CVE-2019-5143: moxa awk-3131a_firmware Classic Buffer Overflow

Vulnerability summary

CVE-2019-5143 is a high (CVSS 8.8) Classic Buffer Overflow vulnerability in moxa awk-3131a_firmware. EPSS estimates a 4.47% chance of exploitation in the next 30 days, higher than 91.3% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 25-02-2020
   PublishedVulnerability first disclosed.
2. 04-08-2024
   Last modifiedVulnerability information updated.

Description

An exploitable format string vulnerability exists in the iw_console conio_writestr functionality of the Moxa AWK-3131A firmware version 1.13. A specially crafted time server entry can cause an overflow of the time server buffer, resulting in remote code execution. An attacker can send commands while authenticated as a low privilege user to trigger this vulnerability.

• CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.
• CWE-134Use of Externally-Controlled Format StringThe product uses a function that accepts a format string as an argument, but the format string originates from an external source.