Microsoft Windows VBScript InStr/InStrRev Functions Use-After-Free Information Disclosure Vulnerability
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 InStr and InStrRev functions. 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
