CVE-2023-38618: 
NixOS vulnerability analysis and mitigation

Multiple integer overflow vulnerabilities exist in the VZT facgeometry parsing functionality of GTKWave 3.3.115. The vulnerability (CVE-2023-38618) was discovered in the VZT facgeometry parsing functionality when allocating the rows array. A specially crafted .vzt file can lead to arbitrary code execution, where a victim would need to open a malicious file to trigger these vulnerabilities (Talos).

The vulnerability occurs in the VZT facgeometry parsing functionality when allocating the rows array. When numfacs is bigger than 0x40000000, the multiplication will wrap-around in 32-bit mode, leading to calling malloc with a smaller size. This is followed by a loop over numfacs which writes to all allocated buffers, resulting in multiple out-of-bounds writes on heap. The vulnerability has a CVSS v3.1 Base Score of 7.8 HIGH (Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) (NVD).

The vulnerability can lead to arbitrary code execution. By carefully manipulating heap allocations, the out-of-bounds writes can be used to overwrite pointers inside lt, which can in turn be used to write to arbitrary locations (Talos).

The vulnerability has been fixed in GTKWave version 3.3.118. Users are recommended to upgrade to this version or later. The fix has been included in various distribution updates, including Debian's security update DLA-3785-1 (Debian LTS).