CVE-2021-37705 Improper Authorization and Origin Validation Error in OneFuzz

2021-08-1320:15:11

CWE-285

CWE-346

GitHub_M

www.cve.org

onefuzz

authorization

origin validation

azure active directory

api calls

vulnerability

security testing

data access

code execution

workaround

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

LOW

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L

AI Score

9.6

Confidence

High

EPSS

0.007

Percentile

80.7%

JSON

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.

CNA Affected

[
  {
    "product": "onefuzz",
    "vendor": "microsoft",
    "versions": [
      {
        "status": "affected",
        "version": ">= 2.12.0, < 2.31.0"
      }
    ]
  }
]