PT-2020-1751 · Moxa · Moxa Awk-3131A

Published 2020-02-25 · Updated 2022-06-13 · CVE-2019-5140

Positive Technologies (AI Summary)

CVSS v2.0

9.0

High

Base vector

AV:N/AC:L/Au:S/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions Moxa AWK-3131A firmware version 1.13

Description The issue exists due to the lack of neutralization of special elements used in an operating system command. This allows for a command injection vulnerability in the iwwebs functionality, where a specially crafted diagnostic script file name can cause user input to be reflected in a subsequent iwsystem call. As a result, an attacker can gain remote control over the device by sending commands while authenticated as a low-privilege user.

Recommendations For Moxa AWK-3131A firmware version 1.13, consider disabling the iwsystem call or restricting access to the diagnostic script functionality until a patch is available. Additionally, limit the privileges of low-privilege users to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

OS Command Injection

Weakness Enumeration

CWE-78

Related Identifiers

BDU:2020-00991

CVE-2019-5140

Affected Products

Moxa Awk-3131A

References · 8

• https://osv.dev/vulnerability/CVE-2019-5140 · Vendor Advisory
• https://bdu.fstec.ru/vul/2020-00991 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2019-5140 · Security Note
• https://moxa.ru/novosti/tidings/prod/ustranenie-uyazvimostej-tochek-dostupa-moxa-awk-3131a · Note
• https://talosintelligence.com/vulnerability_reports/TALOS-2019-0929 · Note
• https://t.me/cvenotify/1206 · Telegram Post
• https://moxa.com/en/support/support/security-advisory/awk-3131a-series-industrial-ap-bridge-client-vulnerabilities · Note
• https://t.me/cvenotify/31540 · Telegram Post