NULL pointer dereference in PHP

1) NULL pointer dereference

EUVDB-ID: #VU31247

Risk: Medium

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:Green]

CVE-ID: CVE-2018-14884

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

An issue was discovered in PHP 7.0.x before 7.0.27, 7.1.x before 7.1.13, and 7.2.x before 7.2.1. Inappropriately parsing an HTTP response leads to a segmentation fault because http_header_value in ext/standard/http_fopen_wrapper.c can be a NULL value that is mishandled in an atoi call.

Mitigation

Install update from vendor's website.

Vulnerable software versions

PHP: 7.2.0

CPE2.3

• cpe:2.3:a:php_group:php:7.2.0:*:*:*:*:*:*:*

External links

https://php.net/ChangeLog-7.php
https://access.redhat.com/errata/RHSA-2019:2519
https://bugs.php.net/bug.php?id=75535
https://security.netapp.com/advisory/ntap-20181107-0003/

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.