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CVE-2016-10555

6.5 · MEDIUM

Since "algorithm" isn't enforced in jwt.decode()in jwt-simple 0.3.0 and earlier, a malicious user could choose what algorithm is sent sent to the server.

Published May 31, 2018CWE-20EPSS 4.78%

Overview

CVE-2016-10555 is a medium-severity vulnerability. It was published on May 31, 2018 and has a CVSS 3.0 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.0 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Since "algorithm" isn't enforced in jwt.decode()in jwt-simple 0.3.0 and earlier, a malicious user could choose what algorithm is sent sent to the server. If the server is expecting RSA but is sent HMAC-SHA with RSA's public key, the server will think the public key is actually an HMAC private key. This could be used to forge any data an attacker wants.

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

Refauth0.com/blog/2015/03/31/critical-vulnerabilities-in-json-web-token-libraries/GitHubgithub.com/hokaccha/node-jwt-simple/pull/14GitHubgithub.com/hokaccha/node-jwt-simple/pull/16Refnodesecurity.io/advisories/87Refauth0.com/blog/2015/03/31/critical-vulnerabilities-in-json-web-token-libraries/GitHubgithub.com/hokaccha/node-jwt-simple/pull/14GitHubgithub.com/hokaccha/node-jwt-simple/pull/16Refnodesecurity.io/advisories/87

How CyberStrike helps

Frequently asked questions

What is CVE-2016-10555?

CVE-2016-10555 is a medium-severity vulnerability. It was published on May 31, 2018 and has a CVSS 3.0 base score of 6.5 (MEDIUM).

How severe is CVE-2016-10555?

This vulnerability has a CVSS 3.0 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2016-10555?

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-2016-10555?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2016-10555 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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