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