Input validation error in PHP

1) Input validation error

EUVDB-ID: #VU32405

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2015-5589

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

The phar_convert_to_other function in ext/phar/phar_object.c in PHP before 5.4.43, 5.5.x before 5.5.27, and 5.6.x before 5.6.11 does not validate a file pointer before a close operation, which allows remote attackers to cause a denial of service (segmentation fault) or possibly have unspecified other impact via a crafted TAR archive that is mishandled in a Phar::convertToData call.

Mitigation

Install update from vendor's website.

Vulnerable software versions

PHP: 5.4.0 - 5.6.10

External links

http://git.php.net/?p=php-src.git;a=commit;h=bf58162ddf970f63502837f366930e44d6a992cf
http://openwall.com/lists/oss-security/2015/07/18/1
http://php.net/ChangeLog-5.php
http://www.debian.org/security/2015/dsa-3344
http://www.securityfocus.com/bid/75974
http://bugs.php.net/bug.php?id=69958

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.