CVE-2020-17440
First published: Fri Dec 11 2020(Updated: )
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 domain names present in the DNS responses have '\0' termination. This results in errors when calculating the offset of the pointer that jumps over domain name bytes in DNS response packets when a name lacks this termination, and eventually leads to dereferencing the pointer at an invalid/arbitrary address, within newdata() and parse_name() in resolv.c.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Uip Project Uip | =1.0 | |
| Contiki-os Contiki | =3.0 | |
| Multiple (open source) picoTCP-NG, Version 1.7.0 and prior | ||
| Multiple (open source) picoTCP (EOL), Version 1.7.0 and prior | ||
| Multiple (open source) FNET, Version 4.6.3 | ||
| Multiple (open source) Nut/Net, Version 5.1 and prior |
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Reference Links
Frequently Asked Questions
What is CVE-2020-17440?
CVE-2020-17440 is a vulnerability in uIP 1.0 as used in Contiki 3.0 and other products.
How does CVE-2020-17440 impact systems?
CVE-2020-17440 allows attackers to cause denial-of-service conditions by sending specially crafted DNS packets.
What is the severity of CVE-2020-17440?
The severity of CVE-2020-17440 is high, with a CVSS score of 7.5.
How do I fix CVE-2020-17440?
To fix CVE-2020-17440, update to a patched version of uIP or Contiki that addresses the vulnerability.
Where can I find more information about CVE-2020-17440?
You can find more information about CVE-2020-17440 at the following references: [https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01](https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01) and [https://www.kb.cert.org/vuls/id/815128](https://www.kb.cert.org/vuls/id/815128)
- collector/nvd-index
- agent/type
- agent/last-modified-date
- agent/first-publish-date
- collector/ics-cert-advisory
- source/ICS
- agent/software-canonical-lookup
- agent/severity
- agent/weakness
- agent/author
- agent/references
- agent/softwarecombine
- agent/event
- agent/description
- agent/tags
- collector/mitre-cve
- source/MITRE
- vendor/uip project
- canonical/uip project uip
- version/uip project uip/1.0
- vendor/contiki-os
- canonical/contiki-os contiki
- version/contiki-os contiki/3.0
- vendor/multiple (open source)
- canonical/multiple (open source) picotcp-ng, version 1.7.0 and prior
- canonical/multiple (open source) picotcp (eol), version 1.7.0 and prior
- canonical/multiple (open source) fnet, version 4.6.3
- canonical/multiple (open source) nut/net, version 5.1 and prior