An exploitable command injection vulnerability exists in the iw_webs functionality of the Moxa AWK-3131A firmware version 1.13. A specially crafted iw_serverip parameter can cause user input to be reflected in a subsequent iw_system call, resulting in remote control over the device. An attacker can send commands while authenticated as a low privilege user to trigger this vulnerability.

References

• https://nvd.nist.gov/vuln/detail/CVE-2019-5141
• https://talosintelligence.com/vulnerability_reports/TALOS-2019-0930