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TUCoPS :: Web BBS :: etc :: b06-4165.htm

XennoBB <= "avatar gallery" Directory Transversal



XennoBB <= "avatar gallery" Directory Transversal
XennoBB <= "avatar gallery" Directory Transversal



--------------------- SUMMARY ---------------------=0D
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Name:=0D
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	XennoBB "avatar gallery" directory transversal (10/8/2006)=0D
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Vendor / Product:=0D
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	XennoBB Group=0D
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http://www.xennobb.com/=0D 
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	Description:=0D
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	The world's most revolutionary and easy to use bulletin board.=0D
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	Revolutionary because it redefines the boundaries of usability=0D
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	and power; from the first version it's a real alternative to=0D
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	the commercial forums out there.=0D
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	How can XennoBB be described in few words? =0D
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	Lightning-speed, stable, SECURED(?) and modern.=0D
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Version(s) Affected:=0D
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	<= 2.1.0=0D
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Severity:=0D
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	Medium=0D
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Impact:=0D
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	Directory transversal (Remote)=0D
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Status:=0D
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	Unpatched=0D
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Discovered by:=0D
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Chris Boulton =0D 
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Original advisory:=0D
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http://www.surfionline.com/security_advisories/20060810_xennobb_avatar_gallery_transversal.txt=0D 
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------------------- DESCRIPTION -------------------=0D
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An exploit exists in the above mentioned versions of XennoBB which=0D
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can be exploited by malicious users to transverse various directories=0D
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on the server.=0D
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Input passed to the "gallery" parameter in profile.php is not properly=0D
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sanitized before being used to open the corresponding directory on the=0D
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file system. This exploit can lead to manipulation of content in higher=0D
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up directories than the script intends.=0D
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--------------------- EXPLOIT ---------------------=0D
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Submit a forged POST request to=0D
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profile.php?action=avatar_gallery&id={your registered user ID here}=0D
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With the following as the POST data:=0D
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category=../../general/=0D
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Successful exploitation leads to images in the /img/general folder=0D
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being shown to the user. A similar process can be used to obtain other=0D
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confidential system documents or images which may exist on the server.=0D
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--------------------- SOLUTION --------------------=0D
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Ensure input is correctly sanitized and invalid/not acceptable=0D
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characters are removed from the gallery POST variable before the=0D
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directory is opened on the server.


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