| Package | Affected versions | Patched versions |
|---|---|---|
| postgresql | ≥ 15.0, < 15.18≥ 16.0, < 16.14≥ 17.0, < 17.10≥ 18.0, < 18.4< 14.23 | 15.1816.1417.1018.414.23 |
Symlink following in PostgreSQL pg_basebackup plain format and in pg_rewind allows an origin superuser to overwrite local files, e.g. /var/lib/postgres/.bashrc, that hijack the operating system account. It will remain the case that starting the server after these commands implicitly trusts the origin superuser, due to features like shared_preload_libraries. Hence, the attack has practical implications only if one takes relevant action between these commands and server start, like moving the files to a different VM or snapshotting the VM. Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.
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