Q-Dir (64-bit)

What's new in this version:

This is a security patch release with the following fixes:
- CVE-2021-1386: Fix for UnRAR DLL load privilege escalation. Affects 0.103.1 and prior on Windows only
- CVE-2021-1252: Fix for Excel XLM parser infinite loop. Affects 0.103.0 and 0.103.1 only
- CVE-2021-1404: Fix for PDF parser buffer over-read; possible crash. Affects 0.103.0 and 0.103.1 only
- CVE-2021-1405: Fix for mail parser NULL-dereference crash. Affects 0.103.1 and prior
- Fix possible memory leak in PNG parser
- Fix ClamOnAcc scan on file-creation race condition so files are scanned after their contents are written
- FreshClam: Deprecate the SafeBrowsing config option. The SafeBrowsing option will no longer do anything. For more details, see our blog post from last year about the future of the ClamAV Safe Browsing database.
- DatabaseCustomURL option in freshclam.conf to download it
- FreshClam: Improved HTTP 304, 403 and 429 handling
- FreshClam: Added the mirrors.dat file back to the database directory

This new mirrors.dat file will store:
- A randomly generated UUID for the FreshClam User-Agent
- A retry-after timestamp that so FreshClam won't try to update after having received an HTTP 429 response until the Retry-After timeout has expired
- FreshClam will now exit with a failure in daemon mode if an HTTP 403 (Forbidden) was received because the outcome won't change if it tries again later. The FreshClam user will have to take appropriate action to get unblocked.
- Fix the FreshClam mirror-sync issue where a downloaded database is "older than the version advertised."