CVE-2020-17470: Input Validation
First published: Fri Dec 11 2020(Updated: )
An issue was discovered in FNET through 4.6.4. The code that initializes the DNS client interface structure does not set sufficiently random transaction IDs (they are always set to 1 in _fnet_dns_poll in fnet_dns.c). This significantly simplifies DNS cache poisoning attacks.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| <=4.6.4 | ||
| butok FNET | <=4.6.4 | |
| Contiki OS | ||
| Contiki-NG | ||
| uIP | ||
| SUSE Open-iSCSI | ||
| altran picoTCP-NG | ||
| picoTCP | ||
| butok FNET | ||
| Nut/Net |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2020-17470?
The severity of CVE-2020-17470 is considered to be high due to its impact on DNS cache poisoning attacks.
How do I fix CVE-2020-17470?
To fix CVE-2020-17470, update FNET to version 4.6.5 or later where the random transaction ID issue has been addressed.
What types of software are affected by CVE-2020-17470?
CVE-2020-17470 affects FNET versions up to 4.6.4 and several other open source networking software including uIP, Contiki, and open-iscsi.
What specific issue does CVE-2020-17470 exploit?
CVE-2020-17470 exploits the lack of randomness in DNS transaction IDs, making it easier for attackers to perform DNS cache poisoning.
Is there a known workaround for CVE-2020-17470?
There are no recommended workarounds for CVE-2020-17470; the best mitigation is to apply the available software update.
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