Bug 1247249 (CVE-2015-3184)

Summary: CVE-2015-3184 subversion: Mixed anonymous/authenticated path-based authz with httpd 2.4
Product: [Other] Security Response Reporter: Vasyl Kaigorodov <vkaigoro>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: huzaifas, jorton, jrusnack, security-response-team, sisharma
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Subversion 1.8.14, Subversion 1.7.21 Doc Type: Bug Fix
Doc Text:
It was found that the mod_authz_svn module did not properly restrict anonymous access to Subversion repositories under certain configurations when used with Apache httpd 2.4.x. This could allow a user to anonymously access files in a Subversion repository, which should only be accessible to authenticated users.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2015-09-15 05:59:16 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: 1242733, 1250879, 1252262    
Bug Blocks: 1247253    
Attachments:
Description Flags
svn1.7.20.patch
none
svn1.8.patch none

Description Vasyl Kaigorodov 2015-07-27 15:58:38 UTC 
Below is the upstream report about a security issue in Subversion:

Summary
=======

  Subversion's mod_authz_svn does not properly restrict anonymous
  access in some mixed anonymous/authenticated environments when using
  Apache httpd 2.4.  The result is that anonymous access may be possible
  to files for which only authenticated access should be possible.

Known vulnerable
================

  CVE-2015-3185 Apache httpd 2.4.0 to 2.4.12
  CVE-2015-3184 Apache Subversion 1.8.0 to 1.8.13
  CVE-2015-3184 Apache Subversion 1.7.0 to 1.7.20

  Servers are vulnerable if either httpd or Subversion is as listed.

  Subversion 1.6 does not build with httpd 2.4 and servers using
  httpd 2.2 are not vulnerable.  Servers that are configured to deny
  anonymous access are not vulnerable.

Known fixed
===========

  Apache httpd 2.4.13
  Apache Subversion 1.8.14 and 1.7.21

  Both httpd and Subversion need to be updated.

Details
=======

  If you have a Subversion repository configured for anonymous read
  that has mod_authz_svn configured such that some portion of the
  repository is hidden from an anonymous user, then in certain cases
  when Subversion is used with Apache httpd 2.4.x the file contents of
  the repository may be exposed to someone who knows the path name
  within the repository.  The protected files and directories will not
  show on directory listings.  Protected directories that do not show
  in their parent will return an empty directory listing rather than a
  403 error.  Protected files will return the full content of the
  file.  Specifically the conditions required for this to happen is
  that there needs to be a <Directory> block for the DocumentRoot
  allowing access to everyone (e.g. Require all granted) and "Satisfy
  any" must not be set.  This sort of configuration is included in the
  default httpd.conf that `make install` provides and is fairly
  standard.

Severity
========

  CVSSv2 Base Score: 4.3
  CVSSv2 Base Vector: AV:N/AC:M/Au:N/C:P/I:N/A:N

  The repository needs to be configured with mixed anonymous and
  authenticated path-based authz and the the attacker needs to know
  the paths to files in the repository that require authentication.

Acknowledgements:

Red Hat would like to thank Apache Software Foundation for reporting this issue. Upstream acknowledges C. Michael Pilato, CollabNet, as the original reporter.

Statement:

This issue did not affect versions of subversion as shipped with Red Hat Enterprise Linux 5 and 6.
Comment 1 Vasyl Kaigorodov 2015-07-27 16:05:12 UTC 
Created attachment 1056673 [details]
svn1.7.20.patch
Comment 2 Vasyl Kaigorodov 2015-07-27 16:05:15 UTC 
Created attachment 1056674 [details]
svn1.8.patch
Comment 5 Tomas Hoger 2015-07-29 14:39:11 UTC 
The fix for this issue depends on httpd fix for CVE-2015-3185 (bug 1243888).
Comment 7 Martin Prpič 2015-08-06 08:29:49 UTC 
External References:

http://subversion.apache.org/security/CVE-2015-3184-advisory.txt
Comment 8 Martin Prpič 2015-08-06 08:33:17 UTC 
Created subversion tracking bugs for this issue:

Affects: fedora-all [bug 1250879]
Comment 14 errata-xmlrpc 2015-09-08 13:10:22 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:1742 https://rhn.redhat.com/errata/RHSA-2015-1742.html
Comment 15 Fedora Update System 2016-02-29 22:21:56 UTC 
subversion-1.8.15-1.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.