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Zero Day Initiative Advisory 11-328

Zero Day Initiative Advisory 11-328
Posted Nov 12, 2011
Authored by Tipping Point | Site zerodayinitiative.com

Zero Day Initiative Advisory 11-328 - This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of the ProFTPd server. Authentication is required to exploit this vulnerability in order to have access to the ftp command set. The specific flaw exists within how the server manages the response pool that is used to send responses from the server to the client. When handling an exceptional condition the application will fail to restore the original response pointer which will allow there to be more than one reference to the response pointer. The next time it is used, a memory corruption can be made to occur which can allow for code execution under the context of the application.

tags | advisory, remote, arbitrary, code execution
SHA-256 | b042b6cfefe59bf1569e922d7012f959d2ae5e85844b6ddcc1fa014ac415dd41

Zero Day Initiative Advisory 11-328

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ZDI-11-328 : ProFTPD Response Pool Use-After-Free Remote Code
Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-11-328
November 11, 2011

- -- CVE ID:


- -- CVSS:
9, AV:N/AC:L/Au:S/C:C/I:C/A:C

- -- Affected Vendors:

ProFTPD



- -- Affected Products:

ProFTPD FTP Server



- -- Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of the ProFTPd server. Authentication is
required to exploit this vulnerability in order to have access to the
ftp command set.

The specific flaw exists within how the server manages the response pool
that is used to send responses from the server to the client. When
handling an exceptional condition the application will fail to restore
the original response pointer which will allow there to be more than one
reference to the response pointer. The next time it is used, a memory
corruption can be made to occur which can allow for code execution under
the context of the application.

- -- Vendor Response:

ProFTPD has issued an update to correct this vulnerability. More details
can be found at:

http://bugs.proftpd.org/show_bug.cgi?id=3711



- -- Disclosure Timeline:
2011-10-28 - Vulnerability reported to vendor
2011-11-11 - 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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