#VU16903 NULL pointer dereference in PHP

Vulnerability identifier: #VU16903

Vulnerability risk: Low

CVSSv4.0: 7.7 [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:P/U:Clear]

CVE-ID: N/A

CWE-ID: CWE-476

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 due to `serialize` will try to get all properties of the class by `zend_get_properties_for` when trying to `serialize` a class. A remote attacker can make `com` and `com_safearray_proxy` return NULL in `com_properties_get` so it will crash on `zend_array_count` and cause serializing or unserializing COM objects to crash.

Mitigation
The vulnerability has been fixed in the versions 7.2.14, 7.3.1.

Vulnerable software versions

PHP: 7.2.0 - 7.2.13, 7.3.0alpha1 - 7.3.0

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External links
https://bugs.php.net/bug.php?id=77177

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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.