Description
Cisco PIX 6.3 and 7.0 allows remote attackers to cause a denial of service (blocked new connections) via spoofed TCP packets that cause the PIX to create embryonic connections that that would not produce a valid connection with the end system, including (1) SYN packets with invalid checksums, which do not result in a RST; or, from an external interface, (2) one byte of "meaningless data," or (3) a TTL that is one less than needed to reach the internal destination.
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 2
- Cisco PIX - Spoofed TCP SYN Packets Remote Denial of Service EDB-1338 · dos · Nov 23, 2005 · verified
- Cisco PIX - TCP SYN Packet Denial of Service EDB-26548 · dos · Nov 22, 2005 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- 1015256 vdb-entry
- cisco-pix-ttl-dos(25079) vdb-entry
- cisco-pix-tcp-data-field-dos(25077) vdb-entry
- 24140 vdb-entry
- 15525 vdb-entry
- http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_security_notice09186a0080624a37.html
- 20051122 Cisco PIX TCP Connection Prevention mailing-list
- 20060307 Cisco PIX embryonic state machine 1b data DoS mailing-list
- 20051128 Response to Cisco PIX TCP Connection Prevention vendor-advisory
- 20060307 Cisco PIX embryonic state machine TTL(n-1) DoS mailing-list
- VU#853540 third-party-advisory
- 17670 third-party-advisory
- 20060307 RE: Cisco PIX embryonic state machine 1b data DoS mailing-list
- ADV-2005-2546 vdb-entry
- 20051122 Cisco PIX TCP Connection Prevention mailing-list
- 20051122 Cisco PIX TCP Connection Prevention mailing-list