Advisory Details

May 31st, 2024

Lexmark CX331adwe Firmware Downgrade Remote Code Execution Vulnerability

ZDI-24-560
ZDI-CAN-22550

CVE ID CVE-2023-50738
CVSS SCORE 6.3, AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
AFFECTED VENDORS Lexmark
AFFECTED PRODUCTS CX331adwe
VULNERABILITY DETAILS

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Lexmark CX331adwe printers. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the `/usr/bin/hydra` service, which listens on TCP port 9100 by default. The issue results from the lack of proper validation of a firmware image before using it to perform an upgrade. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of root.

ADDITIONAL DETAILS Lexmark has issued an update to correct this vulnerability. More details can be found at:
https://www.lexmark.com/en_us/solutions/security/lexmark-security-advisories.html
DISCLOSURE TIMELINE
  • 2023-12-01 - Vulnerability reported to vendor
  • 2024-05-31 - Coordinated public release of advisory
CREDIT Foundry Zero
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