CVE-2020-14936: contiki-ng Out-of-bounds Write

Vulnerability summary

CVE-2020-14936 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in contiki-ng. EPSS estimates a 1.42% chance of exploitation in the next 30 days, higher than 72.6% of scored vulnerabilities.

Timeline

1. 18-08-2020
   PublishedVulnerability first disclosed.
2. 04-08-2024
   Last modifiedVulnerability information updated.

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.

• CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.