Date:         Wed, 14 Jun 2000 18:36:03 -0400
From: Tom Yu <tlyu@MIT.EDU>
Subject:      Security Advisory: REMOTE ROOT VULNERABILITY IN GSSFTP DAEMON
To: BUGTRAQ@SECURITYFOCUS.COM

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	      REMOTE ROOT VULNERABILITY IN GSSFTP DAEMON

2000-06-14

SUMMARY:

A remote user may execute certain FTP commands without authorization.

IMPACT:

A remote user may perform denial of service attacks.

An attacker with access to a local account may gain unauthorized root
access.

VULNERABLE DISTRIBUTIONS:

Source distributions which may contain vulnerable code include:

	MIT Kerberos 5 releases krb5-1.1 and krb5-1.1.1

The beta releases krb5-1.1.2-beta1 and krb5-1.2-beta2 are also
vulnerable.

NON-VULNERABLE DISTRIBUTIONS:

	MIT Kerberos 5 releases krb5-1.0.x

FIXES:

If you are running a vulnerable FTP daemon, disable it immediately,
usually by commenting it out of your inetd.conf and sending a SIGHUP
to the inetd process.

To correct the bug, apply the following patch, rebuild, and reinstall
ftpd on the affected machines.

The upcoming krb5-1.2 release will correct this problem.  There will
be a krb5-1.2-beta3 release later this week that will correct this
problem.

PATCHES:

These patches will apply against krb5-1.1.1, krb5-1.1.2-beta1, and
krb5-1.2-beta2.  They will be made available on the web site at:

	http://web.mit.edu/kerberos/www/advisories/ftpd_111_patch.txt

The MIT Kerberos security advisories page is at:

	http://web.mit.edu/kerberos/www/advisories/index.html

Patches for other security problems as well as archives of security
advisory postings are located on that page.

Index: ftpcmd.y
===================================================================
RCS file: /cvs/krbdev/krb5/src/appl/gssftp/ftpd/ftpcmd.y,v
retrieving revision 1.14
diff -c -r1.14 ftpcmd.y
*** ftpcmd.y	1999/03/24 22:14:02	1.14
- --- ftpcmd.y	2000/06/14 17:35:19
***************
*** 865,871 ****
  			$$ = 0;
  		}
  		else
! 			$$ = 1;
  	}
  	;
  %%
- --- 865,871 ----
  			$$ = 0;
  		}
  		else
! 			$$ = $1;
  	}
  	;
  %%

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