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.
References
Link | Resource |
---|---|
https://github.com/contiki-ng/contiki-ng/pull/2271 | Product |
https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-x29r-5qjg-75mq | Patch Vendor Advisory |
Configurations
History
No history.
Information
Published : 2023-05-08 21:15
Updated : 2024-02-28 20:13
NVD link : CVE-2023-31129
Mitre link : CVE-2023-31129
CVE.ORG link : CVE-2023-31129
JSON object : View
Products Affected
contiki-ng
- contiki-ng
CWE
CWE-476
NULL Pointer Dereference