Advisory Details

July 23rd, 2020

Microsoft Windows LNK File Parsing Type Confusion Remote Code Execution Vulnerability

ZDI-20-923
ZDI-CAN-10895

CVE ID CVE-2020-1421
CVSS SCORE 8.8, (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Windows
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Microsoft Windows. 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 LNK files in StructuredQuery.dll. A crafted LeafCondition element can trigger a type confusion condition. 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-2020-1421
DISCLOSURE TIMELINE
  • 2020-05-07 - Vulnerability reported to vendor
  • 2020-07-23 - Coordinated public release of advisory
CREDIT @expend20
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