Secunia Research: Internet Explorer 7 "onunload" Event SpoofingVulnerability

2007.02.27
Risk: Medium
Local: No
Remote: Yes
CWE: N/A


CVSS Base Score: 6.8/10
Impact Subscore: 6.4/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

====================================================================== Secunia Research 23/02/2007 - Internet Explorer 7 "onunload" Event Spoofing Vulnerability - ====================================================================== Table of Contents Affected Software....................................................1 Severity.............................................................2 Vendor's Description of Software.....................................3 Description of Vulnerability.........................................4 Solution.............................................................5 Time Table...........................................................6 Credits..............................................................7 References...........................................................8 About Secunia........................................................9 Verification........................................................10 ====================================================================== 1) Affected Software The vulnerability is confirmed in Microsoft Internet Explorer 7. ====================================================================== 2) Severity Rating: Less critical Impact: Spoofing Where: Remote ====================================================================== 3) Vendor's Description of Software Internet Explorer 7 provides improved navigation through tabbed browsing, web search right from the toolbar, advanced printing, easy discovery, reading and subscription to RSS feeds, and much more. http://www.microsoft.com/windows/products/winfamily/ie/default.mspx ====================================================================== 4) Description of Vulnerability Secunia Research has discovered a vulnerability in Internet Explorer 7, which can be exploited by a malicious website to spoof the address bar. The vulnerability is caused due to an error in Internet Explorer 7's handling of "onunload" events, enabling a malicious website to abort the loading of a new website. This can be exploited to spoof the address bar if e.g. the user enters a new website manually in the address bar, which is commonly exercised as best practice. The vulnerability is confirmed on a fully patched Windows XP SP2 system running Internet Explorer 7. Other versions may also be affected. ====================================================================== 5) Solution Close all browser windows after visiting untrusted websites. ====================================================================== 6) Time Table 05/01/2007 - Vendor notified and responded. 16/02/2007 - Further communication with vendor. 23/02/2007 - Public disclosure due to dislosure by third party. ====================================================================== 7) Credits Discovered by Jakob Balle, Secunia Research. ====================================================================== 8) References No references available. ====================================================================== 9) About Secunia Secunia offers vulnerability management solutions to corporate customers with verified and reliable vulnerability intelligence relevant to their specific system configuration: http://corporate.secunia.com/ Secunia also provides a publicly accessible and comprehensive advisory database as a service to the security community and private individuals, who are interested in or concerned about IT-security. http://secunia.com/ Secunia believes that it is important to support the community and to do active vulnerability research in order to aid improving the security and reliability of software in general: http://corporate.secunia.com/secunia_research/33/ Secunia regularly hires new skilled team members. Check the URL below to see currently vacant positions: http://secunia.com/secunia_vacancies/ Secunia offers a FREE mailing list called Secunia Security Advisories: http://secunia.com/secunia_security_advisories/ ====================================================================== 10) Verification Please verify this advisory by visiting the Secunia website: http://secunia.com/secunia_research/2007-1/ Complete list of vulnerability reports published by Secunia Research: http://secunia.com/secunia_research/ ======================================================================


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