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.
http://lists.fedoraproject.org/pipermail/package-announce/2016-May/184545.html
http://lists.opensuse.org/opensuse-updates/2016-05/msg00043.html
http://lists.opensuse.org/opensuse-updates/2016-05/msg00044.html
http://mail-archives.apache.org/mod_mbox/subversion-announce/201604.mbox/%[email protected].com%3E
http://mail-archives.apache.org/mod_mbox/subversion-announce/201604.mbox/%[email protected].com%3E
http://subversion.apache.org/security/CVE-2016-2167-advisory.txt
http://www.debian.org/security/2016/dsa-3561
http://www.securityfocus.com/bid/89417
http://www.securitytracker.com/id/1035706
http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.417496
Source: MITRE
Published: 2016-05-05
Updated: 2020-10-20
Type: CWE-284
Base Score: 4.9
Vector: AV:N/AC:M/Au:S/C:P/I:P/A:N
Impact Score: 4.9
Exploitability Score: 6.8
Severity: MEDIUM
Base Score: 6.8
Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Impact Score: 5.2
Exploitability Score: 1.6
Severity: MEDIUM