gen-index in GNATS 4.0, 4.1.0, and possibly earlier versions, when installed setuid, does not properly check files passed to the -o argument and opens the file with write access, which allows local users to overwrite arbitrary files.
| Software | From | Fixed in |
|---|---|---|
| gnu / gnats | 4.0 | 4.0.x |
| gnu / gnats | 4.1.0 | 4.1.0.x |