CVE-2023-33973

RIOT-OS vulnerable to NULL pointer dereference during NHC encoding

Description

RIOT-OS, an operating system for Internet of Things (IoT) devices, contains a network stack with the ability to process 6LoWPAN frames. In versions 2023.01 and prior, an attacker can send a crafted frame which is forwarded by the device. During encoding of the packet a NULL pointer dereference occurs. This crashes the device leading to denial of service. A patch is available at pull request 19678. There are no known workarounds.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.22%
Vendor Advisory github.com
Affected: RIOT-OS RIOT
Published at:
Updated at:

References

Link Tags
https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-r2pv-3jqc-vh7w vendor advisory
https://github.com/RIOT-OS/RIOT/pull/19678 patch issue tracking
https://github.com/RIOT-OS/RIOT/commit/c9d7863e5664a169035038628029bb07e090c5ff patch
https://github.com/RIOT-OS/RIOT/blob/f41b4b67b6affca0a8b32edced7f51088696869a/sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c#L1067 product
https://github.com/RIOT-OS/RIOT/blob/f41b4b67b6affca0a8b32edced7f51088696869a/sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c#L1495 product
https://github.com/RIOT-OS/RIOT/blob/f41b4b67b6affca0a8b32edced7f51088696869a/sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c#L1511 product
https://github.com/RIOT-OS/RIOT/blob/f41b4b67b6affca0a8b32edced7f51088696869a/sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c#L1644 product
https://github.com/RIOT-OS/RIOT/blob/f41b4b67b6affca0a8b32edced7f51088696869a/sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c#L1655 product

Frequently Asked Questions

What is the severity of CVE-2023-33973?
CVE-2023-33973 has been scored as a high severity vulnerability.
How to fix CVE-2023-33973?
To fix CVE-2023-33973, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-33973 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-33973 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-33973?
CVE-2023-33973 affects RIOT-OS RIOT.
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