CVE-2021-20289 : Exploit Details and Defense Strategies

A flaw was discovered in RESTEasy in all versions up to 4.6.0.Final, where the endpoint class and method names are exposed in the exception response. This could lead to a data confidentiality breach.

Understanding CVE-2021-20289

This CVE highlights a vulnerability in RESTEasy versions up to 4.6.0.Final that exposes sensitive information in exception responses.

What is CVE-2021-20289?

The vulnerability in RESTEasy allows endpoint class and method names exposure in exception responses, potentially compromising data confidentiality.

The Impact of CVE-2021-20289

The primary threat posed by this CVE is to data confidentiality due to the inadvertent exposure of sensitive information.

Technical Details of CVE-2021-20289

This section delves into the specific technical aspects of the CVE.

Vulnerability Description

In versions up to 4.6.0.Final of RESTEasy, when the framework cannot convert certain request values, it inadvertently reveals the endpoint class and method names in the exception response.

Affected Systems and Versions

RESTEasy versions affected include 3.11.5.Final, 3.15.2.Final, 4.5.10.Final, 4.6.1.Final, and 4.6.2.Final.

Exploitation Mechanism

Exploiting this vulnerability involves crafting requests that trigger the conversion failure, leading to the exposure of sensitive endpoint information.

Mitigation and Prevention

Addressing and safeguarding systems against the CVE is crucial to maintain data confidentiality.

Immediate Steps to Take

Organizations should update RESTEasy to version 4.6.1.Final or later to mitigate the vulnerability and protect sensitive data.

Long-Term Security Practices

Implementing sound security practices and regular vulnerability assessments can help prevent similar data exposure vulnerabilities.

Patching and Updates

Regularly applying security patches and staying informed about software updates are vital to ensuring system security.