phpBB up to 2.0.17 Security Check array_merge _session cross site scripting

CVSS Meta Temp Score
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CTI Interest Score
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6.0$0-$5k0.00

A vulnerability was found in phpBB (Forum Software) and classified as critical. Affected by this issue is the function array_merge of the component Security Check. The manipulation of the argument _session with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-80. The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages. Impacted is confidentiality, integrity, and availability. CVE summarizes:

phpBB 2.0.17 and earlier, when register_globals is enabled and the session_start function has not been called to handle a session, allows remote attackers to bypass security checks by setting the $_SESSION and $HTTP_SESSION_VARS variables to strings instead of arrays, which causes an array_merge function call to fail.

The bug was discovered 08/14/2005. The weakness was disclosed 10/31/2005 by Stefan Esser with Hardened-PHP Project (Website). The advisory is available at hardened-php.net. This vulnerability is handled as CVE-2005-3416 since 11/01/2005. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

The vulnerability was handled as a non-public zero-day exploit for at least 78 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 22791 (Debian DSA-925-1 : phpbb2 - several vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l.

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (23967) and Tenable (22791). The entries 27254, 26821, 26766 and 26765 are pretty similar.

Productinfo

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Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
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CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Cross site scripting
CWE: CWE-80 / CWE-74 / CWE-707
ATT&CK: T1059.007

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

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EPSS Percentile: 🔍

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Current Price Estimation: 🔍

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Nessus ID: 22791
Nessus Name: Debian DSA-925-1 : phpbb2 - several vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
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OpenVAS ID: 56053
OpenVAS Name: Debian Security Advisory DSA 925-1 (phpbb2)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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Timelineinfo

08/14/2005 🔍
10/31/2005 +78 days 🔍
10/31/2005 +0 days 🔍
10/31/2005 +0 days 🔍
10/31/2005 +0 days 🔍
10/31/2005 +0 days 🔍
11/01/2005 +0 days 🔍
11/01/2005 +0 days 🔍
11/21/2005 +20 days 🔍
12/22/2005 +31 days 🔍
10/14/2006 +296 days 🔍
03/11/2015 +3070 days 🔍
06/11/2019 +1553 days 🔍

Sourcesinfo

Product: phpbb.com

Advisory: hardened-php.net
Researcher: Stefan Esser
Organization: Hardened-PHP Project
Status: Confirmed

CVE: CVE-2005-3416 (🔍)
X-Force: 23967
SecurityTracker: 1015121
Vulnerability Center: 9716 - phpBB <2.0.18 Restrictions Bypass via $_SESSION \x26 $HTTP_SESSION_VARS Parameters, High
SecurityFocus: 15243 - PHPBB Global Variable Deregistration Bypass Vulnerabilities
Secunia: 17366 - phpBB Multiple Vulnerabilities, Highly Critical
OSVDB: 20413 - phpBB Crafted HTTP_SESSION_VARS Variable register_globals Bypass

See also: 🔍

Entryinfo

Created: 03/11/2015 23:39
Updated: 06/11/2019 16:45
Changes: 03/11/2015 23:39 (78), 06/11/2019 16:45 (11)
Complete: 🔍

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