Vulnerability identifier: #VU16919

Vulnerability risk: Low

CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-264

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 the function spl_autoload converts class name to lower case and later tries to free this string. A remote attacker can trigger spl_autoload segfault and cause the service to crash.

Mitigation
Update to version 7.3.1.

Vulnerable software versions

PHP: 7.3.0 - 7.3.0beta3

---

External links
http://bugs.php.net/bug.php?id=77359

---

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.