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{Core} Validate endpoint origin to prevent access token leakage#33511

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necusjz:fix-endpoint-validation
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{Core} Validate endpoint origin to prevent access token leakage#33511
necusjz wants to merge 3 commits into
Azure:devfrom
necusjz:fix-endpoint-validation

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@necusjz

@necusjz necusjz commented Jun 9, 2026

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Description

Problem:
Azure CLI used str.startswith() to check whether a URL targets a trusted Azure endpoint before attaching an access token. A lookalike host like https://management.azure.com.attacker could match https://management.azure.com via prefix matching, causing the token to be sent to an attacker-controlled origin.

Fix:
Added is_same_origin(url, endpoint) in util.py that does exact origin comparison (scheme + host + port), handling default ports and userinfo (user@host) tricks. Applied it to:

  • send_raw_request (az rest) — replaces the startswith() checks.
  • AAZ pagination next_link — validates the URL against the ARM endpoint before reuse.

Tests:
Added coverage for is_same_origin, the az rest token-leak scenario, and the AAZ next_link validation, including lookalike-host and userinfo spoofing cases.

Testing Guide

History Notes

[Component Name 1] BREAKING CHANGE: az command a: Make some customer-facing breaking change
[Component Name 2] az command b: Add some customer-facing feature


This checklist is used to make sure that common guidelines for a pull request are followed.

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️✔️AzureCLI-BreakingChangeTest
️✔️Non Breaking Changes

@yonzhan

yonzhan commented Jun 9, 2026

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