CVE-2016-2167

The canonicalize_username function in svnserve/cyrus_auth.c in Apache Subversion before 1.8.16 and 1.9.x before 1.9.4, when Cyrus SASL authentication is used, allows remote attackers to authenticate and bypass intended access restrictions via a realm string that is a prefix of an expected repository realm string.

The canonicalize_username function in svnserve/cyrus_auth.c in Apache Subversion before 1.8.16 and 1.9.x before 1.9.4, when Cyrus SASL authentication is used, allows remote attackers to authenticate and bypass intended access restrictions via a realm string that is a prefix of an expected repository realm string.

Updated subversion packages fix security vulnerabilities:

Daniel Shahaf and James McCoy discovered that an implementation error in the authentication against the Cyrus SASL library would permit a remote user to specify a realm string which is a prefix of the expected realm string and potentially allowing a user to authenticate using the wrong realm (CVE-2016-2167).

Ivan Zhakov of VisualSVN discovered a remotely triggerable denial of service vulnerability in the mod_authz_svn module during COPY or MOVE authorization check. An authenticated remote attacker could take advantage of this flaw to cause a denial of service (Subversion server crash) via COPY or MOVE requests with specially crafted header (CVE-2016-2168).

These are all security issues fixed in the libsvn_auth_gnome_keyring-1-0-1.9.5-1.1 package on the GA media of openSUSE Tumbleweed.

This update for subversion fixes the following issues:

• CVE-2016-2167: mod_authz_svn: DoS in MOVE/COPY authorization check (bsc#976849)
• CVE-2016-2168: svnserve/sasl may authenticate users using the wrong realm (bsc#976850)

The following non-security bugs were fixed:

• bsc#969159: subversion dependencies did not enforce matching password store
• bsc#911620: svnserve could not be started via YaST Service manager

This update for subversion fixes the following issues:

• CVE-2015-3187: svn_repos_trace_node_locations() reveals paths hidden by authz (bsc#939517)
• CVE-2016-2167: mod_authz_svn: DoS in MOVE/COPY authorization check (bsc#976849)
• CVE-2016-2168: svnserve/sasl may authenticate users using the wrong realm (bsc#976850)

This update for subversion fixes the following issues:

• CVE-2017-9800: A malicious, compromised server or MITM may cause svn client to execute arbitrary commands by sending repository content with svn:externals definitions pointing to crafted svn+ssh URLs. (bsc#1051362)

• Malicious user may commit SHA-1 collisions and cause repository inconsistencies (bsc#1026936)

• CVE-2016-8734: Unrestricted XML entity expansion in mod_dontdothat and Subversion clients using http(s):// could lead to denial of service (bsc#1011552)

• CVE-2016-2167: svnserve/sasl may authenticate users using the wrong realm (bsc#976849)

• CVE-2016-2168: Remotely triggerable DoS vulnerability in mod_authz_svn during COPY/MOVE authorization check (bsc#976850)

• mod_authz_svn: fix authz with mod_auth_kerb/mod_auth_ntlm (bsc#977424)

• make the subversion package conflict with KWallet and Gnome Keyring packages with do not require matching subversion versions in SLE 12 and openSUSE Leap 42.1 and thus break the main package upon partial upgrade. (bsc#969159)

• CVE-2015-5343: Remotely triggerable heap overflow and out-of-bounds read in mod_dav_svn caused by integer overflow when parsing skel-encoded request bodies. (bsc#958300)

• Avoid recommending 180+ new pkgs for installation on minimal setup due subversion-password-store (bsc#942819)

• CVE-2015-3184: mod_authz_svn: mixed anonymous/authenticated httpd (dav) configurations could lead to information leak (bsc#939514)

• CVE-2015-3187: do not leak paths that were hidden by path-based authz (bsc#939517)

• CVE-2015-0202: Subversion HTTP servers with FSFS repositories were vulnerable to a remotely triggerable excessive memory use with certain REPORT requests. (bsc#923793)

• 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. (bsc#923794)

• CVE-2015-0251: Subversion HTTP servers allow spoofing svn:author property values for new revisions (bsc#923795)

• fix sample configuration comments in subversion.conf (bsc#916286)

• fix sysconfig file generation (bsc#911620)

• CVE-2014-3580: mod_dav_svn invalid REPORT requests could lead to denial of service (bsc#909935)

• CVE-2014-8108: mod_dav_svn use of invalid transaction names could lead to denial of service (bsc#909935)

• INSTALL#SQLite says 'Subversion 1.8 requires SQLite version 3.7.12 or above'; therefore I lowered the sqlite requirement to make the subversion run on older system versions, tooi. [bsc#897033]

Joern Schneeweisz discovered that Subversion did not properly handle host names in 'svn+ssh://' URLs. A remote attacker could use this to construct a subversion repository that when accessed could run arbitrary code with the privileges of the user. (CVE-2017-9800)

Daniel Shahaf and James McCoy discovered that Subversion did not properly verify realms when using Cyrus SASL authentication. A remote attacker could use this to possibly bypass intended access restrictions. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-2167)

Florian Weimer discovered that Subversion clients did not properly restrict XML entity expansion when accessing http(s):// URLs. A remote attacker could use this to cause a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-8734)