#VU7273 Server-side request forgery in PHP - CVE-2017-7272

Vulnerability identifier: #VU7273

Vulnerability risk: High

CVSSv4.0: 8.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:N/SA:N/E:P/U:Amber]

CVE-ID: CVE-2017-7272

CWE-ID: CWE-918

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
PHP
Universal components / Libraries / Scripting languages

Vendor: PHP Group

Description
The vulnerability allows a remote user to perform SSRF attack.

The weakness exists due to a flaw in the fsockopen() function. A remote attacker can use fsockopen hostname argument to cause the system to accept it with an expectation that the port number is constrained and perform server-sire request forgery attack.

Successful exploitation of this vulnerability may allow an attacker to perform SSRF attack to retrieve information for further attacks against vulnerable system by performing unauthorized connections to local resources, gain access to sensitive information and compromise vulnerable system.

Mitigation
Update to version 7.1.3.

Vulnerable software versions

PHP: 7.0.11, 7.1.2

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External links
https://www.sec-consult.com/fxdata/seccons/prod/temedia/advisories_txt/20170403-0_PHP_Misbehavior_of_fsockopen_function_v10.txt

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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. However, proof of concept for this vulnerability is available.