Slackware: 'openssh' Unauthorized access vulnerability
Posted by LinuxSecurity.com Team   
Slackware Joost Pol discoverd an off-by-one bug in OpenSSH's channel code that can allow a local attacker to obtain root privileges.

Date: Thu, 7 Mar 2002 16:51:31 -0800 (PST)
From: Slackware Security Team <security@slackware.com>
To: slackware-security@slackware.com
Subject: [slackware-security] OpenSSH security problem fixed


New openssh packages are available to fix security problems.

Here's the information from the Slackware 8.0 ChangeLog:

----------------------------
Thu Mar  7 12:00:18 PST 2002
patches/packages/openssh.tgz:  Upgraded to openssh-3.1p1.

  This fixes a security problem in the openssh package.  All sites running
  OpenSSH should upgrade immediately.

  All versions of OpenSSH between 2.0 and 3.0.2 contain an off-by-one error
  in the channel code.  OpenSSH 3.1 and later are not affected.  This bug can
  be exploited locally by an authenticated user logging into a vulnerable
  OpenSSH server or by a malicious SSH server attacking a vulnerable OpenSSH
  client.  This bug was discovered by Joost Pol <joost@pine.nl>

(* Security fix *)
----------------------------


WHERE TO FIND THE NEW PACKAGE:
------------------------------
Updated openssh package for Slackware 8.0: 
ftp://ftp.slackware.com/pub/slackware/slackware-8.0/patches/packages/openssh.tgz

Updated openssh package for Slackware -current: 
ftp://ftp.slackware.com/pub/slackware/slackware-current/openssh-3.1p1/packages/openssh-3.1p1-i386-1.tgz


MD5 SIGNATURE:
--------------

Here is the md5sum for the package:

Slackware 8.0:
1db0be2661cc1640aaa5797f9eb366db  openssh.tgz

Slackware -current:
d7686a09c398a76b0d0638c8dae615ef  openssh-3.1p1-i386-1.tgz


INSTALLATION INSTRUCTIONS:
--------------------------

First, stop sshd:
# /etc/rc.d/rc.sshd stop

Next, upgrade to the new openssh.tgz package:
# upgradepkg openssh.tgz

Finally, restart sshd:
# /etc/rc.d/rc.sshd start


Remember, it's also a good idea to backup configuration files before
upgrading packages.

- Slackware Linux Security Team
   http://www.slackware.com