CVE-2020-14934: contiki-ng Out-of-bounds Write

Vulnerability summary

CVE-2020-14934 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in contiki-ng. EPSS estimates a 1.54% chance of exploitation in the next 30 days, higher than 74.6% of scored vulnerabilities. 1 public exploit is recorded.

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. The function parsing the received SNMP request does not verify the input message's requested variables against the capacity of the internal SNMP engine buffer. If the number of variables in the request exceeds the allocated buffer, a memory write out of the buffer boundaries occurs. This write operation provides a possibility to overwrite other variables allocated in the .bss section by the application. Because the sender of the frame is in control of the content that will be written beyond the buffer limits, and there is no strict process memory separation, this issue may allow overwriting of sensitive memory areas of an IoT device.

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