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CVE-2024-45412: Potential Denial of Service due to the One Milion Unicode characters attack

Moderate
tomchop published GHSA-cwwm-pq9x-2cxv Sep 10, 2024

Package

yeti

Affected versions

- 2.1.10

Patched versions

2.1.11

Description

Summary

Remote user-controlled data tags can reach a Unicode normalization with a compatibility form NFKD. Under Windows, such normalization is costly in resources and may lead to denial of service with attacks such as One Million Unicode payload. This can get worse with the use of special Unicode characters like U+2100 (℀), or U+2105 (℅) which could lead the payload size to be tripled.

Impact

  • An HTTP request payloaded tags value of a million time '℅', something like "℅℅℅℅℅℅℅℅℅℅℅℅℅℅℅℅℅℅℅℅....℅℅℅" would cause a denial of service in a Windows environment due to the costly use of Unicode normalization directly from a user controlled data with no size limitation.
  • Impact is limited to Windows deployments only.

Affected versions

Versions prior to 2.1.11 are affected by this vulnerability. The patch is included in 2.1.11.

References:

Severity

Moderate

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
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

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:L/UI:N/S:U/C:N/I:N/A:L

CVE ID

CVE-2024-45412

Weaknesses

Credits