CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS
Percentile
80.7%
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:
--multi_tenant_domain
optionThis can result in read/write access to private data such as:
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.
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.
You can find an overview of the Microsoft Identity Platform here. This vulnerability applies to the multi-tenant application pattern, as described here.
If you have any questions or comments about this advisory:
github.com/advisories/GHSA-q5vh-6whw-x745
github.com/microsoft/onefuzz/commit/2fcb4998887959b4fa11894a068d689189742cb1
github.com/microsoft/onefuzz/pull/1153
github.com/microsoft/onefuzz/releases/tag/2.31.0
github.com/microsoft/onefuzz/security/advisories/GHSA-q5vh-6whw-x745
nvd.nist.gov/vuln/detail/CVE-2021-37705
pypi.org/project/onefuzz/
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS
Percentile
80.7%