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CVE-2021-29485

9.9 · CRITICAL

Ratpack is a toolkit for creating web applications.

Published Jun 29, 2021CWE-502EPSS 1.99%

Overview

CVE-2021-29485 is a critical-severity vulnerability. It was published on June 29, 2021 and has a CVSS 3.1 base score of 9.9 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.9, rated CRITICAL. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Ratpack is a toolkit for creating web applications. In versions prior to 1.9.0, a malicious attacker can achieve Remote Code Execution (RCE) via a maliciously crafted Java deserialization gadget chain leveraged against the Ratpack session store. If one's application does not use Ratpack's session mechanism, it is not vulnerable. Ratpack 1.9.0 introduces a strict allow-list mechanism that mitigates this vulnerability when used. Two possible workarounds exist. The simplest mitigation for users of earlier versions is to reduce the likelihood of attackers being able to write to the session data store. Alternatively or additionally, the allow-list mechanism could be manually back ported by providing an alternative implementation of `SessionSerializer` that uses an allow-list.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/ratpack/ratpack/security/advisories/GHSA-hc33-32vw-rpp9Refmvnrepository.com/artifact/io.ratpack/ratpack-coreGitHubgithub.com/ratpack/ratpack/security/advisories/GHSA-hc33-32vw-rpp9Refmvnrepository.com/artifact/io.ratpack/ratpack-core

How CyberStrike helps

Frequently asked questions

What is CVE-2021-29485?

CVE-2021-29485 is a critical-severity vulnerability. It was published on June 29, 2021 and has a CVSS 3.1 base score of 9.9 (CRITICAL).

How severe is CVE-2021-29485?

This vulnerability has a CVSS 3.1 base score of 9.9, rated CRITICAL. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-29485?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-29485?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-29485 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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