The mod_dav_svn module for the Apache HTTP Server, as distributed in Apache Subversion 1.5.x and 1.6.x before 1.6.17, when the SVNPathAuthz short_circuit option is enabled, allows remote attackers to cause a denial of service (infinite loop and memory consumption) in opportunistic circumstances by requesting data.

Subversion was updated to version 1.6.17 to fix several security issues :

  - CVE-2011-1752: The mod_dav_svn Apache HTTPD server     module can be crashed though when asked to deliver     baselined WebDAV resources.

  - CVE-2011-1783: The mod_dav_svn Apache HTTPD server     module can trigger a loop which consumes all available     memory on the system.

  - CVE-2011-1921: The mod_dav_svn Apache HTTPD server     module may leak to remote users the file contents of     files configured to be unreadable by those users.

- CVE-2011-1752: The mod_dav_svn Apache HTTPD server     module can be crashed though when asked to deliver     baselined WebDAV resources.

  - CVE-2011-1783: The mod_dav_svn Apache HTTPD server     module can trigger a loop which consumes all available     memory on the system.

  - CVE-2011-1921: The mod_dav_svn Apache HTTPD server     module may leak to remote users the file contents of     files configured to be unreadable by those users.

  - CVE-2011-0715: Remote attackers could crash an svn     server by causing a NULL deref

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.

The remote Oracle Linux 5 / 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2011-0862 advisory.

    [1.6.11-2.4]
    - add security fixes for CVE-2011-1752, CVE-2011-1783, CVE-2011-1921 (#709220)

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.

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 infinite loop flaw was found in the way the mod_dav_svn module processed certain data sets. If the SVNPathAuthz directive was set to 'short_circuit', and path-based access control for files and directories was enabled, 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-2011-1783)

A NULL pointer dereference flaw was found in the way the mod_dav_svn module processed requests submitted against the URL of a baselined resource. A malicious, remote user could use this flaw to cause the httpd process serving the request to crash. (CVE-2011-1752)

An information disclosure flaw was found in the way the mod_dav_svn module processed certain URLs when path-based access control for files and directories was enabled. A malicious, remote user could possibly use this flaw to access certain files in a repository that would otherwise not be accessible to them. Note: This vulnerability cannot be triggered if the SVNPathAuthz directive is set to 'short_circuit'.
(CVE-2011-1921)

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.

The remote host is running a version of Mac OS X 10.7 that is older than version 10.7.3.  The newer version contains numerous security-related fixes for the following components :

  - Address Book
  - Apache
  - ATS
  - CFNetwork
 - CoreMedia
 - CoreText
 - CoreUI
 - curl
 - Data Security
 - dovecot
 - filecmds
 - ImageIO
 - Internet Sharing
 - Libinfo
 - libresolv
 - libsecurity
 - OpenGL
 - PHP
 - QuickTime
 - Subversion
 - Time Machine
 - WebDAV Sharing
 - Webmail
 - X11

The remote host is running a version of Mac OS X 10.6 that does not have Security Update 2012-001 applied. This update contains multiple security-related fixes for the following components :

  - Apache
  - ATS
  - ColorSync
  - CoreAudio
  - CoreMedia
  - CoreText
  - curl
  - Data Security
  - dovecot
  - filecmds
  - libresolv
  - libsecurity
  - OpenGL
  - PHP
  - QuickTime
  - SquirrelMail
  - Subversion
  - Tomcat
  - X11

The remote host is running a version of Mac OS X 10.7.x that is prior to 10.7.3. The newer version contains multiple security-related fixes for the following components :

  - Address Book
  - Apache
  - ATS
  - CFNetwork
  - CoreMedia
  - CoreText
  - CoreUI
  - curl
  - Data Security
  - dovecot
  - filecmds
  - ImageIO
  - Internet Sharing
  - Libinfo
  - libresolv
  - libsecurity
  - OpenGL
  - PHP
  - QuickTime
  - Subversion
  - Time Machine
  - WebDAV Sharing
  - Webmail
  - X11

Subversion was updated to fix several security issues :

  - The mod_dav_svn Apache HTTPD server module can be     crashed though when asked to deliver baselined WebDAV     resources. (CVE-2011-1752)

  - The mod_dav_svn Apache HTTPD server module can trigger a     loop which consumes all available memory on the system.
    (CVE-2011-1783)

  - Remote attackers could crash an svn server by causing a     NULL deref. (CVE-2011-0715)

This update includes the latest release of Subversion, fixing three security issues :

An infinite loop flaw was found in the way the mod_dav_svn module processed certain data sets. If the SVNPathAuthz directive was set to 'short_circuit', and path-based access control for files and directories was enabled, 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-2011-1783)

A NULL pointer dereference flaw was found in the way the mod_dav_svn module processed requests submitted against the URL of a baselined resource. A malicious, remote user could use this flaw to cause the httpd process serving the request to crash. (CVE-2011-1752)

An information disclosure flaw was found in the way the mod_dav_svn module processed certain URLs when path-based access control for files and directories was enabled. A malicious, remote user could possibly use this flaw to access certain files in a repository that would otherwise not be accessible to them. Note: This vulnerability cannot be triggered if the SVNPathAuthz directive is set to 'short_circuit'.
(CVE-2011-1921)

The Fedora Project would like to thank the Apache Subversion project for reporting these issues. Upstream acknowledges Joe Schaefer of the Apache Software Foundation as the original reporter of CVE-2011-1752;
Ivan Zhakov of VisualSVN as the original reporter of CVE-2011-1783;
and Kamesh Jayachandran of CollabNet, Inc. as the original reporter of CVE-2011-1921.

The following bugs are also fixed in this release :

  - make 'blame -g' more efficient on with large mergeinfo

    - preserve log message with a non-zero editor exit

    - fix FSFS cache performance on 64-bit platforms

    - make svn cleanup tolerate obstructed directories

    - fix deadlock in multithreaded servers serving FSFS       repositories

    - detect very occasional corruption and abort commit

    - fixed: file externals cause non-inheritable mergeinfo

    - fixed: file externals cause mixed-revision working       copies

    - fixed: write-through proxy could direcly commit to       slave

    - detect a particular corruption condition in FSFS

    - improve error message when clients refer to unkown       revisions

    - bugfixes and optimizations to the DAV mirroring code

    - fixed: locked and deleted file causes tree conflict

    - fixed: update touches locked file with svn:keywords       property

    - fix svnsync handling of directory copyfrom

    - fix 'log -g' excessive duplicate output

    - fix svnsync copyfrom handling bug with BDB

    - server-side validation of svn:mergeinfo syntax during       commit

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

Joe Schaefer discovered that the Subversion mod_dav_svn module for Apache did not properly handle certain baselined WebDAV resource requests. A remote attacker could use this flaw to cause the service to crash, leading to a denial of service. (CVE-2011-1752)

Ivan Zhakov discovered that the Subversion mod_dav_svn module for Apache did not properly handle certain requests. A remote attacker could use this flaw to cause the service to consume all available resources, leading to a denial of service. (CVE-2011-1783)

Kamesh Jayachandran discovered that the Subversion mod_dav_svn module for Apache did not properly handle access control in certain situations. A remote user could use this flaw to gain access to files that would otherwise be unreadable. (CVE-2011-1921).

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.

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

  - CVE-2011-1752     The mod_dav_svn Apache HTTPD server module can be     crashed though when asked to deliver baselined WebDAV     resources.

  - CVE-2011-1783     The mod_dav_svn Apache HTTPD server module can trigger a     loop which consumes all available memory on the system.

  - CVE-2011-1921     The mod_dav_svn Apache HTTPD server module may leak to     remote users the file contents of files configured to be     unreadable by those users.

The remote Redhat Enterprise Linux 5 / 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2011:0862 advisory.

  - subversion (mod_dav_svn): DoS (crash) via request to deliver baselined WebDAV resources (CVE-2011-1752)

  - subversion (mod_dav_svn): DoS (excessive memory use) when configured to provide path-based access control     (CVE-2011-1783)

  - subversion (mod_dav_svn): File contents disclosure of files configured to be unreadable by those users     (CVE-2011-1921)

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

Updated subversion packages that fix three 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.

An infinite loop flaw was found in the way the mod_dav_svn module processed certain data sets. If the SVNPathAuthz directive was set to 'short_circuit', and path-based access control for files and directories was enabled, 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-2011-1783)

A NULL pointer dereference flaw was found in the way the mod_dav_svn module processed requests submitted against the URL of a baselined resource. A malicious, remote user could use this flaw to cause the httpd process serving the request to crash. (CVE-2011-1752)

An information disclosure flaw was found in the way the mod_dav_svn module processed certain URLs when path-based access control for files and directories was enabled. A malicious, remote user could possibly use this flaw to access certain files in a repository that would otherwise not be accessible to them. Note: This vulnerability cannot be triggered if the SVNPathAuthz directive is set to 'short_circuit'.
(CVE-2011-1921)

Red Hat would like to thank the Apache Subversion project for reporting these issues. Upstream acknowledges Joe Schaefer of the Apache Software Foundation as the original reporter of CVE-2011-1752;
Ivan Zhakov of VisualSVN as the original reporter of CVE-2011-1783;
and Kamesh Jayachandran of CollabNet, Inc. as the original reporter of CVE-2011-1921.

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.

Multiple vulnerabilities were discovered and corrected in subversion :

The mod_dav_svn Apache HTTPD server module will dereference a NULL pointer if asked to deliver baselined WebDAV resources which can lead to a DoS (Denial Of Service) (CVE-2011-1752).

The mod_dav_svn Apache HTTPD server module may in certain cenarios enter a logic loop which does not exit and which allocates emory in each iteration, ultimately exhausting all the available emory on the server which can lead to a DoS (Denial Of Service) (CVE-2011-1783).

The mod_dav_svn Apache HTTPD server module may leak to remote users the file contents of files configured to be unreadable by those users (CVE-2011-1921).

Packages for 2009.0 are provided as of the Extended Maintenance Program. Please visit this link to learn more:
http://store.mandriva.com/product_info.php?cPath=149 products_id=490

The updated packages have been upgraded to the 1.6.17 version which is not vulnerable to these issues.

Subversion team reports :

Subversion's mod_dav_svn Apache HTTPD server module will dereference a NULL pointer if asked to deliver baselined WebDAV resources.

This can lead to a DoS. An exploit has been tested, and tools or users have been observed triggering this problem in the wild.

Subversion's mod_dav_svn Apache HTTPD server module may in certain scenarios enter a logic loop which does not exit and which allocates memory in each iteration, ultimately exhausting all the available memory on the server.

This can lead to a DoS. There are no known instances of this problem being observed in the wild, but an exploit has been tested.

Subversion's mod_dav_svn Apache HTTPD server module may leak to remote users the file contents of files configured to be unreadable by those users.

There are no known instances of this problem being observed in the wild, but an exploit has been tested.

ID	Name	Product	Family	Severity
75923	openSUSE Security Update : libsvn_auth_gnome_keyring-1-0 (openSUSE-SU-2011:0695-1)	Nessus	SuSE Local Security Checks	medium
75617	openSUSE Security Update : libsvn_auth_gnome_keyring-1-0 (openSUSE-SU-2011:0693-1)	Nessus	SuSE Local Security Checks	medium
70084	GLSA-201309-11 : Subversion: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
68291	Oracle Linux 5 / 6 : subversion (ELSA-2011-0862)	Nessus	Oracle Linux Local Security Checks	high
61067	Scientific Linux Security Update : subversion on SL5.x, SL6.x i386/x86_64	Nessus	Scientific Linux Local Security Checks	medium
6303	Mac OS X 10.7 < 10.7.3 Multiple Vulnerabilities	Nessus Network Monitor	Generic	critical
57798	Mac OS X Multiple Vulnerabilities (Security Update 2012-001) (BEAST)	Nessus	MacOS X Local Security Checks	critical
57797	Mac OS X 10.7.x < 10.7.3 Multiple Vulnerabilities (BEAST)	Nessus	MacOS X Local Security Checks	critical
57173	SuSE 10 Security Update : subversion (ZYPP Patch Number 7560)	Nessus	SuSE Local Security Checks	medium
55496	Fedora 14 : subversion-1.6.17-1.fc14 (2011-8341)	Nessus	Fedora Local Security Checks	medium
55412	Fedora 15 : subversion-1.6.17-1.fc15 (2011-8352)	Nessus	Fedora Local Security Checks	medium
55107	Ubuntu 10.04 LTS / 10.10 / 11.04 : subversion vulnerabilities (USN-1144-1)	Nessus	Ubuntu Local Security Checks	medium
55039	Debian DSA-2251-1 : subversion - several vulnerabilities	Nessus	Debian Local Security Checks	medium
55016	RHEL 5 / 6 : subversion (RHSA-2011:0862)	Nessus	Red Hat Local Security Checks	high
55001	CentOS 5 : subversion (CESA-2011:0862)	Nessus	CentOS Local Security Checks	medium
54964	Mandriva Linux Security Advisory : subversion (MDVSA-2011:106)	Nessus	Mandriva Local Security Checks	medium
54952	FreeBSD : Subversion -- multiple vulnerabilities (e27a1af3-8d21-11e0-a45d-001e8c75030d)	Nessus	FreeBSD Local Security Checks	medium

Detections

Analytics

CVE-2011-1783

high

Tenable Plugins

medium

medium

high

high

medium

critical

critical

critical

medium

medium

medium

medium

medium

high

medium

medium

medium