CVE-2019-9741 Explained : Impact and Mitigation
Learn about CVE-2019-9741, a vulnerability in Go 1.11.5 that enables CRLF injection if an attacker controls a URL parameter. Find out the impact, affected systems, exploitation mechanism, and mitigation steps.
In Go 1.11.5, a vulnerability was found in net/http where CRLF injection can occur if a URL parameter is controlled by an attacker. This can lead to potential security risks.
Understanding CVE-2019-9741
What is CVE-2019-9741?
An issue discovered in net/http in Go 1.11.5 allows for CRLF injection if an attacker controls a URL parameter, demonstrated by specific arguments in http.NewRequest.
The Impact of CVE-2019-9741
This vulnerability could be exploited by attackers to inject malicious content into HTTP headers or Redis commands, potentially leading to various attacks.
Technical Details of CVE-2019-9741
Vulnerability Description
The vulnerability in Go 1.11.5 allows for CRLF injection if a malicious actor controls a URL parameter, as shown by specific arguments in http.NewRequest.
Affected Systems and Versions
- Product: Not applicable
- Vendor: Not applicable
- Versions affected: Not applicable
Exploitation Mechanism
The vulnerability can be exploited by manipulating the second argument of http.NewRequest to include \r\n followed by an HTTP header or a Redis command.
Mitigation and Prevention
Immediate Steps to Take
- Update to a patched version of Go to mitigate the vulnerability.
- Avoid passing user-controlled data directly into HTTP headers or Redis commands.
Long-Term Security Practices
- Regularly update software and libraries to address known vulnerabilities.
- Implement input validation to prevent malicious input from reaching sensitive functions.
Patching and Updates
Ensure that all systems running Go are updated to a version that includes the patch for CVE-2019-9741.