CVE-2019-18677 : Vulnerability Insights and Analysis
Discover the impact of CVE-2019-18677 in Squid versions 3.x and 4.x up to 4.8. Learn about the vulnerability, affected systems, exploitation, and mitigation steps.
A problem has been found in Squid versions 3.x and 4.x up to 4.8 where the append_domain setting can lead to improper handling of messages, potentially redirecting traffic to unintended destinations.
Understanding CVE-2019-18677
What is CVE-2019-18677?
An issue in Squid 3.x and 4.x versions up to 4.8 occurs when the append_domain setting is used, causing appended characters to violate hostname length restrictions. This can result in incorrect message processing and redirection of traffic.
The Impact of CVE-2019-18677
Improper handling of messages due to the append_domain setting in Squid versions 3.x and 4.x up to 4.8 can lead to traffic being redirected to destinations where it should not be sent.
Technical Details of CVE-2019-18677
Vulnerability Description
The vulnerability arises from the improper interaction of appended characters with hostname length restrictions, causing incorrect message processing.
Affected Systems and Versions
- Squid versions 3.x and 4.x up to 4.8
Exploitation Mechanism
The issue occurs when the append_domain setting is utilized, leading to the redirection of traffic to unintended destinations.
Mitigation and Prevention
Immediate Steps to Take
- Apply the latest security updates provided by Squid to patch the vulnerability.
- Disable the append_domain setting if not essential for operations.
Long-Term Security Practices
- Regularly monitor for security advisories and updates from Squid.
- Implement network segmentation to limit the impact of potential attacks.
Patching and Updates
- Update Squid to versions that contain fixes for CVE-2019-18677.