Advisory Details

October 10th, 2017

Microsoft Edge substringData Use-After-Free Information Disclosure Vulnerability

ZDI-17-842
ZDI-CAN-5059

CVE ID CVE-2017-11794
CVSS SCORE 4.3, (AV:N/AC:M/Au:N/C:P/I:N/A:N)
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Edge
TREND MICRO CUSTOMER PROTECTION Trend Micro TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 29687. For further product information on the TippingPoint IPS: http://www.tippingpoint.com
VULNERABILITY DETAILS


This vulnerability allows remote attackers to disclose sensitive information on vulnerable installations of Microsoft Edge. 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 handling of the substringData DOM method. By manipulating a document's elements an attacker can cause a pointer to be reused after it has been freed. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the current process.

ADDITIONAL DETAILS 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-2017-11794
DISCLOSURE TIMELINE
  • 2017-07-27 - Vulnerability reported to vendor
  • 2017-10-10 - Coordinated public release of advisory
CREDIT Anonymous
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