Title: Cisco PIX and ASA Multiple Denial of Service, ACL Bypass, and Authentication Bypass Vulnerabilities
Severity: HIGH
Description:
Cisco PIX Security Appliance and ASA 5500 Series Adaptive Security Appliance are security devices.
The appliances are prone to the following security vulnerabilities:
1. An authentication-bypass vulnerability affects the VPN override account feature. Attackers can bypass configuration options from an AAA server for a WebVPN tunnel to log in to a VPN without valid credentials. This issue is tracked by CVE-2009-1155 and further documented by Cisco Bug ID CSCsx47543.
2. A denial-of-service vulnerability can be triggered by a specially crafted SSL or HTTP packet. This issue affects ASA devices that are configured to terminate SSL VPN connections or that have an interface with ASDM access enabled. Attackers can cause an affected device to reload. This issue is tracked by CVE-2009-1156 and further documented by Cisco Bug ID CSCsv52239.
3. A denial-of-service vulnerability affects ASA or PIX devices configured with any of these features:
SSL VPNs
ASDM Administrative Access
Telnet Access
SSH Access
cTCP for Remote Access VPNs
Virtual Telnet
Virtual HTTP
TLS Proxy for Encrypted Voice Inspection
Cut-Through Proxy for Network Access
TCP Intercept
This issue can be triggered with specially crafted TCP packets. When the device processes the malicious packets, a memory leak occurs, resulting in a sustained denial-of-service condition. This issue is tracked by CVE-2009-1157 and further documented by Cisco Bug ID CSCsy22484.
4. A denial-of-service vulnerability can be triggered with specially crafted H.323 packets on ASA devices configured with H.323 inspection. Note that H.323 inspection is enabled by default. Attackers can exploit this issue to cause an affected device to reload. This issue is tracked by CVE-2009-1158 and further documented by Cisco Bug ID CSCsx32675.
5. A denial-of-service vulnerability can be triggered with specially crafted SQL*Net packets over TCP port 1521 on ASA and PIX devices configured with SQL*Net inspection. Note that SQL*Net inspection is enabled by default. A successful exploit of this issue requires a three-way TCP handshake. Attackers can exploit this issue to cause an affected device to reload. This issue is tracked by CVE-2009-1159 and further documented by Cisco Bug ID CSCsw51809.
6. An Access Control List (ACL) bypass vulnerability occurs because affected devices may ignore the implicit deny behavior that is applied to inbound packets following the completion of explicit permit or deny rules. Attackers can exploit this issue to bypass security rules. This may aid in further attacks. This issue is tracked by CVE-2009-1160 and further documented by Cisco Bug ID CSCsq91277.
Affected Products:
- Cisco PIX/ASA 7.0
- Cisco PIX/ASA 7.1
- Cisco PIX/ASA 7.2
- Cisco PIX/ASA 8.0
- Cisco PIX/ASA 8.1
References:
- CVE: CVE-2009-1155
- CVE: CVE-2009-1156
- CVE: CVE-2009-1157
- CVE: CVE-2009-1158
- CVE: CVE-2009-1159
- CVE: CVE-2009-1160
- Cisco: Cisco Homepage
- Cisco: Cisco Security Advisory: Multiple Vulnerabilities in Cisco ASA Adaptive Security
- cisco: Cisco Applied Mitigation Bulletin: Identifying and Mitigating Exploitation of th
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