__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Quiksoft EasyMail SMTP ActiveX Vulnerabilities [US-CERT Vulnerability Note VU#281977] August 31, 2007 14:00 GMT Number R-339 ______________________________________________________________________________ PROBLEM: The Quiksoft EasyMail SMTP ActiveX control contains multiple stack buffer overflow vulnerabilities, which could allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system. PLATFORM: Quiksoft EasyMail DAMAGE: Could allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system. SOLUTION: There is currently no practical solution to this problem. Please consider the workarounds in the bulletin below. ______________________________________________________________________________ VULNERABILITY The risk is MEDIUM. Could allow a remote, unauthenticated ASSESSMENT: attacker to execute arbitrary code on a vulnerable system. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/r-339.shtml ORIGINAL BULLETIN: http://www.kb.cert.org/vuls/id/281977 ______________________________________________________________________________ [***** Start US-CERT Vulnerability Note VU#281977 *****] Vulnerability Note VU#281977 Quiksoft EasyMail SMTP ActiveX control stack buffer overflow vulnerabilities Overview The Quiksoft EasyMail SMTP ActiveX control contains multiple stack buffer overflow vulnerabilities, which could allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system. I. Description Quiksoft EasyMail Objects is a set of ActiveX controls that provides email functionality, including SMTP, POP3, and IMAP4. The EasyMail SMTP ActiveX control, which is provided by emsmtp.dll, contains multiple stack buffer overflow vulnerabilities. This control is bundled with several applications, including Earthlink internet access software. Exploit code for this vulnerability is publicly available. II. Impact A remote, unauthenticated attacker may be able to execute arbitrary code on a vulnerable system with privileges of the user. III. Solution We are currently unaware of a practical solution to this problem. Please consider the following workarounds Disable the Quiksoft EasyMail ActiveX control in Internet Explorer The vulnerable ActiveX control can be disabled in Internet Explorer by setting the kill bit for the following CLSID: {68AC0D5F-0424-11D5-822F-00C04F6BA8D9} More information about how to set the kill bit is available in Microsoft Support Document 240797. Alternatively, the following text can be saved as a .REG file and imported to set the kill bit for this control: Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility \{68AC0D5F-0424-11D5-822F-00C04F6BA8D9}] "Compatibility Flags"=dword:00000400 Disable ActiveX Disabling ActiveX controls in the Internet Zone (or any zone used by an attacker) appears to prevent exploitation of this and other ActiveX vulnerabilities. Instructions for disabling ActiveX in the Internet Zone can be found in the "Securing Your Web Browser" document. Systems Affected Vendor Status Date Updated Earthlink Vulnerable 29-Aug-2007 Gate Comm Software Vulnerable 29-Aug-2007 Quiksoft Vulnerable 29-Aug-2007 References http://www.cert.org/tech_tips/securing_browser/#Internet_Explorer http://www.quicksoftcorp.com/objects/ http://www.quicksoftcorp.com/clients/whouses.asp Credit This vulnerability was reported by Will Dormann of the CERT/CC. The vulnerability was also independently discovered and publicly disclosed by rgod. This document was written by Will Dormann. Other Information Date Public 08/27/2007 Date First Published 08/29/2007 03:15:22 PM Date Last Updated 08/30/2007 CERT Advisory CVE Name Metric 25.82 Document Revision 5 [***** End US-CERT Vulnerability Note VU#281977 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of US-CERT for the information contained in this bulletin. _______________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. CIAC is also a founding member of FIRST, the Forum of Incident Response and Security Teams, a global organization established to foster cooperation and coordination among computer security teams worldwide. CIAC services are available to DOE, DOE contractors, and the NIH. CIAC can be contacted at: Voice: +1 925-422-8193 (7x24) FAX: +1 925-423-8002 STU-III: +1 925-423-2604 E-mail: ciac@ciac.org Previous CIAC notices, anti-virus software, and other information are available from the CIAC Computer Security Archive. World Wide Web: http://www.ciac.org/ Anonymous FTP: ftp.ciac.org PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing communities receive CIAC bulletins. If you are not part of these communities, please contact your agency's response team to report incidents. Your agency's team will coordinate with CIAC. The Forum of Incident Response and Security Teams (FIRST) is a world-wide organization. A list of FIRST member organizations and their constituencies can be obtained via WWW at http://www.first.org/. This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation or favoring by the United States Government or the University of California. 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