(Pwn2Own) Samba fruit_pread Out-Of-Bounds Read Information Disclosure Vulnerability

February 1st, 2022
ZDI-22-245 ZDI-CAN-15833

CVE ID

CVE-2021-44142

CVSS Score

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

Affected Vendors

Samba

Affected Products

Samba

Vulnerability Details

This vulnerability allows remote attackers to disclose sensitive information on affected installations of Samba. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the fruit_pread method. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated buffer. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of root.

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

  • 2021-12-03 - Vulnerability reported to vendor
  • 2022-02-01 - Coordinated public release of advisory
  • 2022-02-01 - Advisory Updated

Credit

Nguyen Hoang Thach (https://twitter.com/hi_im_d4rkn3ss) and Billy Jheng Bing-Jhong (https://twitter.com/st424204)

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