Out-of-bounds write in Vim - #VU134580

Detailed vulnerability description

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to out-of-bounds write in the tree_count_words() function in src/spellfile.c when parsing a crafted .spl/.sug spell file pair during spell suggestion loading. A remote attacker can supply a specially crafted spell file pair to cause a denial of service.

User interaction is required: spell checking must be enabled and the user must invoke spell suggestion on a misspelled word.

Remediation

Sources

• https://github.com/vim/vim/security/advisories/GHSA-wgh4-64f7-q3jq
• https://github.com/vim/vim/commit/a80874d9b84a01040e3d1aef2d4a59e1934dafb7