Banner displays two \

Bug #425346 reported by bear24rw on 2009-09-06
This bug affects 4 people
Affects Status Importance Assigned to Milestone
portable OpenSSH
Fix Released
Gentoo Linux
Fix Released
openssh (Debian)
Fix Released
openssh (Ubuntu)
Colin Watson

Bug Description

Binary package hint: openssh-server

In the package openssh-server the banner displays two \ instead of one for example if i have the banner

\ \
\ Welcome \
\ \

it is currently displayed

\\ \\
\\ Welcome \\
\\ \\

To fix this:


Line 417

strnvis(msg, raw, len * 4 + 1, VIS_SAFE|VIS_OCTAL);

should be

strnvis(msg, raw, len * 4 + 1, VIS_SAFE|VIS_OCTAL|VIS_NOSLASH);

Karmic Alpha 5

user@user-laptop:~$ apt-cache policy openssh-server
  Installed: 1:5.1p1-6ubuntu1
  Candidate: 1:5.1p1-6ubuntu1
  Version table:
 *** 1:5.1p1-6ubuntu1 0
        500 karmic/main Packages
        100 /var/lib/dpkg/status

Related branches

Brian Murray (brian-murray) wrote :

Patch as a diff.

Changed in openssh (Ubuntu):
status: New → Triaged
importance: Undecided → Low
Brian Murray (brian-murray) wrote :

This bug is an upstream one and it would be quite helpful if somebody experiencing it could send the bug the to the people writing the software. You can learn more about how to do this for various upstreams at Thanks in advance!

Colin Watson (cjwatson) on 2010-01-02
Changed in openssh (Debian):
importance: Undecided → Unknown
status: New → Unknown
Changed in gentoo:
status: Unknown → Confirmed
Colin Watson (cjwatson) on 2010-01-04
Changed in openssh (Ubuntu):
assignee: nobody → Colin Watson (cjwatson)
status: Triaged → Fix Committed
Launchpad Janitor (janitor) wrote :
Download full text (4.4 KiB)

This bug was fixed in the package openssh - 1:5.2p1-1ubuntu1

openssh (1:5.2p1-1ubuntu1) lucid; urgency=low

  * Resynchronise with Debian. Remaining changes:
    - Add support for registering ConsoleKit sessions on login.
    - Drop openssh-blacklist and openssh-blacklist-extra to Suggests; they
      take up a lot of CD space, and I suspect that rolling them out in
      security updates has covered most affected systems now.
  * Convert to Upstart. The init script is still here for the benefit of
    people running sshd in chroots. Note that the Upstart job does not
    support /etc/default/ssh, because it's much more straightforward to edit
    the job (/etc/init/ssh.conf) than it was to edit the init script.

openssh (1:5.2p1-1) unstable; urgency=low

  * New upstream release (closes: #536182). Yes, I know 5.3p1 has been out
    for a while, but there's no GSSAPI patch available for it yet.
    - Change the default cipher order to prefer the AES CTR modes and the
      revised "arcfour256" mode to CBC mode ciphers that are susceptible to
      CPNI-957037 "Plaintext Recovery Attack Against SSH".
    - Add countermeasures to mitigate CPNI-957037-style attacks against the
      SSH protocol's use of CBC-mode ciphers. Upon detection of an invalid
      packet length or Message Authentication Code, ssh/sshd will continue
      reading up to the maximum supported packet length rather than
      immediately terminating the connection. This eliminates most of the
      known differences in behaviour that leaked information about the
      plaintext of injected data which formed the basis of this attack
      (closes: #506115, LP: #379329).
    - ForceCommand directive now accepts commandline arguments for the
      internal-sftp server (closes: #524423, LP: #362511).
    - Add AllowAgentForwarding to available Match keywords list (closes:
    - Make ssh(1) send the correct channel number for
      avoid triggering 'Non-public channel' error messages on sshd(8) in
    - Avoid printing 'Non-public channel' warnings in sshd(8), since the
      ssh(1) has sent incorrect channel numbers since ~2004 (this reverts a
      behaviour introduced in openssh-5.1; closes: #496017).
    - Disable nonfunctional ssh(1) ~C escape handler in multiplex slave
      connections (closes: #507541).
    - Fix "whitepsace" typo in ssh_config(5) (closes: #514313, LP: #303835).
  * Update to GSSAPI patch from,
    including cascading credentials support (LP: #416958).
  * Use x11.pc when compiling/linking gnome-ssh-askpass2 (closes: #555951).
  * Moved to; add Vcs-Bzr and Vcs-Browser control fields.
  * Add debian/README.source with instructions on bzr handling.
  * Make ChrootDirectory work with SELinux (thanks, Russell Coker; closes:
  * Initialise sc to NULL in ssh_selinux_getctxbyname (thanks, Václav Ovsík;
    closes: #498684).
  * Don't duplicate backslashes when displaying server banner (thanks,
    Michał Górny; closes: #505378, LP...


Changed in openssh (Ubuntu):
status: Fix Committed → Fix Released
Changed in openssh (Debian):
status: Unknown → Fix Released
Changed in openssh:
status: Unknown → Fix Released
Changed in gentoo:
status: Confirmed → Fix Released
Changed in gentoo:
importance: Unknown → Low
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