#VU9695 Deserialization of untrusted data in PHP - CVE-2017-11143

Vulnerability identifier: #VU9695

Vulnerability risk: Low

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-11143

CWE-ID: CWE-502

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 cause DoS condition on the target system.

The weakness exists in parser.c function due to deserialization of untrusted data. A remote attacker can inject specially crafted XML file and crash the PHP interpreter, related to an invalid free for an empty boolean element in ext/wddx/wddx.c.

Successful exploitation of the vulnerability results in denial of service.

Mitigation
Update to version 5.6.31.

Vulnerable software versions

PHP: 5.6.0 - 5.6.31

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External links
https://bugs.php.net/bug.php?id=74145

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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.