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+Upstream-Status: Backport [ https://subversion.apache.org/security/CVE-2020-17525-advisory.txt ] 
+CVE: CVE-2020-17525
+Signed-off-by: Chee Yang Lee <chee.yang.lee@intel.com>
+
+  Remote unauthenticated denial-of-service in Subversion mod_authz_svn.
+
+Summary:
+========
+
+  Subversion's mod_authz_svn module will crash if the server is using
+  in-repository authz rules with the AuthzSVNReposRelativeAccessFile
+  option and a client sends a request for a non-existing repository URL.
+
+  This can lead to disruption for users of the service.
+
+Known vulnerable:
+=================
+
+  mod_dav_svn+mod_authz_svn servers 1.9.0 through 1.10.6 (inclusive).
+  mod_dav_svn+mod_authz_svn servers 1.11.0 through 1.14.0 (inclusive).
+
+Known fixed:
+============
+
+  mod_dav_svn+mod_authz_svn servers 1.14.1
+  mod_dav_svn+mod_authz_svn servers 1.10.7
+
+Details:
+========
+
+  A null-pointer-dereference has been found in mod_authz_svn that results in
+  a remote unauthenticated Denial-of-Service in some server configurations.
+
+  The vulnerability can be triggered by an unauthenticated user if the
+  Apache HTTPD server is configured to use an in-repository authz file,
+  with configuration directives such as:
+
+    AuthzSVNAccessFile "^/authz"
+    AuthzSVNReposRelativeAccessFile "^/authz"
+
+  The problem originates when sending a GET request to a non-existent
+  repository. The mod_authz_svn module will attempt to find authz rules
+  at a path within the requested SVN repository. Upon constructing this
+  path, the function svn_repos_find_root_path will return a NULL pointer
+  since the requested repository does not exist on-disk.
+  A check for this legitimate NULL pointer condition is missing, which
+  results in a segmentation fault when the NULL pointer is used.
+
+  The in-repository authz feature was first introduced in Subversion 1.8:
+  https://subversion.apache.org/docs/release-notes/1.8.html#in-repo-authz
+
+  The missing NULL check was first introduced during refactoring of the
+  authz code during development work leading up to Subversion 1.9.
+  Subversion 1.8 servers are unaffected.
+
+Severity:
+=========
+
+  CVSSv3 Base Score: 7.5 (High)
+
+  CVSSv3 Base Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
+
+  Exploitation results in denial of service by crashing the HTTPD worker
+  handling the request. The impact of this differs depending on how the
+  Apache HTTPD server is configured, including the choice of MPM (Multi-
+  Processing-Module). If the worker shares its memory address space with
+  the main thread, as is the case with e.g. the Event MPM, the entire
+  HTTPD server process will terminate. If the pre-fork MPM is used, the
+  worker will terminate but the HTTPD server will stay up, and service
+  availability will depend on how frequently the attacker is able to
+  send malicious requests which target the vulnerability.
+
+Recommendations:
+================
+
+  We recommend all users to upgrade to a known fixed release of the
+  Subversion mod_dav_svn server.
+
+  Users who are unable to upgrade may apply the included patches.
+
+  As a workaround, the use of in-repository authz rules files with
+  the AuthzSVNReposRelativeAccessFile can be avoided by switching
+  to an alternative configuration which fetches an authz rules file
+  from the server's filesystem, rather than from an SVN repository.
+
+References:
+===========
+
+  CVE-2020-17525 (Subversion)
+
+Reported by:
+============
+
+  Thomas Åkesson, simonsoft.se
+
+Patches:
+========
+
+  Patch for Subversion 1.10, 1.14:
+
+[[[
+Index: subversion/libsvn_repos/config_file.c
+===================================================================
+--- a/subversion/libsvn_repos/config_file.c     (revision 1883994)
++++ b/subversion/libsvn_repos/config_file.c     (working copy)
+@@ -237,6 +237,10 @@ get_repos_config(svn_stream_t **stream,
+     {
+       /* Search for a repository in the full path. */
+       repos_root_dirent = svn_repos_find_root_path(dirent, scratch_pool);
++      if (repos_root_dirent == NULL)
++        return svn_error_trace(handle_missing_file(stream, checksum, access,
++                                                   url, must_exist,
++                                                   svn_node_none));
+ 
+       /* Attempt to open a repository at repos_root_dirent. */
+       SVN_ERR(svn_repos_open3(&access->repos, repos_root_dirent, NULL,
+]]]