Microsoft JScript and VBScript Multiple Vulnerabilities

Last Update Date: 14 Oct 2015 10:21 Release Date: 14 Oct 2015 3209 Views

RISK: Medium Risk

TYPE: Operating Systems - Windows OS

Multiple Scripting Engine Memory Corruption Vulnerabilities
Remote code execution vulnerabilities exist in the way that the VBScript and JScript engines, when handling objects in memory in Internet Explorer, render. In a web-based attack scenario, an attacker could host a specially crafted website that is designed to exploit the vulnerabilities through Internet Explorer and then convince a user to view the website. An attacker could also embed an ActiveX control marked "safe for initialization" in an application or Microsoft Office document that hosts the IE rendering engine. The attacker could also take advantage of compromised websites, and websites that accept or host user-provided content or advertisements. These websites could contain specially crafted content that could exploit the vulnerabilities.
VBScript and JScript ASLR Bypass
A security feature bypass exists when the VBScript and JScript engines fail to use the Address Space Layout Randomization (ASLR) security feature, allowing an attacker to more reliably predict the memory offsets of specific instructions in a given call stack. The security feature bypass by itself does not allow arbitrary code execution. However, an attacker could use the ASLR bypass in conjunction with another vulnerability, such as a remote code execution vulnerability, that could take advantage of the ASLR bypass to more reliably run arbitrary code on a target system.
Scripting Engine Information Disclosure Vulnerability
An information disclosure vulnerability exists when JScript or VBScript improperly discloses the contents of its memory, which could provide an attacker with information to further compromise the user's computer or data.