Advisory Details

April 11th, 2018

Microsoft Windows JScript defineProperty Use-After-Free Information Disclosure Vulnerability

CVE ID	CVE-2018-0987
CVSS SCORE	4.3, AV:N/AC:M/Au:N/C:P/I:N/A:N
AFFECTED VENDORS	Microsoft
AFFECTED PRODUCTS	Windows
VULNERABILITY DETAILS	This vulnerability allows remote attackers to disclose sensitive information on vulnerable installations of Microsoft Windows JScript. 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 defineProperty method. By performing actions in JScript, 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-2018-0987
DISCLOSURE TIMELINE	2018-03-08 - Vulnerability reported to vendor 2018-04-11 - Coordinated public release of advisory 2018-04-11 - Advisory Updated
CREDIT	Anonymous

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