PHP Regular Expression Uninitialized Pointer Information Disclosure Vulnerability

August 17th, 2015
ZDI-15-394 ZDI-CAN-2547

CVE ID

CVSS Score

7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected Vendors

PHP

Affected Products

PHP

Vulnerability Details


This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of PHP. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the handling of invalid regular expressions. The issue lies in the failure to properly initialize pointers in a buffer while executing a regular expression. An attacker can leverage this to disclose the contents of any address in memory in the context of the process running PHP.

Additional Details

PHP has issued an update to correct this vulnerability. More details can be found at:
http://vcs.pcre.org/pcre/code/trunk/pcre_exec.c?r1=1502&r2=1510

Disclosure Timeline

  • 2014-10-13 - Vulnerability reported to vendor
  • 2015-08-17 - Coordinated public release of advisory

Credit

Anonymous

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