CVE-2019-18679 : Exploit Details and Defense Strategies

A vulnerability has been found in Squid versions 2.x, 3.x, and 4.x up to 4.8, allowing the disclosure of sensitive information during HTTP Digest Authentication processing.

Understanding CVE-2019-18679

This CVE involves mishandling data in Squid versions, potentially weakening ASLR protections and aiding attackers in remote code execution.

What is CVE-2019-18679?

An issue in Squid versions 2.x, 3.x, and 4.x up to 4.8 leads to information disclosure during HTTP Digest Authentication processing. Attackers can exploit this to identify memory areas for remote code execution.

The Impact of CVE-2019-18679

Exploiting this vulnerability can weaken ASLR protections, making it easier for attackers to pinpoint specific memory areas for remote code execution attacks.

Technical Details of CVE-2019-18679

Squid versions 2.x, 3.x, and 4.x up to 4.8 are affected by this vulnerability.

Vulnerability Description

The issue arises from mishandling data during HTTP Digest Authentication, where nonce tokens contain raw byte values of pointers within heap memory, potentially aiding attackers in identifying memory areas for attacks.

Affected Systems and Versions

Squid versions 2.x, 3.x, and 4.x up to 4.8

Exploitation Mechanism

Attackers can exploit this vulnerability to weaken ASLR protections and identify specific memory areas for remote code execution attacks.

Mitigation and Prevention

To address CVE-2019-18679, consider the following steps:

Immediate Steps to Take

Update Squid to a patched version that addresses the vulnerability.
Monitor network traffic for any suspicious activity.
Implement strong authentication mechanisms.

Long-Term Security Practices

Regularly update and patch software to prevent vulnerabilities.
Conduct security audits and penetration testing to identify and address weaknesses.

Patching and Updates

Apply patches provided by Squid to fix the vulnerability and enhance security.