CVE-2019-12525 : What You Need to Know
Learn about CVE-2019-12525 affecting Squid versions 3.3.9 through 3.5.28 and 4.x through 4.7. Understand the vulnerability, its impact, and mitigation steps to secure systems.
A vulnerability has been identified in versions 3.3.9 through 3.5.28 and 4.x through 4.7 of Squid, affecting systems using Digest authentication. The issue arises from a lack of validation in handling certain tokens, leading to a memcpy operation vulnerability.
Understanding CVE-2019-12525
This CVE pertains to a security flaw in Squid versions 3.3.9 through 3.5.28 and 4.x through 4.7, impacting systems configured with Digest authentication.
What is CVE-2019-12525?
Squid, when configured with Digest authentication, fails to properly validate certain tokens in the Proxy-Authorization header, potentially allowing malicious actors to exploit a memcpy operation vulnerability.
The Impact of CVE-2019-12525
The vulnerability in Squid could be exploited by attackers to execute arbitrary code or cause a denial of service (DoS) condition on affected systems.
Technical Details of CVE-2019-12525
This section provides detailed technical information about the vulnerability.
Vulnerability Description
When Squid is configured with Digest authentication, it mishandles the Proxy-Authorization header, specifically in the analysis of certain tokens. This mishandling leads to a memcpy operation vulnerability.
Affected Systems and Versions
- Versions 3.3.9 through 3.5.28 and 4.x through 4.7 of Squid
Exploitation Mechanism
The vulnerability arises from Squid's failure to properly validate the value of specific tokens in the Proxy-Authorization header, allowing for a memcpy operation vulnerability.
Mitigation and Prevention
Protecting systems from CVE-2019-12525 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Update Squid to a patched version that addresses the vulnerability
- Monitor for any unusual network activity that could indicate exploitation
Long-Term Security Practices
- Regularly update and patch software to mitigate known vulnerabilities
- Implement network segmentation to limit the impact of potential attacks
Patching and Updates
Ensure that Squid is regularly updated to the latest version to apply security patches and protect against known vulnerabilities.