Advisory Details

September 16th, 2021

Microsoft Visual Studio Incorrect Permission Assignment Privilege Escalation Vulnerability

CVE ID	CVE-2021-26434
CVSS SCORE	7.3, AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
AFFECTED VENDORS	Microsoft
AFFECTED PRODUCTS	Visual Studio
VULNERABILITY DETAILS	This vulnerability allows local attackers to escalate privileges on affected installations of Microsoft Visual Studio. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the Visual Studio installer. The issue results from incorrect permissions set on a resource used by the installer. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM.
ADDITIONAL DETAILS	Microsoft has issued an update to correct this vulnerability. More details can be found at: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26434
DISCLOSURE TIMELINE	2021-07-13 - Vulnerability reported to vendor 2021-09-16 - Coordinated public release of advisory
CREDIT	Michael DePlante (@izobashi) of Trend Micro's Zero Day Initiative

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