Advisory Details

June 26th, 2018

Microsoft Office Excel Parsed Expression Uninitialized Memory Information Disclosure Vulnerability

CVE ID	CVE-2018-8246
CVSS SCORE	4.3, AV:N/AC:M/Au:N/C:P/I:N/A:N
AFFECTED VENDORS	Microsoft
AFFECTED PRODUCTS	Office Excel
VULNERABILITY DETAILS	This vulnerability allows remote attackers to disclose sensitive information on vulnerable installations of Microsoft Office 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 processing of parsed expressions in FORMULA records in Excel workbooks. Crafted data can trigger access to memory prior to initialization. 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-2018-8246
DISCLOSURE TIMELINE	2018-06-05 - Vulnerability reported to vendor 2018-06-26 - Coordinated public release of advisory 2018-06-26 - Advisory Updated
CREDIT	Pengsu Cheng of Trend Micro Security Research

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