How to use Devin to propose a proxy auth-chain fix
Devin reproduced a planted proxy-authentication chain in a sandbox and proposed a tested secret-gated patch, with human review and no deployed-fix claim.
github.com
Suggested prompt
Suggested prompt written by Agents In Use, not the source author. Replace bracketed inputs and review tool permissions first.
Scan this deliberately vulnerable local API for authentication chains across files. Start and seed it in a sandbox, reproduce unauthorized identity-header access with curl, and let me review the finding. Propose a fail-closed trusted-proxy guard, negative tests, and deployment header-stripping requirements without merging the patch.
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Sourced account- Source author
- Nader Dabit (@dabit3)
- Original account
- Read the source ↗
- Published
- Source link checked
- Reported result
- Devin reproduced a lab authentication chain and proposed a proxy-secret guard with seven reported passing tests; the target patch was closed unmerged.
- Human involvement
- The tutorial shows human review of the scan model and assignment of a fix session. The target repository owner retained acceptance control and closed the patch without merging.
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How the agent did it
- The human reviewed Devin’s application model for a lab repository with deliberately planted vulnerabilities.
- Devin reproduced the header-authentication chain through sandbox setup and local requests.
- A fix session proposed proxy-secret gating, negative authentication tests, and deployment instructions in a linked PR.
Nader Dabit’s Devin Security Swarm tutorial records a scan of Orbit API Demo, a deliberately vulnerable application. The setup contained an object-access bug, an attachment traversal issue, and a two-file authentication chain: one component trusted a client-supplied user header, while another trusted the resulting role.
The human reviewed the generated application model before continuing. Devin validated findings in a sandbox by starting the service, seeding data, logging in, and making local HTTP requests. A confirmed header-authentication finding was then assigned to a separate Devin fix session, which produced a linked pull request.
That proposal required a shared proxy secret before honoring X-Forwarded-User. With no configured secret, the header route was disabled and Bearer tokens remained the authentication path. Tests covered a missing secret, an incorrect secret, and the expected trusted-proxy request. The deployment notes also required the proxy to strip client-supplied identity headers.
The tutorial was merged, but the linked application repair was later closed without merging. The demonstrated result is therefore a reproduced lab finding and a tested patch proposal. It is not evidence of a production incident, assigned CVE, or deployed remediation.
Prompt
Suggested prompt (written by Agents In Use, not the author's)
Source: GitHub · Nader Dabit (@dabit3)
Frequently asked questions
Was this a production vulnerability discovery?
No. Orbit API Demo deliberately contained planted bugs.
What did the proposed fix trust?
The identity header required a configured proxy secret; absent configuration disabled that route.
Was the application patch merged?
No. The tutorial merged, but the linked fix PR was closed unmerged.
More details
About this account
The human reviewed Devin’s application model for a lab repository with deliberately planted vulnerabilities. Devin reproduced the header-authentication chain through sandbox setup and local requests.
Opened tutorial PR and linked thequantexplorer/orbit-api-demo PR1. Synthetic target, not a production CVE. Tutorial author identity is confirmed by public coauthor metadata; patch status is closed unmerged. Suggested prompt written by Agents In Use; no original task prompt was published in the verified account.
Credit: Nader Dabit (@dabit3) — GitHub
Source published
Added to Agents In Use
Source checked
Tools and topics
Devin Security Swarm · Node.js · curl · GitHub
authentication · sandbox validation · security review
Editorial completeness: 100/100. Measures documented fields, not agent performance or verified outcomes.