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fix(security): add Azure metadata endpoint to SSRF blocklist

Browse Source 
Add metadata.azure.internal to BLOCKED_METADATA_HOSTS alongside the
existing AWS/GCP endpoints. Closes the coverage gap identified in #125.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Garry Tan
2026-03-22 09:57:22 -07:00
parent 24b7e11050
commit faaf998c7b
2 changed files with 5 additions and 0 deletions
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browse/src/url-validation.ts
+1
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@@ -7,6 +7,7 @@ const BLOCKED_METADATA_HOSTS = new Set([
'169.254.169.254', // AWS/GCP/Azure instance metadata '169.254.169.254', // AWS/GCP/Azure instance metadata
'fd00::', // IPv6 unique local (metadata in some cloud setups) 'fd00::', // IPv6 unique local (metadata in some cloud setups)
'metadata.google.internal', // GCP metadata 'metadata.google.internal', // GCP metadata
'metadata.azure.internal', // Azure IMDS
]); ]);
/** /**
browse/test/url-validation.test.ts
+4
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@@ -42,6 +42,10 @@ describe('validateNavigationUrl', () => {
expect(() => validateNavigationUrl('http://metadata.google.internal/computeMetadata/v1/')).toThrow(/cloud metadata/i); expect(() => validateNavigationUrl('http://metadata.google.internal/computeMetadata/v1/')).toThrow(/cloud metadata/i);
}); });
it('blocks Azure metadata hostname', () => {
expect(() => validateNavigationUrl('http://metadata.azure.internal/metadata/instance')).toThrow(/cloud metadata/i);
});
it('blocks metadata hostname with trailing dot', () => { it('blocks metadata hostname with trailing dot', () => {
expect(() => validateNavigationUrl('http://metadata.google.internal./computeMetadata/v1/')).toThrow(/cloud metadata/i); expect(() => validateNavigationUrl('http://metadata.google.internal./computeMetadata/v1/')).toThrow(/cloud metadata/i);
}); });