Description
The Cisco Network Admission Control (NAC) 3.6.4.1 and earlier allows remote attackers to prevent installation of the Cisco Clean Access (CCA) Agent and bypass local and remote protection mechanisms by modifying (1) the HTTP User-Agent header or (2) the behavior of the TCP/IP stack. NOTE: the vendor has disputed the severity of this issue, stating that users cannot bypass authentication mechanisms.
References
- 20050822 RE: Cisco Clean Access Agent (Perfigo) bypass mailing-list
- 19726 vdb-entry
- 20060829 Re: Cisco NAC Appliance Agent Installation Bypass Vulnerability mailing-list
- 20060822 Response to BugTraq - Cisco Clean Access Agent (Perfigo) Bypass vendor-advisory
- 20050819 Cisco Clean Access Agent (Perfigo) bypass mailing-list
- 20060826 NAC Agent Installation Bypass vendor-advisory
- 20060826 Re: Cisco NAC Appliance Agent Installation Bypass Vulnerability mailing-list
- 20060826 Cisco NAC Appliance Agent Installation Bypass Vulnerability mailing-list