Advisory Details

June 11th, 2015

Microsoft Internet Explorer Add-On Installer EPM Sandbox Escape Vulnerability

ZDI-15-249
ZDI-CAN-2796

CVE ID CVE-2015-1739
CVSS SCORE 6.9, (AV:L/AC:M/Au:N/C:C/I:C/A:C)
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Internet Explorer
VULNERABILITY DETAILS


This vulnerability allows attackers to escape the Extended Protection Mode sandbox of vulnerable installations of Microsoft Internet Explorer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the actions of the IE add-on installer. The installer can take a web page created by attacker code running in the context of the IE App Container and copy it to a location where it can be rendered as an Intranet webpage, which, by default, invokes IE as a medium-integrity process in the context of the user.

ADDITIONAL DETAILS Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://technet.microsoft.com/library/security/MS15-056
DISCLOSURE TIMELINE
  • 2015-03-05 - Vulnerability reported to vendor
  • 2015-06-11 - Coordinated public release of advisory
CREDIT Thomas Vanhoutte
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