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CVE-2023-43742

CRITICALCVSS 9.8/10EPSS 0.92%

Last modified

CVE-2023-43742 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An authentication bypass in Zultys MX-SE, MX-SE II, MX-E, MX-Virtual, MX250, and MX30 with firmware versions prior to 17.0.10 patch 17161 and 16.04 patch 16109 allows an unauthenticated attacker to obtain an administrative session via a protection mechanism failure in the authentication function. In normal operation, the Zultys MX Administrator Windows client connects to port 7505 and attempts authentication, submitting the administrator username and password to the server. EPSS estimates a 0.92% chance of exploitation in the next 30 days.

Description

An authentication bypass in Zultys MX-SE, MX-SE II, MX-E, MX-Virtual, MX250, and MX30 with firmware versions prior to 17.0.10 patch 17161 and 16.04 patch 16109 allows an unauthenticated attacker to obtain an administrative session via a protection mechanism failure in the authentication function. In normal operation, the Zultys MX Administrator Windows client connects to port 7505 and attempts authentication, submitting the administrator username and password to the server. Upon authentication failure, the server sends a login failure message prompting the client to disconnect. However, if the client ignores the failure message instead and attempts to continue, the server does not forcibly close the connection and processes all subsequent requests from the client as if authentication had been successful.

Metrics

CVSS 3.1
9.8/10

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

EPSS Probability
0.92%

55.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
ZultysMx-Se Firmware< 16.0.4
ZultysMx-Se Firmware>= 17.0.6, < 17.0.10
ZultysMx-Se Ii Firmware< 16.0.4
ZultysMx-Se Ii Firmware>= 17.0.6, < 17.0.10
ZultysMx-E Firmware< 16.0.4
ZultysMx-E Firmware>= 17.0.6, < 17.0.10
ZultysMx-Virtual Firmware< 16.0.4
ZultysMx-Virtual Firmware>= 17.0.6, < 17.0.10
ZultysMx250 Firmware< 16.0.4
ZultysMx250 Firmware>= 17.0.6, < 17.0.10
ZultysMx30 Firmware< 16.0.4
ZultysMx30 Firmware>= 17.0.6, < 17.0.10

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2023-43742?
An authentication bypass in Zultys MX-SE, MX-SE II, MX-E, MX-Virtual, MX250, and MX30 with firmware versions prior to 17.0.10 patch 17161 and 16.04 patch 16109 allows an unauthenticated attacker to obtain an administrative session via a protection mechanism failure in the authentication function. In normal operation, the Zultys MX Administrator Windows client connects to port 7505 and attempts authentication, submitting the administrator username and password to the server. Upon authentication failure, the server sends a login failure message prompting the client to disconnect. However, if the client ignores the failure message instead and attempts to continue, the server does not forcibly close the connection and processes all subsequent requests from the client as if authentication had been successful.
How severe is CVE-2023-43742?
CVE-2023-43742 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.92% probability of exploitation in the next 30 days.
How do I fix CVE-2023-43742?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-43742?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST