Advisory Details

May 10th, 2017

(Pwn2Own) Microsoft Edge AudioBuffer Use-After-Free Information Disclosure Vulnerability

CVE ID	CVE-2017-0240
CVSS SCORE	4.3, AV:N/AC:M/Au:N/C:P/I:N/A:N
AFFECTED VENDORS	Microsoft
AFFECTED PRODUCTS	Edge
VULNERABILITY DETAILS	This vulnerability allows remote attackers to disclose sensitive information on vulnerable installations of Microsoft Edge. 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 handling of AudioBuffer objects. 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 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-2017-0240
DISCLOSURE TIMELINE	2017-03-15 - Vulnerability reported to vendor 2017-05-10 - Coordinated public release of advisory
CREDIT	Richard Zhu (fluorescence)

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