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Re: DoS in debian (potato) proftpd
From: martin f krafft <madduck () madduck net>
Date: Wed, 27 Mar 2002 00:37:59 +0100

also sprach Joe Dollard <joed () devel livenote com> [2002.03.25.2114 +0100]:
      The version of proftp that is in debian potato (1.2.0pre10 as
      reported by running 'proftpd -v ') is vulnerable to a glob DoS
      attack, as discovered on the 15th March 2001. You can verify this
      bug by logging in to a server running debian stable's proftpd and
      type "ls
      */../*/../*/../*/../*/../*/../*/../*/../*/../*/../*/../*/../*".
      This results with 100% of the CPU and memory resources being
      consumed (more info at http://proftpd.linux.co.uk/critbugs.html),

(please fix your line wraps!)

security.debian.org has proftpd_1.2.0pre10-2.0potato1 which does not
contain this bug, at least not on i386 systems:

fishbowl:~> ncftp lapse.home.madduck.net
NcFTP 3.1.2 (Jan 28, 2002) by Mike Gleason (ncftp () ncftp com).
Connecting to 192.168.14.3
ProFTPD 1.2.0pre10 Server (Debian) [lapse.home.madduck.net]
Logging in...

Anonymous access granted, restrictions apply.
Logged in to localhost.
ncftp / > ls */../*/../*/../*/../*/../*/../*/../*/../*/../*/../*/../*/../*
lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/.././fw1-4.1-sp3@
lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../../fw1-4.1-sp3@
lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../fw1-4.1-sp3@
lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/.././fw1-4.1-sp4@
lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../../fw1-4.1-sp4@
lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../fw1-4.1-sp4@
lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/.././fw1-4.1-sp5@
lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../../fw1-4.1-sp5@
lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../lics/../fw1-4.1-sp5@

<and on for another screen full>

fishbowl:~> ssh lapse 'cat /etc/debian_version; uname -a'
2.2r5
Linux lapse 2.2.20 #1 Tue Feb 12 14:22:30 CET 2002 i486

regards,

-- 
martin;              (greetings from the heart of the sun.)
  \____ echo mailto: !#^."<*>"|tr "<*> mailto:"; net () madduck
 
"i'm always frank and earnest with women.
 uh, in new york i'm frank, and in chicago i'm ernest."
                                            -- the long kiss goodnight

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