#VU2556 Type confusion in PHP - CVE-2015-4147

Vulnerability identifier: #VU2556

Vulnerability risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2015-4147

CWE-ID: CWE-843

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
PHP
Universal components / Libraries / Scripting languages

Vendor: PHP Group

Description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to type confusion in the SoapClient::__call method in ext/soap/soap.c in PHP before 5.4.39, 5.5.x before 5.5.23, and 5.6.x before 5.6.7 does not verify that __default_headers is an array. A remote attacker can trigger memory corruption and execute arbitrary code by providing crafted serialized data with an unexpected data type.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation
Install update from vendor's website.

Vulnerable software versions

PHP: 5.4.0 - 5.4.38, 5.5.0 - 5.5.22, 5.6.0 - 5.6.6

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External links
https://bugs.php.net/bug.php?id=69545

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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.