Re: II-Labs Advisory: Remote code execution in YaBBse 1.5.2 (php version)

From: ScriptSlaveat_private
Date: Sat May 10 2003 - 02:36:37 PDT

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    >SSI.php:
    >------------------------------------------
    >include_once ($sourcedir . '/Errors.php');
    >include_once ($sourcedir . '/Subs.php');
    >include_once ($sourcedir . '/Load.php');    
    >------------------------------------------
    
    You should probably quote the lines above this block, too.
    
    ------------------------------------------
    (Line #031) $full_yabbse_path = '.';
    (Line #048) include_once ($full_yabbse_path . '/Settings.php');
    ------------------------------------------
    
    and you should quote Settings.php:
    
    ------------------------------------------
    (Line #067) $sourcedir = "/home/something/board/Sources";
    ------------------------------------------
    
    so before Errors.php is included, $sourcedir is *always* set to a value,
    overwriting any variable that is passed through the URL.
    
    >We can define $sourcedir variable through URL and include some other
    >PHP script local or remote if remote inclusion is enabled in php.ini file.
    >Bug in not exploitable if PHP's registar_globals is set to off. 
    
    see above - you can't
    
    >Add this line before include_once() lines mentioned above.
    >
    >----cut here----
    >if (!isset($sourcedir)) $sourcedir = "";
    >----cut here----
    
    So you are setting $sourcedir to "" if it isn't set? Whats the point of
    this?
    
    The hole does *not* exist, as the variable $sourcedir is always set to a
    value.  Even if the user did not yet configure YaBB SE, $sourcedir is set to an
    empty value.
    
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