(Pwn2Own) Netatalk ad_addcomment Stack-based Buffer Overflow Remote Code Execution Vulnerability

March 23rd, 2022
ZDI-22-530 ZDI-CAN-15876

CVE ID

CVE-2022-0194

CVSS Score

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

Affected Vendors

Netatalk

Affected Products

Netatalk

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Netatalk. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the ad_addcomment function. 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 root.

Additional Details

Netatalk has issued an update to correct this vulnerability. More details can be found at:
https://netatalk.sourceforge.io/3.1/ReleaseNotes3.1.13.html

Disclosure Timeline

  • 2021-12-03 - Vulnerability reported to vendor
  • 2022-03-23 - Coordinated public release of advisory

Credit

Theori (@theori_io)

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