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Published: 05 May 2016

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.

From the Ubuntu security team

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.



CVSS 3 base score: 6.8


Package Release Status
Launchpad, Ubuntu, Debian
Released (1.9.4-1)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (1.9.3-2ubuntu1.1)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was released [1.8.8-1ubuntu3.3])