Advisory Details

February 15th, 2022

(Pwn2Own) Lexmark MC3224i Web Configuration File Code Injection Remote Code Execution Vulnerability

ZDI-22-332
ZDI-CAN-15844

CVE ID CVE-2021-44734
CVSS SCORE 8.8, (AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
AFFECTED VENDORS Lexmark
AFFECTED PRODUCTS MC3224i
VULNERABILITY DETAILS

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Lexmark MC3224i printers. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the HTTP server. The issue results from the lack of proper validation of a user-supplied string before using it to write to a configuration file. An attacker can leverage this vulnerability to execute code in the context of the www-data user.

ADDITIONAL DETAILS Lexmark has issued an update to correct this vulnerability. More details can be found at:
https://publications.lexmark.com/publications/security-alerts/CVE-2021-44734.pdf
DISCLOSURE TIMELINE
  • 2022-01-21 - Vulnerability reported to vendor
  • 2022-02-15 - Coordinated public release of advisory
CREDIT DEVCORE Research Team
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