CVE-2018-0353 : Security Advisory and Response

A vulnerability in traffic-monitoring functions in Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to circumvent security protections.

Understanding CVE-2018-0353

A flaw in Cisco Web Security Appliance (WSA) allows attackers to bypass security measures and circumvent Layer 4 Traffic Monitor (L4TM).

What is CVE-2018-0353?

The vulnerability in Cisco WSA enables remote attackers to manipulate IP packets, allowing unauthorized traffic to pass through the device.

The Impact of CVE-2018-0353

Attackers can bypass security protections without authentication
Circumvent Layer 4 Traffic Monitor (L4TM) functionality
Manipulate IP packets to exploit the vulnerability
Allow unauthorized traffic to pass through the device
Affects both IPv4 and IPv6 traffic

Technical Details of CVE-2018-0353

A detailed look at the technical aspects of the vulnerability.

Vulnerability Description

Caused by a modification in the underlying operating system software
Allows attackers to bypass security protections

Affected Systems and Versions

Cisco AsyncOS versions for WSA on virtual and hardware appliances
Versions 10.5.1, 10.5.2, and 11.0.0 of WSA Software

Exploitation Mechanism

Attackers send manipulated IP packets to exploit the vulnerability
Successful exploitation allows unauthorized traffic to pass through

Mitigation and Prevention

Steps to mitigate the CVE-2018-0353 vulnerability.

Immediate Steps to Take

Apply patches provided by Cisco
Disable L4TM if not required
Monitor network traffic for any suspicious activity

Long-Term Security Practices

Regularly update and patch Cisco WSA software
Implement network segmentation to limit the impact of potential breaches

Patching and Updates

Stay informed about security advisories from Cisco
Apply security updates promptly to mitigate risks