Advisory Details

February 15th, 2022

(Pwn2Own) Lexmark MC3224i setuid Local Privilege Escalation Vulnerability

ZDI-22-329
ZDI-CAN-15895

CVE ID CVE-2021-44735
CVSS SCORE 7.8, (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
AFFECTED VENDORS Lexmark
AFFECTED PRODUCTS MC3224i
VULNERABILITY DETAILS

This vulnerability allows local attackers to escalate privileges on affected installations of Lexmark MC3224i printers. An attacker must first obtain the ability to execute low-privileged code on the target guest system in order to exploit this vulnerability.

The specific flaw exists within the permissions set on root-owned service files. An attacker can leverage this vulnerability to escalate privileges and 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://publications.lexmark.com/publications/security-alerts/CVE-2021-44735.pdf
DISCLOSURE TIMELINE
  • 2021-12-30 - Vulnerability reported to vendor
  • 2022-02-15 - Coordinated public release of advisory
CREDIT David BERARD (@_p0ly_), Vincent FARGUES (@Karion_), Thomas IMBERT (@masthoon), from @Synacktiv
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