Amazon Linux AMI update for subversion

Published: 2016-06-02

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2016-2167 CVE-2016-2168
CWE-ID	CWE-284 CWE-20
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	Amazon Linux AMI Operating systems & Components / Operating system
Vendor	Amazon Web Services

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

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

Update the affected packages:

i686:
    subversion-perl-1.9.4-2.54.amzn1.i686
    subversion-1.9.4-2.54.amzn1.i686
    subversion-javahl-1.9.4-2.54.amzn1.i686
    subversion-devel-1.9.4-2.54.amzn1.i686
    subversion-python26-1.9.4-2.54.amzn1.i686
    subversion-tools-1.9.4-2.54.amzn1.i686
    subversion-ruby-1.9.4-2.54.amzn1.i686
    subversion-debuginfo-1.9.4-2.54.amzn1.i686
    mod24_dav_svn-1.9.4-2.54.amzn1.i686
    subversion-python27-1.9.4-2.54.amzn1.i686
    subversion-libs-1.9.4-2.54.amzn1.i686

src:
    subversion-1.9.4-2.54.amzn1.src

x86_64:
    subversion-python27-1.9.4-2.54.amzn1.x86_64
    subversion-ruby-1.9.4-2.54.amzn1.x86_64
    subversion-tools-1.9.4-2.54.amzn1.x86_64
    subversion-debuginfo-1.9.4-2.54.amzn1.x86_64
    subversion-1.9.4-2.54.amzn1.x86_64
    subversion-perl-1.9.4-2.54.amzn1.x86_64
    subversion-javahl-1.9.4-2.54.amzn1.x86_64
    subversion-devel-1.9.4-2.54.amzn1.x86_64
    subversion-libs-1.9.4-2.54.amzn1.x86_64
    subversion-python26-1.9.4-2.54.amzn1.x86_64
    mod24_dav_svn-1.9.4-2.54.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3

cpe:2.3:o:amazon_web_services:amazon_linux_ami:*:*:*:*:*:*:*:*

External links

https://alas.aws.amazon.com/ALAS-2016-709.html

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.

2) Input validation error

EUVDB-ID: #VU32289