Внезапно открыл доки апача и в разделе про логи обнаружил там следующую интересную инфу:
Anyone who can write to the directory where Apache is writing a log file can almost certainly gain access to the uid that the server is started as, which is normally root. Do NOT give people write access to the directory the logs are stored in without being aware of the consequences; see the security tips document for details.
Это каким образом такое может быть и почему оно так?