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

[Egidio Romano <research@xxxxxxxxxxxxxxxxxxx>]

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