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             AUSCERT External Security Bulletin Redistribution

          ProFTPD TELNET_IAC Remote Code Execution Vulnerability
                              3 November 2010


        AusCERT Security Bulletin Summary

Product:           ProFTPD
Publisher:         Zero Day Initiative
Operating System:  UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution:        Patch/Upgrade

Original Bulletin: 

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ProFTPD TELNET_IAC Remote Code Execution Vulnerability
ZDI-10-229: November 2nd, 2010
CVSS Score

      10, (AV:N/AC:L/Au:N/C:C/I:C/A:C) 

Affected Vendors


Affected Products

      FTP Server

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on 
vulnerable installations of ProFTPD. Authentication is not required to exploit 
this vulnerability.

The flaw exists within the proftpd server component which listens by default 
on TCP port 21. When reading user input if a TELNET_IAC escape sequence is 
encountered the process miscalculates a buffer length counter value allowing a 
user controlled copy of data to a stack buffer. A remote attacker can exploit 
this vulnerability to execute arbitrary code under the context of the proftpd 

Vendor Response
ProFTPD states:

Patch committed to CVS with accompanying regression test, and backported to
1.3.3 branch.

Disclosure Timeline

      2010-09-24 - Vulnerability reported to vendor
      2010-11-02 - Coordinated public release of advisory

This vulnerability was discovered by:


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