Advisory Details

December 6th, 2017

Microsoft Office Excel XLS File Parsing Use-After-Free Remote Code Execution Vulnerability

CVE ID	CVE-2017-11884
CVSS SCORE	6.8, AV:N/AC:M/Au:N/C:P/I:P/A:P
AFFECTED VENDORS	Microsoft
AFFECTED PRODUCTS	Office Excel
VULNERABILITY DETAILS	This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft Excel. 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 parsing of XLS files. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to execute under 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-2017-11884
DISCLOSURE TIMELINE	2017-11-07 - Vulnerability reported to vendor 2017-12-06 - Coordinated public release of advisory
CREDIT	Dmitri Kaslov

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