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Vulnerability Intelligence
Miggo AI
Miggo AIMiggo AI
PythonPythonMiggo AIRoot Cause AnalysisThe vulnerability stemmed from Tornado's XSRF token generation being predictable and static across requests. The pre-3.2.2 implementation in xsrf_token() generated a fixed token (using os.urandom(16) only once per cookie lifetime) and sent it without masking. This allowed BREACH attackers to exploit HTTP compression patterns. The commit 1c36307 introduced masking with a random salt in xsrf_token(), and the test changes in web_test.py confirm the token uniqueness requirement. The CWE-203 (Observable Discrepancy) aligns with the predictable token pattern enabling side-channel attacks.
| Package Name | Ecosystem | Vulnerable Versions | First Patched Version |
|---|---|---|---|
| tornado | pip | < 3.2.2 | 3.2.2 |
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