Vulnerability identifier: #VU593

Vulnerability 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

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
macOS
Operating systems & Components / Operating system
macOS Server
Operating systems & Components / Operating system

Vendor: Apple Inc.

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

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

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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.