bugtraq - [USN-34-1] OpenSSH information leakage

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Date: Tue, 30 Nov 2004 12:29:32 +0100
From: Martin Pitt <martin.pitt@...onical.com>
To: ubuntu-security-announce@...ts.ubuntu.com
Cc: bugtraq@...urityfocus.com, full-disclosure@...ts.netsys.com
Subject: [USN-34-1] OpenSSH information leakage

===========================================================
Ubuntu Security Notice USN-34-1		  November 30, 2004
openssh information leakage
CAN-2003-0190
===========================================================

A security issue affects the following Ubuntu releases:

Ubuntu 4.10 (Warty Warthog)

The following packages are affected:

openssh-server

The problem can be corrected by upgrading the affected package to
version 1:3.8.1p1-11ubuntu3.1.  In general, a standard system upgrade is
sufficient to effect the necessary changes.

Details follow:

@Mediaservice.net discovered two information leaks in the OpenSSH
server. When using password authentication, an attacker could
test whether a login name exists by measuring the time between
failed login attempts, i. e. the time after which the "password:"
prompt appears again.

A similar issue affects systems which do not allow root logins over
ssh ("PermitRootLogin no"). By measuring the time between login
attempts an attacker could check whether a given root password is
correct. This allowed determining weak root passwords using a brute
force attack.

  Source archives:

    http://security.ubuntu.com/ubuntu/pool/main/o/openssh/openssh_3.8.1p1-11ubuntu3.1.diff.gz
      Size/MD5:   145620 71fa539badedbda58b58ef29139fd413
    http://security.ubuntu.com/ubuntu/pool/main/o/openssh/openssh_3.8.1p1-11ubuntu3.1.dsc
      Size/MD5:      878 5bdd27605cc38bce0cce01bcf9928808
    http://security.ubuntu.com/ubuntu/pool/main/o/openssh/openssh_3.8.1p1.orig.tar.gz
      Size/MD5:   795948 9ce6f2fa5b2931ce2c4c25f3af9ad50d

  Architecture independent packages:

    http://security.ubuntu.com/ubuntu/pool/main/o/openssh/ssh_3.8.1p1-11ubuntu3.1_all.deb
      Size/MD5:    29960 3d5e1b4e769a8be10b5ad1cd908006c5

  amd64 architecture (Athlon64, Opteron, EM64T Xeon)

    http://security.ubuntu.com/ubuntu/pool/main/o/openssh/openssh-client-udeb_3.8.1p1-11ubuntu3.1_amd64.udeb
      Size/MD5:   159444 ce407a70f38f37485388c34c94393fd9
    http://security.ubuntu.com/ubuntu/pool/main/o/openssh/openssh-client_3.8.1p1-11ubuntu3.1_amd64.deb
      Size/MD5:   523912 ac9f40baaf37c837a8e64c143a34c108
    http://security.ubuntu.com/ubuntu/pool/universe/o/openssh/openssh-server-udeb_3.8.1p1-11ubuntu3.1_amd64.udeb
      Size/MD5:   176144 100759d267228eabdac0a9a23184037a
    http://security.ubuntu.com/ubuntu/pool/main/o/openssh/openssh-server_3.8.1p1-11ubuntu3.1_amd64.deb
      Size/MD5:   263678 d9d4725937238c22b5fa327403bcf245
    http://security.ubuntu.com/ubuntu/pool/main/o/openssh/ssh-askpass-gnome_3.8.1p1-11ubuntu3.1_amd64.deb
      Size/MD5:    53194 4fd64b84d4f0a63701d23d5fd87b52dd

  i386 architecture (x86 compatible Intel/AMD)

    http://security.ubuntu.com/ubuntu/pool/main/o/openssh/openssh-client-udeb_3.8.1p1-11ubuntu3.1_i386.udeb
      Size/MD5:   133700 b2bf27c8cdc5d6cd8ae995313c13f81f
    http://security.ubuntu.com/ubuntu/pool/main/o/openssh/openssh-client_3.8.1p1-11ubuntu3.1_i386.deb
      Size/MD5:   473924 314a6883e04062404aab218bf23b997f
    http://security.ubuntu.com/ubuntu/pool/universe/o/openssh/openssh-server-udeb_3.8.1p1-11ubuntu3.1_i386.udeb
      Size/MD5:   146854 25ef6479f1e832ba4d0d351b57f682d8
    http://security.ubuntu.com/ubuntu/pool/main/o/openssh/openssh-server_3.8.1p1-11ubuntu3.1_i386.deb
      Size/MD5:   241474 f1f1d95c368d3cd50c0bba78b0b7424e
    http://security.ubuntu.com/ubuntu/pool/main/o/openssh/ssh-askpass-gnome_3.8.1p1-11ubuntu3.1_i386.deb
      Size/MD5:    52844 e7b3f36414c2c7b19d9c7c2a10880c33

  powerpc architecture (Apple Macintosh G3/G4/G5)

    http://security.ubuntu.com/ubuntu/pool/main/o/openssh/openssh-client-udeb_3.8.1p1-11ubuntu3.1_powerpc.udeb
      Size/MD5:   151096 287eb4b1f2811762eb7b2d3fdce85493
    http://security.ubuntu.com/ubuntu/pool/main/o/openssh/openssh-client_3.8.1p1-11ubuntu3.1_powerpc.deb
      Size/MD5:   520712 a6bd03bb888f41463ae096d5a2d963a1
    http://security.ubuntu.com/ubuntu/pool/universe/o/openssh/openssh-server-udeb_3.8.1p1-11ubuntu3.1_powerpc.udeb
      Size/MD5:   160180 f44ab8929b5404e7781b8e643523fece
    http://security.ubuntu.com/ubuntu/pool/main/o/openssh/openssh-server_3.8.1p1-11ubuntu3.1_powerpc.deb
      Size/MD5:   257838 f074b6568e4d6eb53fff2c910ce57448
    http://security.ubuntu.com/ubuntu/pool/main/o/openssh/ssh-askpass-gnome_3.8.1p1-11ubuntu3.1_powerpc.deb
      Size/MD5:    54312 7c23a096535c939783f4855d089fa39e

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