Vulnerabilities
Misconfiguration
Runtime Security
Compliance
CVE Vulnerabilities

CVE-2016-2167

Improper Access Control

Published: May 05, 2016 | Modified: Nov 07, 2023
CVSS 3.x
6.8
MEDIUM
Source:
NVD
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
CVSS 2.x
4.9 MEDIUM
AV:N/AC:M/Au:S/C:P/I:P/A:N
RedHat/V2
3.6 LOW
AV:N/AC:H/Au:S/C:P/I:P/A:N
RedHat/V3
Ubuntu
LOW
Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2016-2167
CWEhttps://cwe.mitre.org/data/definitions/284.html

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.

Weakness

The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

Affected Software

Name Vendor Start Version End Version
Subversion Apache * 1.8.15 (including)
Subversion Apache 1.9.0 (including) 1.9.0 (including)
Subversion Apache 1.9.1 (including) 1.9.1 (including)
Subversion Apache 1.9.2 (including) 1.9.2 (including)
Subversion Apache 1.9.3 (including) 1.9.3 (including)
Subversion Ubuntu precise *
Subversion Ubuntu trusty *
Subversion Ubuntu upstream *
Subversion Ubuntu wily *
Subversion Ubuntu xenial *

Extended Description

Access control involves the use of several protection mechanisms such as:

When any mechanism is not applied or otherwise fails, attackers can compromise the security of the product by gaining privileges, reading sensitive information, executing commands, evading detection, etc. There are two distinct behaviors that can introduce access control weaknesses:

Potential Mitigations

  • Compartmentalize the system to have “safe” areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area.
  • Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.

References

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