Description
Cisco DSL CPE devices running CBOS 2.4.4 and earlier allows remote attackers to cause a denial of service (hang or memory consumption) via (1) a large packet to the DHCP port, (2) a large packet to the Telnet port, or (3) a flood of large packets to the CPE, which causes the TCP/IP stack to consume large amounts of memory.
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
- Cisco CBOS 2.x - Broadband Operating System TCP/IP Stack Denial of Service EDB-21472 · dos · May 23, 2002 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- 20020523 CBOS - Improving Resilience to Denial-of-Service Attacks vendor-advisory
- 4813 vdb-entry
- cisco-cbos-telnet-cpe-dos(9152) vdb-entry
- 4814 vdb-entry
- cisco-cbos-tcpip-dos(9153) vdb-entry
- cisco-cbos-dhcp-dos(9151) vdb-entry
- 4815 vdb-entry