Advisory Details

June 11th, 2019

Microsoft Word DOCX Parsing Use-After-Free Information Disclosure Vulnerability

ZDI-19-562
ZDI-CAN-8340

CVE ID CVE-2019-1034
CVSS SCORE 3.3, (AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N)
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Word
VULNERABILITY DETAILS

This vulnerability allows remote attackers to disclose sensitive information on vulnerable installations of Microsoft Word. 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 DOCX files. Crafted data in a DOCX file can cause a pointer to be reused after it has been freed. An attacker can leverage this in conjunction with other vulnerabilities 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-2019-1034
DISCLOSURE TIMELINE
  • 2019-04-03 - Vulnerability reported to vendor
  • 2019-06-11 - Coordinated public release of advisory
CREDIT Anonymous
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