CVE-2019-18678 : Security Advisory and Response

A vulnerability was found in versions 3.x and 4.x of Squid up to version 4.8, allowing attackers to transport HTTP requests through frontend software to a Squid setup, resulting in corrupted caches with attacker-controlled content.

Understanding CVE-2019-18678

This CVE pertains to a vulnerability in Squid versions 3.x and 4.x up to version 4.8 that enables attackers to manipulate HTTP requests, potentially leading to cache corruption.

What is CVE-2019-18678?

An issue in Squid versions 3.x and 4.x up to 4.8 allows attackers to smuggle HTTP requests through frontend software to a Squid instance, corrupting caches with attacker-controlled content.

The Impact of CVE-2019-18678

Limited to software between the attacking client and Squid
Does not affect Squid itself or upstream servers
Caused by whitespace in a request header

Technical Details of CVE-2019-18678

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability enables attackers to transport HTTP requests through frontend software to a Squid setup, corrupting caches with attacker-controlled content.

Affected Systems and Versions

Versions 3.x and 4.x of Squid up to version 4.8

Exploitation Mechanism

Attackers exploit the vulnerability by manipulating HTTP requests through frontend software, leading to cache corruption.

Mitigation and Prevention

Protective measures to address CVE-2019-18678.

Immediate Steps to Take

Apply security patches promptly
Monitor and restrict traffic to vulnerable systems
Implement network segmentation to contain potential attacks

Long-Term Security Practices

Regularly update and patch software
Conduct security audits and penetration testing
Educate users on safe browsing practices

Patching and Updates

Update Squid to the latest patched version
Follow vendor advisories for security updates