[pkg-firebird-general] Bug#810599: firebird2.5: authenticated remote crash

[Damyan Ivanov]

Package: firebird2.5-super,firebird2.5-superclassic
Version: 2.5.5.26952.ds4-1
Severity: important
Tags: security upstream fixed-upstream
Forwarded: http://tracker.firebirdsql.org/browse/CORE-5068

Firebird 2.5.5 can be crashed remotely by authenticated clients by invoking 
gbak via the service manager using invalid command line switch.

Example:
  $ gbak -b -se service_mgr -user_all_space srv:db.fdb backup.fbk
  gbak:unknown switch "USER_ALL_SPACE"
  gbak: ERROR:connection lost to database
  gbak:Exiting before completion due to errors

This is harmless for the -classic flavour where the server process serves only 
that particular connection, but is at least a DoS for -super and -superclassic 
where the crashed process serves multiple connections.

Upstream SVN already contains the fix¹, which I'll be uploading soon.

The issue is introduced in 2.5.5, so previous versions (stable and older) 
aren't affected.

-- dam

¹ https://sourceforge.net/p/firebird/code/62783/

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 4.3.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=bg_BG.UTF-8, LC_CTYPE=bg_BG.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)