Cisco ASA and Cisco PIX Transport Layer Security (TLS) denial of service
| cisco-pix-asa-tls-dos (42836) |  Medium Risk |
Description:
Cisco ASA and Cisco PIX devices are vulnerable to a denial of service, caused by an error when Clientless WebVPN, SSL VPN Client, AnyConnect Connections, ASDM (HTTPS) Management Sessions, Cut-Through Proxy for Network Access, or TLS Proxy for Encrypted Voice Inspection is enabled. By sending a specially-crafted Transport Layer Security (TLS) packet, a remote attacker could exploit this vulnerability to cause the device to reload.
*CVSS:
| Base Score: | 7.1 |
| Access Vector: | Network |
| Access Complexity: | Medium |
| Authentication: | None |
| Confidentiality Impact: | None |
| Integrity Impact: | None |
| Availability Impact: | Complete |
| Temporal Score: | 5.3 |
| Exploitability: | Unproven |
| Remediation Level: | Official-Fix |
| Report Confidence: | Confirmed |
Consequences:
Denial of Service
Remedy:
Refer to cisco-sa-20080604-asa for patch, upgrade or suggested workaround information. See References.
References:
- cisco-sa-20080604-asa: Multiple Vulnerabilities in Cisco PIX and Cisco ASA.
- CVE-2008-2056: Cisco Adaptive Security Appliance (ASA) and Cisco PIX security appliance 8.0.x before 8.0(3)9 and 8.1.x before 8.1(1)1 allows remote attackers to cause a denial of service (device reload) via a crafted Transport Layer Security (TLS) packet to the device interface.
- SA30552: Cisco ASA and PIX Security Appliances Multiple Vulnerabilities
- SECTRACK ID: 1020178: Cisco PIX Firewall TLS Processing Bug Lets Remote Users Deny Service
- SECTRACK ID: 1020179: Cisco ASA TLS Processing Bug Lets Remote Users Deny Service
- VUPEN/ADV-2008-1750: Cisco PIX and ASA Security Bypass and Denial of Service Vulnerabilities
Platforms Affected:
- Cisco Adaptive Security Appliance 8.0
- Cisco Adaptive Security Appliance 8.1
- Cisco PIX Security Appliance 8.0
- Cisco PIX Security Appliance 8.1
Reported:
Jun 04, 2008
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* According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.
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.