CVE-2023-33973: RIOT-OS vulnerable to NULL pointer dereference during NHC encoding
First published: Tue May 30 2023(Updated: )
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.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Riot-os Riot | <=2023.01 |
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Reference Links
- https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-r2pv-3jqc-vh7w
- https://github.com/RIOT-OS/RIOT/blob/f41b4b67b6affca0a8b32edced7f51088696869a/sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c#L1511
- https://github.com/RIOT-OS/RIOT/pull/19678
- https://github.com/RIOT-OS/RIOT/blob/f41b4b67b6affca0a8b32edced7f51088696869a/sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c#L1644
- https://github.com/RIOT-OS/RIOT/blob/f41b4b67b6affca0a8b32edced7f51088696869a/sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c#L1655
- https://github.com/RIOT-OS/RIOT/commit/c9d7863e5664a169035038628029bb07e090c5ff
- https://github.com/RIOT-OS/RIOT/blob/f41b4b67b6affca0a8b32edced7f51088696869a/sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c#L1495
- https://github.com/RIOT-OS/RIOT/blob/f41b4b67b6affca0a8b32edced7f51088696869a/sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c#L1067
Frequently Asked Questions
What is the severity of CVE-2023-33973?
CVE-2023-33973 has been classified as a high severity vulnerability due to its potential exploitation by attackers.
How do I fix CVE-2023-33973?
To fix CVE-2023-33973, upgrade to a version of RIOT-OS later than 2023.01.
What impact does CVE-2023-33973 have on RIOT-OS?
CVE-2023-33973 allows attackers to exploit a NULL pointer dereference in the network stack when processing crafted 6LoWPAN frames.
Which versions of RIOT-OS are affected by CVE-2023-33973?
Versions of RIOT-OS up to and including 2023.01 are affected by CVE-2023-33973.
Can CVE-2023-33973 be exploited remotely?
Yes, CVE-2023-33973 can be exploited remotely as it involves network packet processing.
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