Bug#289573: ssh: IMHO LoginGraceTime default value is too long
Package: ssh
Version: 1:3.8.1p1-8.sarge.4
Severity: important
ObSeverity: I think this issue is important due to the denial of service
rammifications involved, however I respect your opinion, and you may
downgrade the severity as you see fit.
I my opinion, a LoginGraceTime of 10 minutes is really bad, as I have
personally seen on a number of occasions, my server get totally blocked
up by unauthenticated SSH connections (presumably relating to the
brute-force SSH attacks running around at the moment) and if I didn't
have an SSH connection already open, I wouldn't be able to login for 10
minutes, or potentially longer if someone was actively trying to gum up
the works and constantly make SSH connections.
I can't think of any reason why you'd want to leave an unauthenticated
SSH connection open for that long. I think even 60 seconds is pretty
generous.
regards
Andrew
-- System Information:
Debian Release: 3.1
APT prefers testing
APT policy: (500, 'testing')
Architecture: i386 (i686)
Kernel: Linux 2.6.8-1-686
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Versions of packages ssh depends on:
ii adduser 3.59 Add and remove users and groups
ii debconf 1.4.30.11 Debian configuration management sy
ii dpkg 1.10.25 Package maintenance system for Deb
ii libc6 2.3.2.ds1-18 GNU C Library: Shared libraries an
ii libpam-modules 0.76-22 Pluggable Authentication Modules f
ii libpam-runtime 0.76-22 Runtime support for the PAM librar
ii libpam0g 0.76-22 Pluggable Authentication Modules l
ii libssl0.9.7 0.9.7e-2 SSL shared libraries
ii libwrap0 7.6.dbs-6 Wietse Venema's TCP wrappers libra
ii zlib1g 1:1.2.2-3 compression library - runtime
-- debconf information:
ssh/insecure_rshd:
ssh/privsep_ask: true
ssh/user_environment_tell:
* ssh/forward_warning:
ssh/insecure_telnetd:
ssh/new_config: true
* ssh/use_old_init_script: true
* ssh/SUID_client: true
ssh/disable_cr_auth: false
* ssh/privsep_tell:
ssh/ssh2_keys_merged:
* ssh/protocol2_only: true
ssh/encrypted_host_key_but_no_keygen:
* ssh/run_sshd: true
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