Advisory Details

October 10th, 2018

Microsoft Internet Explorer WebCrypto importKey Use-After-Free Information Disclosure Vulnerability

CVE ID	CVE-2018-8491
CVSS SCORE	5.0, AV:N/AC:L/Au:N/C:P/I:N/A:N
AFFECTED VENDORS	Microsoft
AFFECTED PRODUCTS	Internet Explorer
VULNERABILITY DETAILS	This vulnerability allows remote attackers to disclose sensitive information on vulnerable installations of Microsoft Internet Explorer. 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 processing of imported keys in WebCrypto. By performing actions in JavaScript, 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 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-2018-8491
DISCLOSURE TIMELINE	2018-06-28 - Vulnerability reported to vendor 2018-10-10 - Coordinated public release of advisory 2018-10-10 - Advisory Updated
CREDIT	Simon Zuckerbraun of Trend Micro Zero Day Initiative

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