Improper input validation in Contiki-Os Contiki
CVE-2020-17439
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.032 (88.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 88.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.032 · newest: 0.032 · change: 0.000
Affected products
- Contiki-Os Contiki — versions 3.0
- Uip Project — versions 1.0
Weakness classification (CWE)
References
- www.kb.cert.org/vuls/id/815128 (US Government Resource, Third Party Advisory)
- us-cert.cisa.gov/ics/advisories/icsa-20-343-01 (US Government Resource, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-17439?
- CVE-2020-17439 is a high-severity vulnerability in Contiki-Os Contiki, classified under Improper Input Validation. CVSS score: 8.3/10. Published 2020-12-11.
- How severe is CVE-2020-17439?
- High severity. CVSS v3 base score is 8.3 out of 10.