Out-of-bounds Read in Contiki-Ng
CVE-2023-37281
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (37.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 37.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001
Affected products
- Contiki-Ng — versions <= 4.9
Weakness classification (CWE)
References
- github.com/contiki-ng/contiki-ng/security/advisories/GHSA-2v4c-9p48-g9pr (Vendor Advisory)
- github.com/contiki-ng/contiki-ng/pull/2509 (Patch, Issue Tracking)
Frequently asked questions
- What is CVE-2023-37281?
- CVE-2023-37281 is a medium-severity vulnerability in Contiki-Ng, classified under Out-of-bounds Read. CVSS score: 5.3/10. Published 2023-09-15.
- How severe is CVE-2023-37281?
- Medium severity. CVSS v3 base score is 5.3 out of 10.