CVE-2023-37281
The value of `postcount` depends on the address compression used in the received packet and can be controlled by the attacker.
Does this matter?
Lower severity and a low EPSS score (0.39%). Track it; it rarely justifies an emergency change on its own.
Description
Contiki-NG is an operating system for internet-of-things devices. In versions 4.9 and prior, when processing the various IPv6 header fields during IPHC header decompression, Contiki-NG confirms the received packet buffer contains enough data as needed for that field. But no similar check is done before decompressing the IPv6 address. Therefore, up to 16 bytes can be read out of bounds on the line with the statement `memcpy(&ipaddr->u8[16 - postcount], iphc_ptr, postcount);`. The value of `postcount` depends on the address compression used in the received packet and can be controlled by the attacker. As a result, an attacker can inject a packet that causes an out-of-bound read. As of time of publication, a patched version is not available. As a workaround, one can apply the changes in Contiki-NG pull request #2509 to patch the system.
- CVSS 3.1
- 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- EPSS
- 0.39% probability · 32th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-125
- Affected
- contiki-ng/contiki-ng
- Source
- security-advisories@github.com
References
- https://github.com/contiki-ng/contiki-ng/pull/2509Issue Tracking, Patch
- https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-2v4c-9p48-g9prVendor Advisory
- https://github.com/contiki-ng/contiki-ng/pull/2509Issue Tracking, Patch
- https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-2v4c-9p48-g9prVendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.