Advisory Details

December 8th, 2015

Microsoft Windows VBScript InStrB Function Use-After-Free Information Disclosure Vulnerability

ZDI-15-593
ZDI-CAN-3141

CVE ID CVE-2015-6136
CVSS SCORE 4.3, (AV:N/AC:M/Au:N/C:P/I:N/A:N)
AFFECTED VENDORS Microsoft
Microsoft
AFFECTED PRODUCTS Internet Explorer
Windows
TREND MICRO CUSTOMER PROTECTION Trend Micro TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 20814. For further product information on the TippingPoint IPS: http://www.tippingpoint.com
VULNERABILITY DETAILS


This vulnerability allows remote attackers to disclose the contents of memory on applications using the VBScript scripting language on vulnerable installations of Microsoft Windows. Microsoft Internet Explorer is an affected application. 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 implementation of the VBScript InStrB function. By supplying specially crafted parameters, an attacker can disclose the contents of memory. An attacker can use this information in conjunction with other vulnerabilities to execute code in the context of the process.

ADDITIONAL DETAILS Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://technet.microsoft.com/en-us/library/security/ms15-124.aspx
Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://technet.microsoft.com/en-us/library/security/ms15-124.aspx
DISCLOSURE TIMELINE
  • 2015-08-31 - Vulnerability reported to vendor
  • 2015-12-08 - Coordinated public release of advisory
CREDIT Simon Zuckerbraun - HP Zero Day Initiative
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