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Buffer Over-Read (CWE-126) in DNS Response Parser

Critical
aggarg published GHSA-ppcp-rg65-58mv Jun 24, 2024

Package

FreeRTOS-Plus-TCP (FreeRTOS-Plus-TCP)

Affected versions

4.0.0, 4.1.0

Patched versions

>=4.1.1

Description

Summary

FreeRTOS-Plus-TCP versions 4.0.0 through 4.1.0 contain a buffer over-read issue in the DNS Response Parser when parsing domain names in a DNS response. A carefully crafted DNS response with domain name length value greater than the actual domain name length, could cause the parser to read beyond the DNS response buffer.

Impact

This issue affects applications using DNS functionality of the FreeRTOS-Plus-TCP stack. Applications that do not use DNS functionality are not affected, even when the DNS functionality is enabled.

Impacted versions:

4.0.0, 4.1.0

Patches

This is fixed in FreeRTOS-Plus-TCP versions 4.1.1 or later.

References

[1] Vulnerability reporting page: https://aws.amazon.com/security/vulnerability-reporting

[2] https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.1.1

Severity

Critical

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
Changed
Confidentiality
High
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:L/UI:N/S:C/C:H/I:N/A:H

CVE ID

CVE-2024-38373

Weaknesses

Credits