Out-of-bounds read in Vim - #VU165810

Vulnerability details

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

The vulnerability exists due to an out-of-bounds read in Vim's spell file processing when free_sal_items() interprets soundfolding pointers from an SN_SOFO section as salitem_T entries while loading a second SN_SOFO section. A remote attacker can trick a victim into opening a file whose modeline enables 'spell' and sets 'spelllang' to a crafted .spl file containing two SN_SOFO sections, with 'modeline' enabled, to crash Vim.

Exploitation also requires a multi-byte 'encoding', such as utf-8.

Affected software

Remediation

External References

• https://github.com/vim/vim/security/advisories/GHSA-26qr-jvfj-hcwm
• https://github.com/vim/vim/commit/bdcb63d47fa5e86406a7b04a0ab62638018fb6b5

Related Security Bulletins

• Out-of-bounds read in Vim