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Tornado has an HTTP cookie parsing DoS vulnerability

High severity GitHub Reviewed Published Nov 22, 2024 in tornadoweb/tornado • Updated Nov 22, 2024

Package

pip tornado (pip)

Affected versions

<= 6.4.1

Patched versions

6.4.2

Description

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.

See also CVE-2024-7592 for a similar vulnerability in cpython.

References

@bdarnell bdarnell published to tornadoweb/tornado Nov 22, 2024
Published by the National Vulnerability Database Nov 22, 2024
Published to the GitHub Advisory Database Nov 22, 2024
Reviewed Nov 22, 2024
Last updated Nov 22, 2024

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS score

0.045%
(18th percentile)

Weaknesses

CVE ID

CVE-2024-52804

GHSA ID

GHSA-8w49-h785-mj3c

Source code

Credits

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