Vim: Heap Buffer Overflow in spell file loading

Description

Vim is an open source, command line text editor. Prior to version 9.2.0450, a heap buffer overflow exists in read_compound() in src/spellfile.c when loading a crafted spell file (.spl) with UTF-8 encoding active. An attacker-controlled length field in the spell file's compound section overflows a 32-bit signed integer multiplication, causing a small buffer to be allocated for a write loop that runs many iterations, overflowing the heap. Because the 'spelllang' option can be set from a modeline, a text file modeline can trigger spell file loading if a malicious .spl file has been planted on the runtimepath. This issue has been patched in version 9.2.0450.

Affected Products

Also Affects

Downstream vendors/products affected by this vulnerability

References

• https://github.com/vim/vim/security/advisories/GHSA-q4jv-r9gj-6cwv(x_refsource_CONFIRM)
• https://github.com/vim/vim/commit/92993329178cb1f72d700fff45ca86e1c2d369f8(x_refsource_MISC)
• https://github.com/vim/vim/releases/tag/v9.2.0450(x_refsource_MISC)

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