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ZDI-10-229: ProFTPD TELNET_IAC Remote Code Execution Vulnerability
From: ZDI Disclosures <zdi-disclosures () tippingpoint com>
Date: Sun, 7 Nov 2010 11:01:01 -0600

ZDI-10-229: ProFTPD TELNET_IAC Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-10-229

November 2, 2010

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

-- Affected Vendors:
ProFTPD

-- Affected Products:
ProFTPD FTP Server

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 10641.
For further product information on the TippingPoint IPS, visit:

    http://www.tippingpoint.com

-- 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 process.

-- Vendor Response:
ProFTPD states:
Patch committed to CVS with accompanying regression test, and backported
to
1.3.3 branch.
http://bugs.proftpd.org/show_bug.cgi?id=3521

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

-- Credit:
This vulnerability was discovered by:
    * Anonymous

-- About the Zero Day Initiative (ZDI):
Established by TippingPoint, The Zero Day Initiative (ZDI) represents
a best-of-breed model for rewarding security researchers for responsibly
disclosing discovered vulnerabilities.

Researchers interested in getting paid for their security research
through the ZDI can find more information and sign-up at:

    http://www.zerodayinitiative.com

The ZDI is unique in how the acquired vulnerability information is
used. TippingPoint does not re-sell the vulnerability details or any
exploit code. Instead, upon notifying the affected product vendor,
TippingPoint provides its customers with zero day protection through
its intrusion prevention technology. Explicit details regarding the
specifics of the vulnerability are not exposed to any parties until
an official vendor patch is publicly available. Furthermore, with the
altruistic aim of helping to secure a broader user base, TippingPoint
provides this vulnerability information confidentially to security
vendors (including competitors) who have a vulnerability protection or
mitigation product.

Our vulnerability disclosure policy is available online at:

    http://www.zerodayinitiative.com/advisories/disclosure_policy/

Follow the ZDI on Twitter:

    http://twitter.com/thezdi


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