Note: This bug is displayed in read-only format because the product is no longer active in Red Hat Bugzilla.

Bug 35978

Summary:	gssftp can be segfaulted remotely, possibly exploitable
Product:	[Retired] Red Hat Linux	Reporter:	Mario Lorenz <ml>
Component:	krb5	Assignee:	Nalin Dahyabhai <nalin>
Status:	CLOSED ERRATA	QA Contact:	Brian Brock <bbrock>
Severity:	medium	Docs Contact:
Priority:	high
Version:	7.0	CC:	msw
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	i386
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2001-05-15 15:49:19 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Mario Lorenz 2001-04-15 19:57:58 UTC

From Bugzilla Helper:
User-Agent: Mozilla/4.77 [de] (X11; U; Linux 2.2.19 i686)


kerberos-workstation includes kerberized ftp, gssftpd, which is not wu-ftpd
but the
BSD ftp. This FTP is possibly vulnerable to the GLOB attacks as described
in CERT
/Covert Labs Advisory recently. Also, plain "ls ~" gives you the FTP home
path, which
is considered bad (albeit highly predictable anyway on linux boxen)

Reproducible: Always
Steps to Reproduce:
1. Enable gssftp with chckconfig to allow kerberized FTP connections
2. Login to the ftp server using anonymous FTP
3. Type "cd ~*"
	

Actual Results:  421 service not available.
gdb attached to ftpd shows it segfaulted.


Expected Results:  Nothing

I am not 100% sure if this is exploitable, I didnt dig in that deep. Covert
Labs quote
exploitability under certain circumstances. Nevertheless, a remotely
induced segfault
is pretty bad.
Fortunately, the krb gssftp is probably not used widely.

Comment 1 Nalin Dahyabhai 2001-04-26 19:54:24 UTC

*** Bug 37731 has been marked as a duplicate of this bug. ***

Comment 2 Mario Lorenz 2001-05-15 15:33:00 UTC

Folks, you have had this for a whole month now.

A week after my initial report here, this came up on BugTraq and was labeled
REMOTE EXPLOITABLE. A fix was provided in the Bugtraq posting.

Since #37731 you knew the BugTraq post (and thats been 3 weeks ago as well)

It is therefore reasonable to state what seems obvious, and set the bug to
WONTFIX.

Comment 3 Matt Wilson 2001-05-15 15:44:51 UTC

*sigh*

Comment 4 Nalin Dahyabhai 2001-06-27 05:31:03 UTC

krb5-1.2.2-5 has been released as an errata.