Advisory Details

August 8th, 2017

Microsoft Edge XAML File Improper Access Control Privilege Escalation Vulnerability

ZDI-17-637
ZDI-CAN-4461

CVE ID CVE-2017-8503
CVSS SCORE 3.7, (AV:L/AC:H/Au:N/C:P/I:P/A:P)
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Edge
VULNERABILITY DETAILS


This vulnerability allows remote attackers to escalate privileges on vulnerable installations of Microsoft Edge. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within the handling of XAML files. When an XAML file is downloaded, Microsoft Edge does not set appropriate file permissions. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the current user at medium integrity.

VENDOR RESPONSE Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8503
DISCLOSURE TIMELINE
  • 2017-02-01 - Vulnerability reported to vendor
  • 2017-08-08 - Coordinated public release of advisory
CREDIT Thomas Vanhoutte
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