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CVE-2018-16598: AWS FreeRTOS may accept forged DNS replies

CVE-2018-16598 · published 7 years ago

Summary

The AWS FreeRTOS and FreeRTOS+TCP software can accept any DNS response without checking that it matches a request it sent. This could let an attacker send false DNS data and redirect traffic. Apply the latest software updates from the vendor to fix the issue.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software

Vendor	Product	Affected versions
amazon	amazon_web_services_freertos	<= 1.3.1 `cpe:2.3:a:amazon:amazon_web_services_freertos::::::::`
amazon	freertos	<= 10.0.1 `cpe:2.3:a:amazon:freertos::::::::`

Original advisory text

An issue was discovered in Amazon Web Services (AWS) FreeRTOS through 1.3.1, FreeRTOS up to V10.0.1 (with FreeRTOS+TCP), and WITTENSTEIN WHIS Connect middleware TCP/IP component. In xProcessReceivedUDPPacket and prvParseDNSReply, any received DNS response is accepted, without confirming it matches a sent DNS request.

References

https://blog.zimperium.com/freertos-tcpip-stack-vulnerabilities-details/ Patch Third Party Advisory
https://blog.zimperium.com/freertos-tcpip-stack-vulnerabilities-put-wide-range-d... Third Party Advisory
https://github.com/aws/amazon-freertos/blob/v1.3.2/CHANGELOG.md Release Notes Third Party Advisory

Fix within

Internet-facing 14 days

Internal 60 days

Not known to be exploited
Can be exploited automatically (estimated)
Gives an attacker partial control (estimated)

Severity

5.9 Medium

Exploitation

2% chance of attack within 30 days

Type

CWE-441Unintended Proxy or Intermediary ('Confused Deputy')

Timeline

Published6 Dec 2018

Updated31 Oct 2026

First seen29 Sep 2026

Sources

CVE-2018-16598 · NVD

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