CVE-2020-17469
First published: Fri Dec 11 2020(Updated: )
An issue was discovered in FNET through 4.6.4. The code for IPv6 fragment reassembly tries to access a previous fragment starting from a network incoming fragment that still doesn't have a reference to the previous one (which supposedly resides in the reassembly list). When faced with an incoming fragment that belongs to a non-empty fragment list, IPv6 reassembly must check that there are no empty holes between the fragments: this leads to an uninitialized pointer dereference in _fnet_ip6_reassembly in fnet_ip6.c, and causes Denial-of-Service.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| 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-2020-17469?
CVE-2020-17469 is classified as a medium severity vulnerability.
How do I fix CVE-2020-17469?
To fix CVE-2020-17469, update the affected software to the latest version provided by the vendor.
What systems are affected by CVE-2020-17469?
CVE-2020-17469 affects multiple open-source software including FNET, uIP-Contiki-OS, Contiki-NG, and open-iscsi.
What kind of attack can exploit CVE-2020-17469?
CVE-2020-17469 can potentially be exploited through IPv6 fragment reassembly attacks.
Is CVE-2020-17469 a zero-day vulnerability?
CVE-2020-17469 is not a zero-day vulnerability since a patch has been made available.
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