Advisory Details

July 10th, 2019

Microsoft Office Excel OLE Object Parsing Use-After-Free Remote Code Execution Vulnerability

ZDI-19-642
ZDI-CAN-7605

CVE ID CVE-2019-1111
CVSS SCORE 7.8, AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Office
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code 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 parsing of Excel objects when invoked through OLE by other Office applications. 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 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-2019-1111
DISCLOSURE TIMELINE
  • 2019-01-25 - Vulnerability reported to vendor
  • 2019-07-10 - Coordinated public release of advisory
CREDIT yingxinlei
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