#VU40511 Input validation error in PHP - CVE-2016-1904

Vulnerability identifier: #VU40511

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2016-1904

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
PHP
Universal components / Libraries / Scripting languages

Vendor: PHP Group

Description

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

Multiple integer overflows in ext/standard/exec.c in PHP 7.x before 7.0.2 allow remote attackers to cause a denial of service or possibly have unspecified other impact via a long string to the (1) php_escape_shell_cmd or (2) php_escape_shell_arg function, leading to a heap-based buffer overflow.

Mitigation
Install update from vendor's website.

Vulnerable software versions

PHP: 7.0.0 - 7.0.1

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External links
https://www.openwall.com/lists/oss-security/2016/01/14/8
https://www.php.net/ChangeLog-7.php
https://www.securitytracker.com/id/1034608
https://bugs.php.net/bug.php?id=71270
https://github.com/php/php-src/commit/2871c70efaaaa0f102557a17c727fd4d5204dd4b

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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.