(Pwn2Own) HP Color LaserJet Pro M479fdw CFF Font Parsing Stack-based Buffer Overflow Remote Code Execution Vulnerability

August 24th, 2023
ZDI-23-1175 ZDI-CAN-19707

CVE ID

CVE-2023-35177

CVSS Score

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

Affected Vendors

HP

Affected Products

Color LaserJet Pro M479fdw

Vulnerability Details

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of HP Color LaserJet Pro M479fdw printers. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the handling of CFF fonts. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the service account.

Additional Details

HP has issued an update to correct this vulnerability. More details can be found at:
https://support.hp.com/us-en/document/ish_8651888-8651916-16/hpsbpi03853

Disclosure Timeline

  • 2022-12-28 - Vulnerability reported to vendor
  • 2023-08-24 - Coordinated public release of advisory

Credit

Interrupt Labs

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