Critical Vulnerability Impacts Over 120 Lexmark Printers

Printer and imaging products manufacturer Lexmark this week published a security advisory to warn users of a critical vulnerability impacting over 120 printer models.

The issue, tracked as CVE-2023-23560 (CVSS score of 9.0), is described as a server-side request forgery (SSRF) flaw in the Web Services feature of newer Lexmark devices, which could be exploited to execute arbitrary code.

“Successful exploitation of this vulnerability can lead to an attacker being able to remotely execute arbitrary code on a device,” Lexmark warns in an advisory (PDF).

The manufacturer lists roughly 125 device models that are impacted by the security defect, including B, C, CS, CX, M, MB, MC, MS, MX, XC, and XM series printers.

The company has announced firmware updates that resolve the vulnerability on all impacted devices and encourages users to find update instructions on its support website.

Additionally, Lexmark says that exploitation of CVE-2023-23560 can be blocked by disabling the Web Services feature on the vulnerable printers (TCP port 65002).

To block TCP port 65002, users would have to go to Settings > Network/Ports > TCP/IP > TCP/IP Port Access, uncheck TCP 65002 ( WSD Print Service ), and then click Save.

Lexmark also warns that, while it is not aware of any malicious attacks targeting the vulnerability, proof-of-concept (PoC) code exploiting it has been made public.

Given that it is not unusual for threat actors to target unpatched printers and other Internet of Things (IoT) devices, users are advised to apply the available patches as soon as possible.

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