Privilege escalation in Microsoft Windows and Windows Server - CVE-2013-3660

Vulnerability identifier: #VU4790

CSH Severity: Medium

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2013-3660

CWE-ID: CWE-119

Exploitation vector: Local access

Exploit availability: The vulnerability is being exploited in the wild

The vulnerability allows a local attacker to obtain elevated privileges on the target system.

The weakness exists due to the failure to properly initialize a pointer for the next object in a certain list by the EPATHOBJ::pprFlattenRec function within kernel-mode driver (win32k.sys). A local attacker can use multiple FlattenPath function calls to obtain write access to the PATHRECORD chain and execute arbitrary code on the system with elevated privileges.

Successful exploitation of the vulnerability results in arbitrary code execution on the vulnerable system.

Note: the vulnerability was being actively exploited.

Microsoft Windows
Windows Server

Install update from vendor's website.

• Exploit #796 - Microsoft Windows - 'EPATHOBJ::pprFlattenRec' Privilege Escalation (Metasploit) (March 18, 2020)
• Exploit #797 - Microsoft Windows NT/2000/2003/2008/XP/Vista/7/8 - Local Ring Exploit (EPATHOBJ) (March 18, 2020)
• Exploit #798 - Microsoft Windows - Win32k!EPATHOBJ::pprFlattenRec Uninitialized Next Pointer Testcase (March 18, 2020)
• Exploit #1603 - Windows EPATHOBJ::pprFlattenRec Local Privilege Escalation (March 18, 2020)

• https://technet.microsoft.com/en-us/library/security/ms13-053

• Privilege escalation in Microsoft Windows