CVE-2022-3520: 
NixOS vulnerability analysis and mitigation

CVE-2022-3520 is a Heap-based Buffer Overflow vulnerability discovered in GitHub repository vim/vim affecting versions prior to 9.0.0765. The vulnerability was disclosed on December 2, 2022, impacting various distributions of Vim, including Ubuntu, Debian, and Red Hat systems (NVD, Ubuntu).

The vulnerability occurs when using a put command column with a visual block, where the column may become negative, leading to a heap-based buffer overflow condition. The issue has been assigned a CVSS v3.1 base score of 9.8 (Critical) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H (Ubuntu).

If successfully exploited, this vulnerability could lead to multiple severe consequences including disclosure of sensitive information, addition or modification of data, or a Denial of Service (DoS). The critical CVSS score indicates potential for complete system compromise with high impacts on confidentiality, integrity, and availability (NetApp Security).

The vulnerability has been fixed in vim version 9.0.0765 and later. Users are advised to upgrade to the patched version. For Ubuntu systems, specific package versions have been released: vim-common 2:8.0.1453-1ubuntu1.13+esm5 and related packages. The fix involves implementing checks to ensure that the column does not become negative during put operations (Broadcom Support).