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zdiSimon Janz (@esj4y)ZDI-23-720
HistoryMay 24, 2023 - 12:00 a.m.

Moxa MXsecurity Series Hardcoded JWT Key Authentication Bypass Vulnerability

2023-05-2400:00:00
Simon Janz (@esj4y)
www.zerodayinitiative.com
10

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

7.5 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

0.002 Low

EPSS

Percentile

54.3%

This vulnerability allows remote attackers to bypass authentication on affected installations of Moxa MXsecurity Series appliances. Authentication is not required to exploit this vulnerability. The specific flaw exists within the configuration of the web-based interface. The issue results from a hardcoded JWT secret within the application configuration. An attacker can leverage this vulnerability to bypass authentication on the system.

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

7.5 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

0.002 Low

EPSS

Percentile

54.3%

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