Buffer overflow in Contiki-Ng
CVE-2021-21257
Contiki-NG is an open-source, cross-platform operating system for internet of things devices. The RPL-Classic and RPL-Lite implementations in the Contiki-NG operating system versions prior to 4.6 do not validate the address pointer in the RPL source routing header This makes it possible for an attacker to cause out-of-bounds writes with packets injected into the network stack. Specifically, the problem lies in the rpl_ext_header_srh_update function in the two rpl-ext-header.c modules for RPL-Classic and RPL-Lite respectively. The addr_ptr variable is calculated using an unvalidated CMPR field value from the source routing header. An out-of-bounds write can be triggered on line 151 in os/net/routing/rpl-lite/rpl-ext-header.c and line 261 in os/net/routing/rpl-classic/rpl-ext-header.c, which contain the following memcpy call with addr_ptr as destination. The problem has been patched in Contiki-NG 4.6. Users can apply a patch out-of-band as a workaround.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L.
EPSS exploit prediction
EPSS: 0.011 (64.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000
Affected products
- Contiki-Ng — versions < 4.6
Weakness classification (CWE)
References
- github.com/contiki-ng/contiki-ng/security/advisories/GHSA-mvc7-9p4q-c5cm (Patch, Third Party Advisory)
- github.com/contiki-ng/contiki-ng/pull/1431 (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-21257?
- CVE-2021-21257 is a high-severity vulnerability in Contiki-Ng, classified under Out-of-bounds Write. CVSS score: 8.2/10. Published 2021-06-18.
- How severe is CVE-2021-21257?
- High severity. CVSS v3 base score is 8.2 out of 10.