🛡️ Sentinel: [HIGH] Fix authentication bypass via deceptive loopback hostnames#140
🛡️ Sentinel: [HIGH] Fix authentication bypass via deceptive loopback hostnames#140Dexploarer wants to merge 1 commit intodevelopfrom
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| it("generates a token for non-loopback binds starting with 127.", () => { | ||
| delete process.env.MILADY_API_TOKEN; | ||
| const warnSpy = vi.spyOn(logger, "warn").mockImplementation(() => {}); | ||
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| ensureApiTokenForBindHost("127.example.com"); | ||
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| const generated = process.env.MILADY_API_TOKEN ?? ""; | ||
| expect(generated).toMatch(/^[a-f0-9]{64}$/); | ||
| }); |
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Inconsistent logging assertion:
The test case for '127.example.com' (lines 49-57) verifies token generation but does not assert that the generated token is not logged, unlike the previous test for '0.0.0.0:2138'. This results in inconsistent coverage regarding the logging of sensitive information.
Recommendation:
Add an assertion similar to the previous test to ensure that the generated token is not present in any logger.warn messages:
const loggedMessages = warnSpy.mock.calls
.map((call) => call[0])
.map((value) => String(value));
expect(loggedMessages.some((message) => message.includes(generated))).toBe(false);
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Summary of ChangesHello @Dexploarer, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request addresses a high-severity authentication bypass vulnerability by enhancing the validation logic for loopback bind hosts. The change ensures that only legitimate loopback IPv4 addresses are recognized as such, preventing malicious hostnames from bypassing API token generation and potentially exposing the API. A new regression test confirms the fix, and detailed documentation of the vulnerability has been added. Highlights
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Code Review
This pull request correctly fixes an authentication bypass vulnerability by adding a strict IP address check in isLoopbackBindHost. The added regression test effectively verifies the fix. I've also suggested a refactoring to reduce code duplication and improve maintainability by using an existing helper function.
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🚨 Severity: HIGH
💡 Vulnerability: isLoopbackBindHost used string prefix matching ("127.") to identify loopback addresses, allowing hostnames like 127.example.com to bypass automatic API token generation.
🎯 Impact: An attacker could trick a user into binding to a public-resolving hostname that starts with "127.", exposing the API without authentication.
🔧 Fix: Updated isLoopbackBindHost to strictly validate that the input is a valid IPv4 address using net.isIP before checking the "127." prefix.
✅ Verification: Added a regression test in src/api/server.api-token-bind.test.ts asserting that 127.example.com triggers token generation.
PR created automatically by Jules for task 12356812126411277806 started by @Dexploarer