Arch Linux Security Advisory ASA-201606-6
========================================
Severity: Medium
Date    : 2016-06-08
CVE-ID  : CVE-2016-2167 CVE-2016-2168
Package : subversion
Type    : multiple issues
Remote  : Yes
Link    : https://wiki.archlinux.org/title/CVE

Summary
======
The package subversion before version 1.9.4-1 is vulnerable to
authentication restriction bypass and denial of service.

Resolution
=========
Upgrade to 1.9.4-1.

# pacman -Syu "subversion>=1.9.4-1"

The problems have been fixed upstream in version 1.9.4.

Workaround
=========
None.

Description
==========
- CVE-2016-2167 (authentication restriction bypass)

The canonicalize_username function in svnserve/cyrus_auth.c, 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.

- CVE-2016-2168 (denial of service)

The req_check_access function in the mod_authz_svn module in the httpd
server allows remote authenticated users to cause a denial of service
(NULL pointer dereference and crash) via a crafted header in a (1) MOVE
or (2) COPY request, involving an authorization check.

Impact
=====
A remote attacker is able to bypass authentication restrictions under
certain circumstances by authenticating to an unexpected repository
realm or perform a denial of service attack via a request with a
specially crafted header.

References
=========
https://access.redhat.com/security/cve/CVE-2016-2167
https://access.redhat.com/security/cve/CVE-2016-2168
https://subversion.apache.org/security/CVE-2016-2167-advisory.txt
https://subversion.apache.org/security/CVE-2016-2168-advisory.txt