CVE-2024-52804: tornado DoS — Fix

Description

Tornado is a Python web framework and asynchronous networking library. The algorithm used for parsing HTTP cookies in Tornado versions prior to 6.4.2 sometimes has quadratic complexity, leading to excessive CPU consumption when parsing maliciously-crafted cookie headers. This parsing occurs in the event loop thread and may block the processing of other requests. Version 6.4.2 fixes the issue.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

CWE-770 CWE-770

Affected Products

Vendor	Product	Versions
tornadoweb	tornado	< 6.4.2

References

Advisories & Patches

https://github.com/tornadoweb/tornado/commit/d5ba4a1695fbf7c6a3e54313262639b198291533

Other References

https://github.com/advisories/GHSA-7pwv-g7hj-39pr https://github.com/tornadoweb/tornado/security/advisories/GHSA-8w49-h785-mj3c https://lists.debian.org/debian-lts-announce/2025/01/msg00000.html

Frequently Asked Questions

What is CVE-2024-52804? +

Tornado is a Python web framework and asynchronous networking library. The algorithm used for parsing HTTP cookies in Tornado versions prior to 6.4.2 sometimes has quadratic complexity, leading to excessive CPU consumption when parsing maliciously-crafted cookie headers. This parsing occurs in the event loop thread and may block the processing of other requests. Version 6.4.2 fixes the issue. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2024-52804? +

CVE-2024-52804 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2024-52804? +

CVE-2024-52804 affects products from tornadoweb, specifically: tornado. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-52804? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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