Traffic proxy in Apple MAC OS X

Published: 2016-09-21 | Updated: 2017-01-06

Risk	Low
Patch available	YES
Number of vulnerabilities	1
CVE-ID	CVE-2016-4694
CWE-ID	CWE-300
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	macOS Operating systems & Components / Operating system macOS Server Operating systems & Components / Operating system
Vendor	Apple Inc.

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Traffic proxy

EUVDB-ID: #VU593

Risk: Low

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-4694

CWE-ID: CWE-300 - Channel Accessible by Non-Endpoint ('Man-in-the-Middle')

Exploit availability: No

Description

The vulnerability allows a remote user to proxy traffic to an arbitrary server.
The weakness exists due to usage of variable HTTP_PROXY by macOS Server CGI applications. Under the influence of specially crafted and sent HTTP "Proxy:" the target CGI application may proxy HTTP connections to an arbitrary port on an arbitrary server.
Successful exploitation of the vulnerability leads to proxying traffic to an arbitrary server.

Mitigation

Update to 5.2.

Vulnerable software versions

macOS: 15.0.0 - 15.6.0

macOS Server: 5.0 - 5.1

CPE2.3

External links

http://support.apple.com/en-us/HT207171
http://support.apple.com/kb/HT207170
http://support.apple.com/en-us/HT207171

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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