The (1) gendef.sh, (2) doc/fixinfo.sh, and (3) contrib/gdiffmk/tests/runtests.in scripts in GNU troff (aka groff) 1.21 and earlier allow local users to overwrite arbitrary files via a symlink attack on a gro#####.tmp or /tmp/##### temporary file.
The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Groff | Gnu | * | 1.21 (including) |
| Groff | Gnu | 1.10 (including) | 1.10 (including) |
| Groff | Gnu | 1.11 (including) | 1.11 (including) |
| Groff | Gnu | 1.11a (including) | 1.11a (including) |
| Groff | Gnu | 1.14 (including) | 1.14 (including) |
| Groff | Gnu | 1.15 (including) | 1.15 (including) |
| Groff | Gnu | 1.16 (including) | 1.16 (including) |
| Groff | Gnu | 1.16.1 (including) | 1.16.1 (including) |
| Groff | Gnu | 1.17.1 (including) | 1.17.1 (including) |
| Groff | Gnu | 1.17.2 (including) | 1.17.2 (including) |
| Groff | Gnu | 1.18.1 (including) | 1.18.1 (including) |
| Groff | Gnu | 1.19 (including) | 1.19 (including) |
| Groff | Gnu | 1.19.1 (including) | 1.19.1 (including) |
| Groff | Gnu | 1.19.2 (including) | 1.19.2 (including) |
| Groff | Gnu | 1.20 (including) | 1.20 (including) |
| Groff | Gnu | 1.20.1 (including) | 1.20.1 (including) |