Advisory Details

July 14th, 2015

(Pwn2Own) Microsoft Windows Installer Local Elevation of Privilege Vulnerability

CVE ID	CVE-2015-2371
CVSS SCORE	6.8, AV:L/AC:L/Au:S/C:C/I:C/A:C
AFFECTED VENDORS	Microsoft
AFFECTED PRODUCTS	Windows
VULNERABILITY DETAILS	This vulnerability allows local attackers to execute arbitrary code as SYSTEM on vulnerable installations of Microsoft Windows. An attacker must be logged in as a user on the system in order to execute the attack. The specific flaw exists within the behavior of some MSI installations. Some installations will launch an executable as SYSTEM during uninstallation or repair. The location of this executable is read from a registry key controllable by an unprivileged user, and because a repair operation does not require elevation, a standard user can use this functionality to execute arbitrary code as SYSTEM.
ADDITIONAL DETAILS	Microsoft has issued an update to correct this vulnerability. More details can be found at: https://technet.microsoft.com/en-us/library/security/MS15-074
DISCLOSURE TIMELINE	2015-03-18 - Vulnerability reported to vendor 2015-07-14 - Coordinated public release of advisory
CREDIT	Mariusz Mlynski

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