CVE-2020-17439

HIGH

uIP 1.0 - DNS Cache Poisoning via Improper Input Validation

Title source: llm

Description

An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products. The code that parses incoming DNS packets does not validate that the incoming DNS replies match outgoing DNS queries in newdata() in resolv.c. Also, arbitrary DNS replies are parsed if there was any outgoing DNS query with a transaction ID that matches the transaction ID of an incoming reply. Provided that the default DNS cache is quite small (only four records) and that the transaction ID has a very limited set of values that is quite easy to guess, this can lead to DNS cache poisoning.

References (2)

Core 2

Core References

Third Party Advisory, US Government Resource x_refsource_misc

https://www.kb.cert.org/vuls/id/815128

Third Party Advisory, US Government Resource x_refsource_misc

https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01

Scores

CVSS v3 8.3

EPSS 0.0314

EPSS Percentile 86.3%

Attack Vector NETWORK

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

Details

CWE

CWE-20

Status published

Products (1)

uip_project/uip 1.0

Published Dec 11, 2020

Tracked Since Feb 18, 2026