Out-of-bounds read in Vim - #VU134883

Detailed vulnerability description

The vulnerability allows a remote attacker to disclose sensitive information and cause a denial of service.

The vulnerability exists due to out-of-bounds read in get_text_props() in src/textprop.c when processing a crafted undo file during undo and subsequent line inspection. A remote attacker can supply a malicious source file and sibling .un~ undo file with a forged text property count to disclose sensitive information and cause a denial of service.

User interaction is required: 'undofile' must be enabled, the user must open the file and perform an undo operation, and a consumer such as prop_list() or screen redraw must inspect the restored line.

Remediation

Sources

• https://github.com/vim/vim/security/advisories/GHSA-f36c-2qcp-7gpw
• https://github.com/vim/vim/commit/b2338ca90643e2f01ecb6547c1172716aaec4f79