Denial of service in PHP

1) Resource exhaustion

EUVDB-ID: #VU10880

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: CVE-2015-9253

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists in the php-fpm master process due to improper processing of crafted PHP scripts. A remote attacker can send a specially crafted PHP script, trigger the php-fpm master process to restart a child process and cause the php-fpm master process the php-fpm master process to consume all available CPU resources and excessive amounts of disk space that results in denial of service.

Mitigation

Update to version 7.2.3.

Vulnerable software versions

PHP: 5.4.0 - 7.2.2

CPE2.3

• cpe:2.3:a:php_group:php:5.4.0:*:*:*:*:*:*:*
• cpe:2.3:a:php_group:php:5.4.1:*:*:*:*:*:*:*
• cpe:2.3:a:php_group:php:5.4.2:*:*:*:*:*:*:*
• cpe:2.3:a:php_group:php:5.4.3:*:*:*:*:*:*:*
• cpe:2.3:a:php_group:php:5.4.4:*:*:*:*:*:*:*
• cpe:2.3:a:php_group:php:5.4.5:*:*:*:*:*:*:*
• cpe:2.3:a:php_group:php:5.4.6:*:*:*:*:*:*:*
• cpe:2.3:a:php_group:php:5.4.7:*:*:*:*:*:*:*
• cpe:2.3:a:php_group:php:5.4.8:*:*:*:*:*:*:*
• cpe:2.3:a:php_group:php:5.4.9:*:*:*:*:*:*:*

External links

https://bugs.php.net/bug.php?id=70185
https://bugs.php.net/bug.php?id=73342
https://bugs.php.net/bug.php?id=75968

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.