TippingPoint Zero Day Initiative
 

Microsoft Edge substringData Use-After-Free Information Disclosure Vulnerability

ZDI-17-842: October 10th, 2017

CVE ID

CVSS Score

Affected Vendors

Affected Products

    Edge

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 29687. For further product information on the TippingPoint IPS:

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.

Vendor Response

Microsoft has issued an update to correct this vulnerability. More details can be found at:

Disclosure Timeline

    2017-07-27 - Vulnerability reported to vendor
    2017-10-10 - Coordinated public release of advisory

Credit

This vulnerability was discovered by:
    Anonymous