20413 : phpBB Crafted HTTP_SESSION_VARS Variable register_globals Bypass
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Views This Week	Views All Time	Added to OSVDB	Last Modified	Modified (since 2008)	Percent Complete
2	588	over 6 years ago	over 3 years ago	0 times	90%

Timeline

Discovery Date	Disclosure Date
2005-08-14	2005-10-31

Description

phpBB contains a flaw that may allow a remote attacker to bypass the globals deregistration code (register_globals). The flaw exists because the application starts not knowing the values of the $_SESSION or $HTTP_SESSION_VARS variables. It is possible a user can supply arbitrary values to these variables which will cause the register_globals setting to be ignored, allowing for cross-site scripting or SQL injection attacks.

Classification

Location: Remote / Network Access
Attack Type: Input Manipulation
Impact: Loss of Integrity
Exploit: Exploit Rumored
Disclosure: OSVDB Verified, Vendor Verified
OSVDB: Web Related

Technical

This vulnerability is only present when the register_globals PHP option is set to 'on'. This has not been the default setting for PHP installs since version 4.2.0 (22-Apr-2002).

Solution

Upgrade to version 2.0.18 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.

Products

phpBB Group

phpBB

2.0.17

References

Security Tracker: 1015121
Bugtraq ID: 15243
Secunia Advisory ID: 17366 18098
CVE ID: 2005-3416 (see also: NVD)
Related OSVDB ID: 20386 20387 20388 20389 20390 20391 20414
ISS X-Force ID: 22914
Mail List Post: http://archives.neohapsis.com/archives/fulldisclosure/2005-10/0637.html
Vendor Specific Advisory URL: http://www.debian.org/security/2005/dsa-925
Other Advisory URL: http://www.hardened-php.net/advisory_172005.75.html
Vendor Specific News/Changelog Entry: http://www.phpbb.com/support/documents.php?mode=changelog#2017

Tools & Filters

	20132 22791
	3163

Credit

Stefan Esser - sesserhardened-php.net - www.hardened-php.net

CVSSv2 Score

CVSSv2 Base Score = 7.5
Source: nvd.nist.gov | Generated: 2005-11-03 | Disagree?

Blogs

This product uses the Daylife API but is not endorsed or certified by Daylife.

This section lists the latest news and blogs found via the daylife API (and for older items, the technorati API), which mention or otherwise discuss this vulnerability.

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