CVE-2021-37705
What it is
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.
At a glance
- Exploitability
- Can be exploited over the network without logging in. High risk of data exposure, data tampering.
- Exploit odds
- 2.4% chance of exploitation in the next 30 days (EPSS).
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 2.4% in the next 30 days (EPSS).
- Severity: 10.0 CRITICAL (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Exploit probability
- 2.4% · EPSS, next 30 days
- Weakness
- CWE-285
- Record status
- Modified
Affected
- Microsoft Onefuzz < 2.31.0
Attack profile CVSS 3.1 · 10.0
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- Low
Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2021-37705.md and follow it. Check whether this project is affected by CVE-2021-37705. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
Fix and advisories
- https://github.com/microsoft/onefuzz/commit/2fcb4998887959b4fa11894a068d689189742cb1
- https://github.com/microsoft/onefuzz/pull/1153
- https://github.com/microsoft/onefuzz/releases/tag/2.31.0
- https://github.com/microsoft/onefuzz/security/advisories/GHSA-q5vh-6whw-x745
- https://github.com/microsoft/onefuzz/commit/2fcb4998887959b4fa11894a068d689189742cb1
- https://github.com/microsoft/onefuzz/pull/1153
- https://github.com/microsoft/onefuzz/releases/tag/2.31.0
- https://github.com/microsoft/onefuzz/security/advisories/GHSA-q5vh-6whw-x745
References
- https://github.com/microsoft/onefuzz/commit/2fcb4998887959b4fa11894a068d689189742cb1
- https://github.com/microsoft/onefuzz/pull/1153
- https://github.com/microsoft/onefuzz/releases/tag/2.31.0
- https://github.com/microsoft/onefuzz/security/advisories/GHSA-q5vh-6whw-x745
- https://pypi.org/project/onefuzz/
- https://github.com/microsoft/onefuzz/commit/2fcb4998887959b4fa11894a068d689189742cb1
- https://github.com/microsoft/onefuzz/pull/1153
- https://github.com/microsoft/onefuzz/releases/tag/2.31.0
- https://github.com/microsoft/onefuzz/security/advisories/GHSA-q5vh-6whw-x745
- https://pypi.org/project/onefuzz/