Advisory Details

May 10th, 2017

(Pwn2Own) Microsoft Edge WriteClassesOfCategory DLL Planting Sandbox Escape Vulnerability

CVE ID	CVE-2017-0233
CVSS SCORE	7.2, AV:L/AC:L/Au:N/C:C/I:C/A:C
AFFECTED VENDORS	Microsoft
AFFECTED PRODUCTS	Edge
VULNERABILITY DETAILS	This vulnerability allows remote attackers to escape the AppContainer sandbox 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 implementation of the IBrowserBroker::WriteClassesOfCategory method. Executing this method can cause the broker process to load a module from an unqualified path. An attacker can leverage this in conjunction with other vulnerabilities to execute code under the context of the user at medium integrity.
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-2017-0233
DISCLOSURE TIMELINE	2017-03-15 - Vulnerability reported to vendor 2017-05-10 - Coordinated public release of advisory 2018-03-06 - Advisory Updated
CREDIT	Tencent Security Team Ether

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