found in the way the mod_dav_svn module handled PROPFIND requests on activity URLs. A remote attacker could use this flaw to cause the httpd process serving the request to crash. (CVE-2013-1849)

A flaw was found in the way the mod_dav_svn module handled large numbers of properties (such as those set with the 'svn propset' command). A malicious, remote user could use this flaw to cause the httpd process serving the request to consume an excessive amount of system memory. (CVE-2013-1845)

Two NULL pointer dereference flaws were found in the way the mod_dav_svn module handled LOCK requests on certain types of URLs. A malicious, remote user could use these flaws to cause the httpd process serving the request to crash. (CVE-2013-1846, CVE-2013-1847)

Note: The CVE-2013-1849, CVE-2013-1846, and CVE-2013-1847 issues only caused a temporary denial of service, as the Apache HTTP Server started a new process to replace the crashed child process. When using prefork MPM, the crash only affected the attacker. When using worker (threaded) MPM, the connections of other users may have been interrupted.

After installing the updated packages, you must restart the httpd daemon, if you are using mod_dav_svn, for the update to take effect.

New subversion packages are available for Slackware 13.0, 13.1, 13.37, 14.0, and -current to fix security issues.

Updated subversion packages that fix multiple security issues are now available for Red Hat Enterprise Linux 5 and 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.

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.

A NULL pointer dereference flaw was found in the way the mod_dav_svn module handled PROPFIND requests on activity URLs. A remote attacker could use this flaw to cause the httpd process serving the request to crash. (CVE-2013-1849)

A flaw was found in the way the mod_dav_svn module handled large numbers of properties (such as those set with the 'svn propset' command). A malicious, remote user could use this flaw to cause the httpd process serving the request to consume an excessive amount of system memory. (CVE-2013-1845)

Two NULL pointer dereference flaws were found in the way the mod_dav_svn module handled LOCK requests on certain types of URLs. A malicious, remote user could use these flaws to cause the httpd process serving the request to crash. (CVE-2013-1846, CVE-2013-1847)

Note: The CVE-2013-1849, CVE-2013-1846, and CVE-2013-1847 issues only caused a temporary denial of service, as the Apache HTTP Server started a new process to replace the crashed child process. When using prefork MPM, the crash only affected the attacker. When using worker (threaded) MPM, the connections of other users may have been interrupted.

Red Hat would like to thank the Apache Subversion project for reporting these issues. Upstream acknowledges Alexander Klink as the original reporter of CVE-2013-1845; Ben Reser as the original reporter of CVE-2013-1846; and Philip Martin and Ben Reser as the original reporters of CVE-2013-1847.

All subversion users should upgrade to these updated packages, which contain backported patches to correct these issues. After installing the updated packages, you must restart the httpd daemon, if you are using mod_dav_svn, for the update to take effect.

Subversion team reports :

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.

Subversion's mod_dav_svn Apache HTTPD server module will crash when a LOCK request is made against activity URLs.

Subversion's mod_dav_svn Apache HTTPD server module will crash in some circumstances when a LOCK request is made against a non-existent URL.

Subversion's mod_dav_svn Apache HTTPD server module will crash when a PROPFIND request is made against activity URLs.

Subversion's mod_dav_svn Apache HTTPD server module will crash when a log REPORT request receives a limit that is out of the allowed range.

ID	Name	Product	Family	Severity
83584	SUSE SLED10 Security Update : subversion (SUSE-SU-2013:0837-1)	Nessus	SuSE Local Security Checks	medium
83060	Debian DLA-207-1 : subversion security update	Nessus	Debian Local Security Checks	medium
74976	openSUSE Security Update : subversion (openSUSE-SU-2013:0687-1)	Nessus	SuSE Local Security Checks	medium
70084	GLSA-201309-11 : Subversion: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
69739	Amazon Linux AMI : subversion (ALAS-2013-180)	Nessus	Amazon Linux Local Security Checks	medium
801403	Apache Subversion < 1.6.21 / 1.7.x < 1.7.9 Multiple DoS	Log Correlation Engine	Web Servers	medium
6943	Apache Subversion < 1.6.21 / 1.7.x < 1.7.9 Multiple DoS	Nessus Network Monitor	Web Servers	medium
68805	Oracle Linux 5 / 6 : subversion (ELSA-2013-0737)	Nessus	Oracle Linux Local Security Checks	high
67016	Ubuntu 12.04 LTS / 12.10 / 13.04 : subversion vulnerabilities (USN-1893-1)	Nessus	Ubuntu Local Security Checks	high
66617	SuSE 10 Security Update : subversion (ZYPP Patch Number 8552)	Nessus	SuSE Local Security Checks	medium
66474	Apache Subversion < 1.6.21 / 1.7.x < 1.7.9 Multiple DoS	Nessus	Windows	medium
66252	Mandriva Linux Security Advisory : subversion (MDVSA-2013:153)	Nessus	Mandriva Local Security Checks	medium
65957	Scientific Linux Security Update : subversion on SL5.x, SL6.x i386/x86_64 (20130411)	Nessus	Scientific Linux Local Security Checks	medium
65945	Slackware 13.0 / 13.1 / 13.37 / 14.0 / current : subversion (SSA:2013-095-01)	Nessus	Slackware Local Security Checks	medium
65938	RHEL 5 / 6 : subversion (RHSA-2013:0737)	Nessus	Red Hat Local Security Checks	medium
65932	CentOS 5 / 6 : subversion (CESA-2013:0737)	Nessus	CentOS Local Security Checks	medium
65849	FreeBSD : Subversion -- multiple vulnerabilities (b6beb137-9dc0-11e2-882f-20cf30e32f6d)	Nessus	FreeBSD Local Security Checks	medium

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