CVE-2020-11945 : What You Need to Know
Discover the impact of CVE-2020-11945 in Squid before 5.0.2, enabling attackers to exploit Digest Authentication nonce for unauthorized access. Learn mitigation steps and prevention measures.
An issue was discovered in Squid before 5.0.2 where a remote attacker can exploit Digest Authentication nonce to gain unauthorized access.
Understanding CVE-2020-11945
This CVE involves a vulnerability in Squid that allows attackers to manipulate Digest Authentication nonce, potentially leading to unauthorized access to restricted resources.
What is CVE-2020-11945?
The vulnerability in Squid before version 5.0.2 enables a remote attacker to replay a captured Digest Authentication nonce, potentially bypassing access restrictions.
The Impact of CVE-2020-11945
The exploitation of this vulnerability can result in unauthorized access to resources that are typically restricted, posing a risk of sensitive data exposure or unauthorized actions within the affected system.
Technical Details of CVE-2020-11945
This section provides more in-depth technical insights into the CVE-2020-11945 vulnerability.
Vulnerability Description
The issue arises from an attacker's ability to overflow the nonce reference counter, allowing them to replay captured credentials and potentially execute remote code.
Affected Systems and Versions
- Product: Squid
- Vendor: N/A
- Versions affected: All versions before 5.0.2
Exploitation Mechanism
- Attackers can replay captured Digest Authentication nonce
- Overflow the nonce reference counter
- Potential remote code execution if token credentials are improperly handled
Mitigation and Prevention
Protect your systems from CVE-2020-11945 with these mitigation strategies.
Immediate Steps to Take
- Update Squid to version 5.0.2 or later
- Monitor network traffic for any suspicious activity
- Implement strong access controls and authentication mechanisms
Long-Term Security Practices
- Regularly update and patch software to mitigate known vulnerabilities
- Conduct security assessments and penetration testing to identify and address weaknesses
Patching and Updates
- Apply patches provided by Squid to address the vulnerability
- Stay informed about security advisories and updates from relevant vendors