CVE-2021-43185 : What You Need to Know

JetBrains YouTrack before 2021.3.23639 is vulnerable to Host header injection.

Understanding CVE-2021-43185

JetBrains YouTrack before 2021.3.23639 is susceptible to a security issue related to Host header injection.

What is CVE-2021-43185?

CVE-2021-43185 is a vulnerability in JetBrains YouTrack that allows an attacker to inject malicious content into the Host header.

The Impact of CVE-2021-43185

Attackers can exploit this vulnerability to perform various malicious activities, such as server-side request forgery (SSRF).
This could lead to unauthorized access to sensitive data or services within the affected system.

Technical Details of CVE-2021-43185

JetBrains YouTrack before version 2021.3.23639 is affected by the following:

Vulnerability Description

Host header injection vulnerability in JetBrains YouTrack.

Affected Systems and Versions

Product: JetBrains YouTrack
Version: Before 2021.3.23639

Exploitation Mechanism

An attacker can manipulate the Host header to trick the server into processing requests differently, potentially leading to SSRF.

Mitigation and Prevention

It is crucial to take immediate actions to mitigate the risks associated with CVE-2021-43185.

Immediate Steps to Take

Upgrade JetBrains YouTrack to version 2021.3.23639 or later to address the vulnerability.
Regularly monitor for any unusual activities on the network that might indicate exploitation attempts.

Long-Term Security Practices

Implement strict input validation to prevent unauthorized characters in HTTP headers.
Educate developers and system administrators on secure coding practices to reduce the likelihood of similar vulnerabilities.
Keep systems and software up to date to patch known security issues.