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CVE-2021-37705

10.0 · CRITICAL

OneFuzz is an open source self-hosted Fuzzing-As-A-Service platform.

Published Aug 13, 2021CWE-285EPSS 2.42%

Overview

CVE-2021-37705 is a critical-severity vulnerability. It was published on August 13, 2021 and has a CVSS 3.1 base score of 10.0 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 10.0, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

OneFuzz is an open source self-hosted Fuzzing-As-A-Service platform. Starting with OneFuzz 2.12.0 or greater, an incomplete authorization check allows an authenticated user from any Azure Active Directory tenant to make authorized API calls to a vulnerable OneFuzz instance. To be vulnerable, a OneFuzz deployment must be both version 2.12.0 or greater and deployed with the non-default --multi_tenant_domain option. This can result in read/write access to private data such as software vulnerability and crash information, security testing tools and proprietary code and symbols. Via authorized API calls, this also enables tampering with existing data and unauthorized code execution on Azure compute resources. This issue is resolved starting in release 2.31.0, via the addition of application-level check of the bearer token's `issuer` against an administrator-configured allowlist. As a workaround users can restrict access to the tenant of a deployed OneFuzz instance < 2.31.0 by redeploying in

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/microsoft/onefuzz/commit/2fcb4998887959b4fa11894a068d689189742cb1GitHubgithub.com/microsoft/onefuzz/pull/1153GitHubgithub.com/microsoft/onefuzz/releases/tag/2.31.0GitHubgithub.com/microsoft/onefuzz/security/advisories/GHSA-q5vh-6whw-x745Refpypi.org/project/onefuzz/GitHubgithub.com/microsoft/onefuzz/commit/2fcb4998887959b4fa11894a068d689189742cb1GitHubgithub.com/microsoft/onefuzz/pull/1153GitHubgithub.com/microsoft/onefuzz/releases/tag/2.31.0GitHubgithub.com/microsoft/onefuzz/security/advisories/GHSA-q5vh-6whw-x745Refpypi.org/project/onefuzz/

How CyberStrike helps

Frequently asked questions

What is CVE-2021-37705?

CVE-2021-37705 is a critical-severity vulnerability. It was published on August 13, 2021 and has a CVSS 3.1 base score of 10.0 (CRITICAL).

How severe is CVE-2021-37705?

This vulnerability has a CVSS 3.1 base score of 10.0, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-37705?

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-2021-37705?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-37705 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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