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CVE-2018-20840

8.6 · HIGH

An unhandled exception vulnerability exists during Google Sign-In with Google API C++ Client before 2019-04-10.

Published May 30, 2019CWE-754EPSS 0.65%

Overview

CVE-2018-20840 is a high-severity vulnerability. It was published on May 30, 2019 and has a CVSS 3.0 base score of 8.6 (HIGH).

This vulnerability has a CVSS 3.0 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

An unhandled exception vulnerability exists during Google Sign-In with Google API C++ Client before 2019-04-10. It potentially causes an outage of third-party services that were not designed to recover from exceptions. On the client, ID token handling can cause an unhandled exception because of misinterpretation of an integer as a string, resulting in denial-of-service and then other users can no longer login/sign-in to the affected third-party service. Once this third-party service uses Google Sign-In with google-api-cpp-client, a malicious user can trigger this client/auth/oauth2_authorization.cc vulnerability by requesting the client to receive the ID token from a Google authentication server.

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/google/google-api-cpp-client/issues/57GitHubgithub.com/google/google-api-cpp-client/pull/58GitHubgithub.com/google/google-api-cpp-client/issues/57GitHubgithub.com/google/google-api-cpp-client/pull/58

How CyberStrike helps

Frequently asked questions

What is CVE-2018-20840?

CVE-2018-20840 is a high-severity vulnerability. It was published on May 30, 2019 and has a CVSS 3.0 base score of 8.6 (HIGH).

How severe is CVE-2018-20840?

This vulnerability has a CVSS 3.0 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2018-20840?

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-2018-20840?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-20840 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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