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Category:   Application (Security)  >   Kerberos Vendors:   MIT
(Sun Describes Workaround) Kerberos telnetd Grants Access to Remote Users
SecurityTracker Alert ID:  1017868
SecurityTracker URL:
CVE Reference:   CVE-2007-0956   (Links to External Site)
Date:  Apr 4 2007
Impact:   Root access via network, User access via network
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:   Sun has described a workaround for the Sun Enterprise Authentication Mechanism (SEAM) 1.0 kerberized telnet daemon, available in their advisory.

Sun is working on a fix.

The Sun advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Authentication error, State error
Underlying OS:  UNIX (Solaris - SunOS)
Underlying OS Comments:  8, 9

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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