CVE-2020-14935: contiki-ng Out-of-bounds Write

Vulnerability summary

CVE-2020-14935 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in contiki-ng. EPSS estimates a 2.50% chance of exploitation in the next 30 days, higher than 84.5% 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 bulk get request response encoding function. 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. When a bulk get request response is assembled, a stack buffer dedicated for OIDs (with a limited capacity) is allocated in snmp_engine_get_bulk(). When snmp_engine_get_bulk() is populating the stack buffer, an overflow condition may occur due to lack of input length validation. This makes it possible to overwrite stack regions beyond the allocated buffer, including the return address from the function. As a result, the code execution path may be redirected to an address provided in the SNMP bulk get payload. If the target architecture uses common addressing space for program and data memory, it may also be possible to supply code in the SNMP request payload, and redirect the execution path to the remotely injected code, by modifying the function's return address.

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