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Category:   Application (Security)  >   Kerberos Vendors:   MIT
(IBM Issues Fix for AIX) Kerberos telnetd Grants Access to Remote Users
SecurityTracker Alert ID:  1017861
SecurityTracker URL:  http://securitytracker.com/id/1017861
CVE Reference:   CVE-2007-0956   (Links to External Site)
Date:  Apr 3 2007
Impact:   Root access via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): krb5 prior to krb5-1.6.1
Description:   A vulnerability was reported in Kerberos in the telnet daemon. A remote user can bypass authentication and gain access to the target system.

A remote user can invoke telnet and set a specially crafted username that begins with '-e' to gain remote access to the specified username account on the target system.

Impact:   A remote user can gain access to the target system.
Solution:   IBM has issued the following fixes.

For AIX 5.2.0: Install Network Authentication Service version 1.4.0.6 or 1.3.0.6.

For AIX 5.3.0: Install Network Authentication Service version 1.3.0.6 or 1.4.0.6. Version 1.4.0.6 will available on the AIX 5L for POWER V5.3 Expansion Pack in November 2007.

Vendor URL:  web.mit.edu/kerberos/advisories/MITKRB5-SA-2007-001-telnetd.txt (Links to External Site)
Cause:   Authentication error, State error
Underlying OS:  UNIX (AIX)
Underlying OS Comments:  5.2, 5.3

Message History:   This archive entry is a follow-up to the message listed below.
Apr 3 2007 Kerberos telnetd Grants Access to Remote Users



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