CVE-2020-27218 : Security Advisory and Response
Learn about CVE-2020-27218 affecting Eclipse Jetty versions 9.4.0.RC0 to 9.4.34.v20201102, 10.0.0.alpha0 to 10.0.0.beta2, and 11.0.0.alpha0 to 11.0.0.beta2. Find out the impact, technical details, affected systems, exploitation mechanism, and mitigation steps.
Eclipse Jetty versions 9.4.0.RC0 to 9.4.34.v20201102, 10.0.0.alpha0 to 10.0.0.beta2, and 11.0.0.alpha0 to 11.0.0.beta2 are affected by a vulnerability that allows an attacker to inject data into subsequent requests.
Understanding CVE-2020-27218
This CVE affects Eclipse Jetty versions 9.4.0.RC0 to 9.4.34.v20201102, 10.0.0.alpha0 to 10.0.0.beta2, and 11.0.0.alpha0 to 11.0.0.beta2.
What is CVE-2020-27218?
If GZIP request body inflation is enabled and requests from different clients are multiplexed onto a single connection, an attacker can inject data into subsequent requests.
The Impact of CVE-2020-27218
- Allows an attacker to prepend data to subsequent requests on the same connection
- Injection of data into the body of subsequent requests
Technical Details of CVE-2020-27218
Eclipse Jetty is affected by a vulnerability that enables data injection into subsequent requests.
Vulnerability Description
- Attacker can prepend data to subsequent requests
- Injection of data into subsequent request bodies
Affected Systems and Versions
- Vendor: The Eclipse Foundation
- Product: Eclipse Jetty
- Affected Versions: 9.4.0.RC0 to 9.4.34.v20201102, 10.0.0.alpha0 to 10.0.0.beta2, 11.0.0.alpha0 to 11.0.0.beta2
Exploitation Mechanism
- Enable GZIP request body inflation
- Multiplex requests from different clients onto a single connection
- Attacker sends a request with a body that is received but not consumed
- Subsequent request on the same connection will have the attacker's data prepended
Mitigation and Prevention
To address CVE-2020-27218, follow these steps:
Immediate Steps to Take
- Disable GZIP request body inflation if not essential
- Implement strict request handling to prevent data injection
Long-Term Security Practices
- Regularly update Eclipse Jetty to patched versions
- Monitor and analyze network traffic for unusual patterns
Patching and Updates
- Apply the security update provided by Eclipse Jetty
- Stay informed about security alerts and updates from Eclipse and other relevant sources