Home page logo

fulldisclosure logo Full Disclosure mailing list archives

ZDI-11-021: Icon Labs Iconfidant SSL Server Key Length Remote Code Execution Vulnerability
From: ZDI Disclosures <zdi-disclosures () tippingpoint com>
Date: Thu, 20 Jan 2011 12:16:42 -0600

ZDI-11-021: Icon Labs Iconfidant SSL Server Key Length Remote Code Execution Vulnerability


January 20, 2011

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

-- Affected Vendors:
Icon Labs

-- Affected Products:
Icon Labs Iconfidant SSL

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 8034.
For further product information on the TippingPoint IPS, visit:


-- Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of Icon Labs Iconfidant SSL Server.
Authentication is not required to exploit this vulnerability.

The specific flaw exists in the functionality responsible for key
exchange. If the sum of specific length fields within a client master
key packet exceeds 0x4000, a static buffer can be overflowed leading to
arbitrary code execution on the affected system.

-- Vendor Response:
Icon Labs states that this issue was first fixed in Iconfidant SSL 1.3.0
and recommends upgrading to Iconfidant 1.3.1.  Please contact Icon Labs
at support () icon-labs com to update the latest Iconfidant SSL software.
"Icon Labs would like to thank an Anonymous researcher and
TippingPoint's Zero Day Initiative for responsibly reporting this
vulnerability, ZDI-CAN-403."

-- Disclosure Timeline:
2008-10-28 - Vulnerability reported to vendor
2011-01-20 - 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:


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:


Follow the ZDI on Twitter:


Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/

  By Date           By Thread  

Current thread:
  • ZDI-11-021: Icon Labs Iconfidant SSL Server Key Length Remote Code Execution Vulnerability ZDI Disclosures (Jan 20)
[ Nmap | Sec Tools | Mailing Lists | Site News | About/Contact | Advertising | Privacy ]