Description
The TCP/IP stack in multiple operating systems allows remote attackers to cause a denial of service (CPU consumption) via a TCP packet with the correct sequence number but the wrong Acknowledgement number, which generates a large number of "keep alive" packets. NOTE: some followups indicate that this issue could not be replicated.
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- Multiple Vendor - TCP Session Acknowledgement Number Denial of Service EDB-25439 · dos · Dec 13, 2004 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- 20050416 TCP/IP Stack Vulnerability mailing-list
- 20050418 Re: TCP/IP Stack Vulnerability mailing-list
- 13215 vdb-entry
- 20050418 Re: TCP/IP Stack Vulnerability mailing-list
- multiple-tcpip-dos(40502) vdb-entry