Out-of-bounds Read in Contiki-Ng
CVE-2023-37459
Contiki-NG is an operating system for internet-of-things devices. In versions 4.9 and prior, when a packet is received, the Contiki-NG network stack attempts to start the periodic TCP timer if it is a TCP packet with the SYN flag set. But the implementation does not first verify that a full TCP header has been received. Specifically, the implementation attempts to access the flags field from the TCP buffer in the following conditional expression in the `check_for_tcp_syn` function. For this reason, an attacker can inject a truncated TCP packet, which will lead to an out-of-bound read from the packet buffer. As of time of publication, a patched version is not available. As a workaround, one can apply the changes in Contiki-NG pull request #2510 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-6648-m23r-hq8c (Vendor Advisory)
- github.com/contiki-ng/contiki-ng/pull/2510 (Patch, Issue Tracking)
Frequently asked questions
- What is CVE-2023-37459?
- CVE-2023-37459 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-2023-37459?
- Medium severity. CVSS v3 base score is 5.3 out of 10.