full-disclosure - [FD] [KIS-2014-18] Mantis Bug Tracker <= 1.2.17 (ImportXml.php) PHP Code Injection Vulnerability

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Date: Wed, 31 Dec 2014 19:26:48 +0100
From: Egidio Romano <research@...mainsecurity.com>
To: bugtraq@...urityfocus.com, fulldisclosure@...lists.org
Subject: [FD] [KIS-2014-18] Mantis Bug Tracker <= 1.2.17 (ImportXml.php) PHP
 Code Injection Vulnerability

-----------------------------------------------------------------------------
Mantis Bug Tracker <= 1.2.17 (ImportXml.php) PHP Code Injection Vulnerability
-----------------------------------------------------------------------------

[-] Software Link:

http://www.mantisbt.org/

[-] Affected Versions:

All versions from 1.2.0 to 1.2.17.

[-] Vulnerability Description:

The vulnerable code is located in the /plugins/XmlImportExport/ImportXml.php script:

106.	printf( "Processing cross-references for %s issues...", count( $importedIssues ) );
107.	foreach( $importedIssues as $oldId => $newId ) {
108.		$bugData = bug_get( $newId, true );
109.	
110.		$bugLinkRegexp = '/(^|[^\w])(' . preg_quote( $this->source_->issuelink, '/' ) . ')(\d+)\b/e';
111.		$replacement = '"\\1" . $this->getReplacementString( "\\2", "\\3" )';
112.	
113.		$bugData->description = preg_replace( $bugLinkRegexp, $replacement, $bugData->description );
114.		$bugData->update( true, true );
115.	}

User input passed through the "description" field (and the "issuelink" attribute) of the uploaded XML
file when importing data through the Import/Export plugin is not properly sanitized before being used
in a "preg_replace()" call with the 'e' modifier at line 113. This can be exploited by unauthenticated
attackers to inject and execute arbitrary PHP code by uploading a specially crafted XML file. Successful
exploitation of this vulnerability requires the Import/Export plugin to be enabled (disabled by default).

[-] Solution:

Update to version 1.2.18.

[-] Disclosure Timeline:

[04/10/2014] - Issue reported to http://www.mantisbt.org/bugs/view.php?id=17725
[05/10/2014] - CVE number requested
[06/10/2014] - CVE number assigned
[01/11/2014] - Issue fixed on GitHub
[08/11/2014] - Public disclosure by the vendor on the OSS mailing list
[23/12/2014] - Publication of this advisory

[-] CVE Reference:

The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CVE-2014-7146 to this vulnerability.

[-] Credits:

Vulnerability discovered by Egidio Romano.

[-] Original Advisory:

http://karmainsecurity.com/KIS-2014-18

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