Vulnerability · Published Aug 18, 2020 · Assigned by mitre
CVE-2020-14936
Critical 9.8
In plain English
A critical-severity security flaw in the affected software. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.4% (higher than 73% of all known vulnerabilities).
Official description
Buffer overflows were discovered in Contiki-NG 4.4 through 4.5, in the SNMP agent. Functions parsing the OIDs in SNMP requests lack sufficient allocated target-buffer capacity verification when writing parsed OID values. The function snmp_oid_decode_oid() may overwrite memory areas beyond the provided target buffer, when called from snmp_message_decode() upon an SNMP request reception. Because the content of the write operations is externally provided in the SNMP requests, it enables a remote overwrite of an IoT device's memory regions beyond the allocated buffer. This overflow may allow remote overwrite of stack and statically allocated variables memory regions by sending a crafted SNMP request.
Affected products (as reported)
References
- https://drive.google.com/file/d/1FypWH_g475jSL0mDFzquaATCeRIHQ2kj/view?usp=sharing x_refsource_MISC
- https://github.com/contiki-ng/contiki-ng/issues/1351 x_refsource_MISC