Advisory Details

February 1st, 2022

(Pwn2Own) Samba fruit_pwrite Heap-based Buffer Overflow Remote Code Execution Vulnerability

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 fruit_pwrite 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 heap-based buffer. An attacker can leverage this vulnerability to execute 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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