CVE-2017-6607 : Vulnerability Insights and Analysis
Learn about CVE-2017-6607, a vulnerability in Cisco ASA Software's DNS code that allows attackers to cause device reload or DNS cache corruption. Find out affected systems, versions, and mitigation steps.
Cisco ASA Software DNS Vulnerability
Understanding CVE-2017-6607
What is CVE-2017-6607?
A vulnerability in the DNS code of Cisco ASA Software allows an attacker to trigger a device reload or corrupt local DNS cache by exploiting crafted DNS response messages.
The Impact of CVE-2017-6607
This vulnerability could lead to denial of service conditions or data corruption on affected devices running Cisco ASA Software.
Technical Details of CVE-2017-6607
Vulnerability Description
- Flaw in handling crafted DNS response messages
- Attacker triggers DNS request and responds with a crafted message
- Can cause device reload or DNS cache corruption
Affected Systems and Versions
- Cisco ASA Software in routed or transparent firewall mode
- Impacts various Cisco ASA products
- Versions affected: 9.1(7.12), 9.2(4.18), 9.4(3.12), 9.5(3.2), 9.6(2.2)
Exploitation Mechanism
- Attacker sends crafted DNS response to trigger reload or corruption
- Only traffic directed at the affected device can exploit this vulnerability
Mitigation and Prevention
Immediate Steps to Take
- Upgrade affected Cisco ASA Software to fixed versions
Long-Term Security Practices
- Regularly update and patch Cisco ASA Software
- Implement network segmentation and access controls
- Monitor DNS traffic for anomalies
- Stay informed about security advisories and patches