CVE-2020-23776 Explained : Impact and Mitigation

A SSRF vulnerability exists in Winmail 6.5 in app.php in the key parameter when HTTPS is on. An attacker can exploit this vulnerability to manipulate the server into sending requests to a specific URL by modifying the 'HOST' request header value.

Understanding CVE-2020-23776

This CVE involves a Server-Side Request Forgery (SSRF) vulnerability in Winmail 6.5.

What is CVE-2020-23776?

CVE-2020-23776 is a security vulnerability in Winmail 6.5 that allows an attacker to trigger the server to send requests to a specified URL.

The Impact of CVE-2020-23776

The vulnerability enables attackers to manipulate the server to send requests to URLs of their choice, potentially leading to unauthorized access or data leakage.

Technical Details of CVE-2020-23776

This section provides more technical insights into the vulnerability.

Vulnerability Description

The SSRF vulnerability in Winmail 6.5 occurs in app.php in the key parameter when HTTPS is enabled, allowing attackers to control server requests.

Affected Systems and Versions

Affected Systems: Winmail 6.5
Affected Versions: Not specified

Exploitation Mechanism

Attackers can exploit this vulnerability by manipulating the 'HOST' request header value to direct the server to send requests to a specific URL.

Mitigation and Prevention

Protecting systems from CVE-2020-23776 requires immediate actions and long-term security practices.

Immediate Steps to Take

Disable unnecessary services that could be exploited by SSRF attacks.
Implement input validation to prevent malicious input.
Regularly monitor and analyze server logs for suspicious activities.

Long-Term Security Practices

Conduct regular security assessments and penetration testing to identify vulnerabilities.
Keep software and systems up to date with the latest security patches.

Patching and Updates

Ensure that Winmail 6.5 is updated with the latest patches and security fixes to mitigate the SSRF vulnerability.