Bug 35978 - gssftp can be segfaulted remotely, possibly exploitable
gssftp can be segfaulted remotely, possibly exploitable
Product: Red Hat Linux
Classification: Retired
Component: krb5 (Show other bugs)
i386 Linux
high Severity medium
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Assigned To: Nalin Dahyabhai
Brian Brock
: Security
: 37731 (view as bug list)
Depends On:
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Reported: 2001-04-15 15:57 EDT by Mario Lorenz
Modified: 2007-03-26 23:43 EDT (History)
1 user (show)

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2001-05-15 11:49:19 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Mario Lorenz 2001-04-15 15:57:58 EDT
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
/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 15:54:24 EDT
*** Bug 37731 has been marked as a duplicate of this bug. ***
Comment 2 Mario Lorenz 2001-05-15 11:33:00 EDT
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

Comment 3 Matt Wilson 2001-05-15 11:44:51 EDT
Comment 4 Nalin Dahyabhai 2001-06-27 01:31:03 EDT
krb5-1.2.2-5 has been released as an errata.

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