phpBB NULL byte file upload

phpbb-nullbyte-file-upload (28884) The risk level is classified as MediumMedium Risk

Description:

phpBB and possibly other PHP applications could allow a remote attacker to upload arbitrary files. A remote attacker could upload a malicious image file appending the filename with NULL (%00) bytes, which could allow the attacker to upload and execute arbitrary PHP code on the vulnerable Web server.

Platforms Affected:

  • Debian, Debian Linux 3.1
  • Debian, Debian Linux 4.0
  • phpBB, phpBB 2.0.21

Remedy:

Upgrade to the latest version of phpBB (2.0.22 or later), available from the phpBB Web site. See References.

Consequences:

Gain Access

References:

  • BugTraq Mailing List, Mon Sep 11 2006 - 16:33:56 CDT , ShAnKaR: multiple PHP application poison NULL byte vulnerability at http://archives.neohapsis.com/archives/bugtraq/2006-09/0168.html.
  • phpBB Web site, phpBB:: Creating Communities at http://www.phpbb.com/.
  • BID-20347: phpBB Avatar_Path PHP Code Execution Vulnerability
  • BID-21806: PHPBB Multiple Input Validation Vulnerabilities
  • CVE-2006-4758: phpBB 2.0.21 does not properly handle pathnames ending in %00, which allows remote authenticated administrative users to upload arbitrary files, as demonstrated by a query to admin/admin_board.php with an avatar_path parameter ending in .php%00.
  • DSA-1488: phpbb2 -- several vulnerabilities
  • SA22188: phpBB "avatar_path" PHP Code Execution Vulnerability

Reported:

Sep 11, 2006

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