Linux Kernel nft_exthdr_tcp_eval Stack-based Buffer Overflow Information Disclosure Vulnerability
Vulnerability Details
This vulnerability allows local attackers to disclose sensitive information on affected installations of the Linux Kernel. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.
The specific flaw exists within the nft_exthdr_tcp_eval 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 in conjunction with other vulnerabilities to execute arbitrary code in the context of the kernel.
Additional Details
Linux has issued an update to correct this vulnerability. More details can be found at:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.1.67&id=d9ebfc0f21377690837ebbd119e679243e0099cc
Disclosure Timeline
- 2023-09-05 - Vulnerability reported to vendor
- 2024-03-28 - Coordinated public release of advisory
- 2024-07-01 - Advisory Updated
Credit
Alex Birnberg
