vulnerability / NVI-00017483 / Revision 1
Lemur has an authorization bypass in StrictRolePermission / AuthorityCreatorPermission
GitHub lists this reviewed advisory for lemur. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.
This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.
01 / Meaning
Why it matters
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8.8 high
GitHub source severity; exploitability and local consequence require separate evidence.
As of · GitHub Advisory Database
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
lemur
source listed<= 1.9.0
## Summary `StrictRolePermission` and `AuthorityCreatorPermission` in `lemur/auth/permissions.py` call `flask_principal.Permission.__init__()` with zero `Need`s when their config flags are unset. Both flags defaulted to `False` in code prior to the fix, so this was the state of any Lemur install that hadn't explicitly opted in. Flask-Principal's `Permission.allows()` returns `True` whenever `self.needs` is empty. The `.can()` gate therefore passes for every authenticated identity, including the lowest-privilege role Lemur ships (`read-only`). A user holding only `read-only` can create root Certificate Authorities, create and edit notifications (an SSRF sink), create domain entries, and upload arbitrary certificates. These classes are the sole authorization check on those endpoints. ## Root Cause ```python # lemur/auth/permissions.py class AuthorityCreatorPermission(Permission): def __init__(self): requires_admin = current_app.config.get("ADMIN_ONLY_AUTHORITY_CREATION", False) if requires_admin: super().__init__(RoleNeed("admin")) else: super().__init__() # empty Need set class StrictRolePermission(Permission):
03 / Response
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- investigate
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04 / Limits
What this report cannot establish
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05 / Provenance
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- GHSA-qcqw-jwxc-2hqg ↗
GitHub Advisory Database · vendor advisory
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Public revision history
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- Revision 1 ·
First indexed by Null; source disclosure date is shown separately.