CVE-2024-27093 is a medium-severity (CVSS 4.6) Improper Input Validation vulnerability in github.com/stacklok/minder. A fix is available for github.com/stacklok/minder — see the affected versions and patch details below.
Minder trusts client-provided mapping from repo name to upstream ID
Exploitation Status
Proof-of-concept exploit code exists
- CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
Exploitation and automatability from CISA’s SSVC triage for CVE-2024-27093.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
github.com/stacklok/minderReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
Description
Summary
When using a modified client or the grpc interface directly, the RegisterRepository call accepts both the repository owner / repo and the repo_id. Furthermore, these two are not checked for matching before registering webhooks and data in the database.
Details
It is possible for an attacker to register a repository with a invalid or differing upstream ID, which causes Minder to report the repository as registered, but not remediate any future changes which conflict with policy (because the webhooks for the repo do not match any known repository in the database). When attempting to register a repo with a different repo ID, the registered provider must have admin on the named repo, or a 404 error will result. Similarly, if the stored provider token does not have repo access, then the remediations will not apply successfully. Lastly, it appears that reconciliation actions do not execute against repos with this type of mismatch.
PoC
With an RPC like the following text proto:
context {
...
}
repository {
owner: "Stacklok-Demo-Org"
repo: "python-app"
# repo_id is defaulted to 0
}
I was able to produce the following minder output:
+--------------------------------------+--------------------------------------+----------+-------------+-------------------+------------+
| ID | PROJECT | PROVIDER | UPSTREAM ID | OWNER | NAME |
+--------------------------------------+--------------------------------------+----------+-------------+-------------------+------------+
| da3acba4-ef66-4d9b-b41e-250869107fd5 | f9f4aef0-74af-4909-a0c3-0e8ac7fbc38d | github | 0 | Stacklok-Demo-Org | python-app |
+--------------------------------------+--------------------------------------+----------+-------------+-------------------+------------+
| 7cf8f7b8-b19b-40dd-a96b-b88bb1ef5563 | f9f4aef0-74af-4909-a0c3-0e8ac7fbc38d | github | 762029128 | evankanderson | bad-python |
+--------------------------------------+--------------------------------------+----------+-------------+-------------------+------------+
$ gh api repos/Stacklok-Demo-Org/python-app | jq .id
762029128
I've registered bad-python with the ID of python-app, and python-app with an ID of 0.
Impact
This appears to primarily be a potential denial-of-service vulnerability.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | github.com/stacklok/minder | all versions | 0.20240226.1425go get github.com/stacklok/minder@v0.20240226.1425 |
Affected Products
minderlfprojectsDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/stacklok/minder, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/stacklok/minder to 0.20240226.1425 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2024-27093 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
Frequently Asked Questions
Is CVE-2024-27093 in your dependencies?
Find it across Go, including transitive dependencies.