CVE-2021-23339 : Exploit Details and Defense Strategies

A detailed overview of the CVE-2021-23339 vulnerability affecting com.typesafe.akka:akka-http-core.

Understanding CVE-2021-23339

This vulnerability, also known as HTTP Request Smuggling, impacts all versions before 10.1.14 and from 10.2.0 to 10.2.4 of com.typesafe.akka:akka-http-core package.

What is CVE-2021-23339?

CVE-2021-23339 is a security flaw in com.typesafe.akka:akka-http-core that allows the insertion of multiple Transfer-Encoding headers.

The Impact of CVE-2021-23339

With a CVSS base score of 5, this vulnerability has a medium severity level with high attack complexity. It requires user interaction and affects the confidentiality, integrity, and availability of systems.

Technical Details of CVE-2021-23339

A deeper look into the vulnerability.

Vulnerability Description

The vulnerability allows attackers to manipulate Transfer-Encoding headers, potentially leading to HTTP request smuggling attacks.

Affected Systems and Versions

All versions prior to 10.1.14 and versions ranging from 10.2.0 to 10.2.4 of com.typesafe.akka:akka-http-core are affected.

Exploitation Mechanism

The vulnerability can be exploited by inserting multiple Transfer-Encoding headers, enabling attackers to deceive the system.

Mitigation and Prevention

Best practices for addressing CVE-2021-23339.

Immediate Steps to Take

Update the affected package to version 10.1.14 or above to mitigate the vulnerability. Monitor for any unusual HTTP traffic patterns.

Long-Term Security Practices

Regularly update software components and dependencies to stay protected against emerging vulnerabilities. Conduct security assessments and tests periodically.

Patching and Updates

Stay informed about security advisories related to com.typesafe.akka:akka-http-core, and promptly apply patches released by the vendor.