CVE-2023-31129 Contiki-NG missing NULL pointer check in IPv6 neighbor discovery
Attackers can cause a denial of service in Contiki-NG by sending crafted IPv6 Router Solicitation messages that trigger a NULL pointer dereference.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-31129?
CVE-2023-31129 is a high-severity vulnerability in contiki-ng, published on 8 May 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Contiki-NG operating system versions 4.8 and prior can be triggered to dereference a NULL pointer in the message handling code for IPv6 router solicitiations. Contiki-NG contains an implementation of IPv6 Neighbor Discovery (ND) in the module `os/net/ipv6/uip-nd6.c`. The ND protocol includes a message type called Router Solicitation (RS), which is used to locate routers and update their address information via the SLLAO (Source Link-Layer Address Option). If the indicated source address changes, a given neighbor entry is set to the STALE state.
The message handler does not check for RS messages with an SLLAO that indicates a link-layer address change that a neighbor entry can actually be created for the indicated address. The resulting pointer is used without a check, leading to the dereference of a NULL pointer of type `uip_ds6_nbr_t`.
The problem has been patched in the `develop` branch of Contiki-NG, and will be included in the upcoming 4.9 release. As a workaround, users can apply Contiki-NG pull request #2271 to patch the problem directly.
Weakness: CWE-476
Which versions are affected by CVE-2023-31129?
It affects 1 product.
Products include Contiki-Ng Contiki-Ng.
How do I fix CVE-2023-31129?
No fix has been published for CVE-2023-31129 yet. Limit exposure of the affected software until one is available.
Is CVE-2023-31129 being exploited?
There is no known exploitation of CVE-2023-31129 in the wild and no public exploit code.
Other vulnerabilities in contiki-ng
Sources
Also known as GHSA-x29r-5qjg-75mq.