Advisory Details

April 15th, 2020

Microsoft Excel XLSM File Use-After-Free Information Disclosure Vulnerability

ZDI-20-469
ZDI-CAN-10140

CVE ID CVE-2020-0906
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 Excel
VULNERABILITY DETAILS

This vulnerability allows remote attackers to disclose sensitive information on affected 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 handling of OLE streams in XLSM files. Crafted data in an XLSM 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 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-2020-0906
DISCLOSURE TIMELINE
  • 2020-02-10 - Vulnerability reported to vendor
  • 2020-04-15 - Coordinated public release of advisory
CREDIT Zhihua Yao and Dexter Li
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