Improper access control in Subversion - CVE-2016-2167

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Main Vulnerability Database Vulnerabilities #VU32288

Improper access control in Subversion - CVE-2016-2167

Published: May 5, 2016 / Updated: July 28, 2020


Vulnerability identifier: #VU32288
CSH Severity: Medium
CVSS v4: 7.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2016-2167
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote authenticated user to read and manipulate data.

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.


Affected software

Subversion
Amazon Linux AMI
Slackware Linux
Fedora
subversion (Alpine package)
subversion

How to mitigate CVE-2016-2167

Install update from vendor's website.

Subversion - update to 1.8.16
subversion (Alpine package) - update to 1.8.16-r0
subversion - addressed in versions 1.9.4-1.fc23, 1.9.4-1.fc24

External References

Related Security Bulletins