CVE-2016-2167
Published: 5 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.
Priority
Status
| Package | Release | Status |
|---|---|---|
|
subversion Launchpad, Ubuntu, Debian |
artful |
Not vulnerable
(1.9.4-1ubuntu1)
|
| precise |
Ignored
(end of life)
|
|
| trusty |
Released
(1.8.8-1ubuntu3.3)
|
|
| upstream |
Released
(1.9.4-1)
|
|
| wily |
Ignored
(end of life)
|
|
| xenial |
Released
(1.9.3-2ubuntu1.1)
|
|
| yakkety |
Not vulnerable
(1.9.4-1ubuntu1)
|
|
| zesty |
Not vulnerable
(1.9.4-1ubuntu1)
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 6.8 |
| Attack vector | Network |
| Attack complexity | High |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | None |
| Vector | CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N |