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Category:   Application (Security)  >   Kerberos Vendors:   MIT
Kerberos telnetd Grants Access to Remote Users
SecurityTracker Alert ID:  1017848
SecurityTracker URL:  http://securitytracker.com/id/1017848
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:   The vendor has issued a patch, available at:

http://web.mit.edu/kerberos/advisories/2007-001-patch.txt

The pending krb5-1.6.1 release will include the fix.

The MIT advisory is available at:

http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2007-001-telnetd.txt

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

Message History:   This archive entry has one or more follow-up message(s) listed below.
Apr 3 2007 (Red Hat Issues Fix) Kerberos telnetd Grants Access to Remote Users
Red Hat has released a fix for Red Hat Enterprise Linux 2.1, 3, 4, and 5.
Apr 3 2007 (IBM Issues Fix for AIX) Kerberos telnetd Grants Access to Remote Users
IBM has issued a fix for Network Authentication Service on IBM AIX 5.2 and 5.3.
Apr 4 2007 (Sun Describes Workaround) Kerberos telnetd Grants Access to Remote Users
Sun has described a workaround for the SEAM telnet daemon.



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