Multiple Cisco Anomaly Detection and Mitigation products TACACS+ authentication bypass
| cisco-tacacs-auth-bypass (24689) |  Medium Risk |
Description:
Multiple Cisco Guard and Cisco Traffic Anomaly Detector appliances and modules running software versions 5.0(1) and 5.0(3) could allow a remote attacker to bypass authentication and gain unauthorized access or elevated privileges on affected devices. If Terminal Access Controller Access Control System Plus (TACACS+) is used for authentication, but a TACACS+ server is not specified, an attacker could bypass authentication and possibly gain complete control over the affected device.
Note: Privileges are limited based on the type of account the attacker uses to exploit this vulnerability. If the attacker uses a non-existent account, the attacker will be granted privileges to execute 'show' commands only.
*CVSS:
| Base Score: | 4.8 |
| Access Vector: | Remote |
| Access Complexity: | High |
| Authentication: | Required |
| Confidentiality Impact: | Complete |
| Integrity Impact: | Complete |
| Availability Impact: | Complete |
| Temporal Score: | 3.5 |
| Exploitability: | Unproven |
| Remediation Level: | Official-Fix |
| Report Confidence: | Confirmed |
Consequences:
Bypass Security
Remedy:
Upgrade to the latest software version for Cisco Guard and Cisco Traffic Anomaly Detector appliances (5.1(4) or later), as listed in Cisco Security Advisory cisco-SA-20060215-guard-auth. See References.
References:
- CIAC Information Bulletin Q-125: TACACS+ Authentication Bypass in Cisco Anomaly Detection and Mitigation Products.
- cisco-SA-20060215-guard-auth: Cisco Security Advisory: TACACS+ Authentication Bypass in Cisco Anomaly Detection and Mitigation Products.
- BID-16661: Cisco Multiple Products TACACS+ Authentication Bypass Vulnerability
- CVE-2006-0764: The Authentication, Authorization, and Accounting (AAA) capability in versions 5.0(1) and 5.0(3) of the software used by multiple Cisco Anomaly Detection and Mitigation products, when running with an incomplete TACACS+ configuration without a tacacs-server host command, allows remote attackers to bypass authentication and gain privileges, aka Bug ID CSCsd21455.
- OSVDB ID: 23237: Cisco Multiple Product Misconfigured TACACS+ Server Authentication Bypass
- SA18904: Cisco Products TACACS+ Authentication Bypass
- SECTRACK ID: 1015637: Cisco Guard May Let Remote Users Bypass TACACS+ Authentication
- SECTRACK ID: 1015638: Cisco Traffic Anomaly Detector May Let Remote Users Bypass TACACS+ Authentication
- VUPEN/ADV-2006-0612: Cisco Anomaly Detection and Mitigation TACACS+ Authentication Bypass
Platforms Affected:
- Cisco 7600 Router
- Cisco Catalyst 6500
- Cisco Guard 5.0(1)
- Cisco Guard 5.0(3)
- Cisco Traffic Anomaly Detector module 5.0(1)
- Cisco Traffic Anomaly Detector module 5.0(3)
Reported:
Feb 15, 2006
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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.