Samba AppleDouble Entry Heap-based Buffer Overflow Remote Code Execution Vulnerability

February 1st, 2022
ZDI-22-244 ZDI-CAN-16156

CVE ID

CVE-2021-44142

CVSS Score

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

Affected Vendors

Samba

Affected Products

Samba

Vulnerability Details

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

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

Additional Details

Samba has issued an update to correct this vulnerability. More details can be found at:
https://www.samba.org/samba/security/CVE-2021-44142.html

Disclosure Timeline

  • 2021-12-15 - Vulnerability reported to vendor
  • 2022-02-01 - Coordinated public release of advisory

Credit

Lucas Leong (@_wmliang_) of Trend Micro Zero Day Initiative

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