Improper access control in Subversion

1) Improper access control

EUVDB-ID: #VU32288

Risk: Medium

CVSSv4.0: 4.9 [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/E:U/U:Green]

CVE-ID: CVE-2016-2167

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

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.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Subversion: 1.8.0 rc1 - 1.8.15

CPE2.3

• cpe:2.3:a:apache_foundation:subversion:1.8.15:*:*:*:*:*:*:*

External links

https://lists.fedoraproject.org/pipermail/package-announce/2016-May/184545.html
https://lists.opensuse.org/opensuse-updates/2016-05/msg00043.html
https://lists.opensuse.org/opensuse-updates/2016-05/msg00044.html
https://mail-archives.apache.org/mod_mbox/subversion-announce/201604.mbox/%3CCAP_GPNgfn1iKueW51EpmXzXi_URNfGNofZSgOyW1_jnSeNm5DQ@mail.gmail.com%3E
https://mail-archives.apache.org/mod_mbox/subversion-announce/201604.mbox/%3CCAP_GPNgJet+7_MAhomFVOXPgLtewcUw9w=k9zdPCkq5tvPxVMA@mail.gmail.com%3E
https://subversion.apache.org/security/CVE-2016-2167-advisory.txt
https://www.debian.org/security/2016/dsa-3561
https://www.securityfocus.com/bid/89417
https://www.securitytracker.com/id/1035706
https://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.417496
https://security.gentoo.org/glsa/201610-05

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.