CVE-2021-37705

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 the default configuration, which omits the `--multi_tenant_domain` option.

How to fix CVE-2021-37705

To remediate CVE-2021-37705, upgrade the affected package to a fixed version below.

• —upgrade to 2.31.0 or later
• —upgrade to 2fcb4998887959b4fa11894a068d689189742cb1 or later

Is CVE-2021-37705 being exploited?

Low — EPSS is 0.5%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• >= 2.12.0, < 2.31.0
• from 0, < 2fcb4998887959b4fa11894a068d689189742cb1 | >= 2.12.0, < 2.31.0

CVSS scores

References (9)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-37705
• PATCHpypi.org/project/onefuzz/
• WEBgithub.com/microsoft/onefuzz
• WEBgithub.com/microsoft/onefuzz/commit/2fcb4998887959b4fa11894a068d689189742cb1
• WEB