CVE-2019-1884 : Exploit Details and Defense Strategies
Learn about CVE-2019-1884, a vulnerability in Cisco Web Security Appliance allowing DoS attacks. Find out affected versions, impact, and mitigation steps.
Cisco Web Security Appliance Web Proxy Denial of Service Vulnerability
Understanding CVE-2019-1884
This CVE involves a weakness in the web proxy feature of Cisco AsyncOS Software for Cisco Web Security Appliance (WSA) that could be exploited by an authorized attacker, potentially leading to a denial of service (DoS) situation.
What is CVE-2019-1884?
The vulnerability arises from insufficient validation of certain fields in HTTP/HTTPS requests transmitted through the affected device, allowing an attacker to disrupt traffic processing capabilities by sending a corrupt request.
The Impact of CVE-2019-1884
The vulnerability has a CVSS base score of 7.7 (High severity) with a high impact on availability. Successful exploitation could result in a DoS condition on the affected device.
Technical Details of CVE-2019-1884
Vulnerability Description
- Weakness in the web proxy feature of Cisco AsyncOS Software for Cisco WSA
- Insufficient validation of certain fields in HTTP/HTTPS requests
Affected Systems and Versions
- Product: Cisco Web Security Appliance (WSA)
- Vendor: Cisco
- Versions Affected: < 10.5.5-005
Exploitation Mechanism
- Attacker sends a corrupt HTTP/HTTPS request through the affected device
- Successful exploitation disrupts traffic processing capabilities, causing a DoS condition
Mitigation and Prevention
Immediate Steps to Take
- Apply vendor-provided patches or updates promptly
- Monitor network traffic for any suspicious activity
Long-Term Security Practices
- Regularly update and patch all software and systems
- Implement network segmentation and access controls
Patching and Updates
- Refer to the vendor's security advisory for specific patch details and instructions