Multiple privilege escalation vulnerabilities in Win32k.sys in Microsoft Windows

Published: 2010-10-12 19:44:31 | Updated: 2017-01-31 05:44:16
Severity Medium
Patch available YES
Number of vulnerabilities 3
CVSSv2 5.3 (AV:L/AC:L/Au:N/C:C/I:C/A:C/E:U/RL:OF/RC:C)
5.3 (AV:L/AC:L/Au:N/C:C/I:C/A:C/E:U/RL:OF/RC:C)
6 (AV:L/AC:L/Au:N/C:C/I:C/A:C/E:F/RL:OF/RC:C)
CVSSv3 7.5 [CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]
7.5 [CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]
8 [CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:F/RL:O/RC:C]
CVE ID CVE-2010-2744
CVE-2010-2549
CVE-2010-2743
CWE ID CWE-20
CWE-911
CWE-129
Exploitation vector Local
Public exploit Vulnerability #3 is being exploited in the wild.
Vulnerable software Windows
Windows Server
Vulnerable software versions Windows XP
Windows Vista
Windows 7
Windows Server 2003
Windows Server 2008
Windows Server 2008 R2
Vendor URL Microsoft
Advisory type Public

Security Advisory

1) Improper input validation

Description

The vulnerability allows a local user to execute arbitrary code with elevated privileges.

The vulnerability exists due to an error in Win32k.sys driver when validating window class data. A local user can execute arbitrary code on the target system with SYSTEM privileges.

Successful exploitation of this vulnerability may allow an attacker to escalate privileges on vulnerable system.

Remediation

Install updates from vendor's website.

External links

https://technet.microsoft.com/en-us/library/security/ms10-073.aspx

2) Reference count error

Description

The vulnerability allows a local user to execute arbitrary code with elevated privileges.

The vulnerability exists due to an error in Win32k.sys driver when updating reference count for an object. A local user can execute arbitrary code on the target system with SYSTEM privileges.

Successful exploitation of this vulnerability may allow an attacker to escalate privileges on vulnerable system.

Remediation

Install updates from vendor's website.

External links

https://technet.microsoft.com/en-us/library/security/ms10-073.aspx

3) Improper validation of array index

Description

The vulnerability allows a local user to execute arbitrary code with elevated privileges.

The vulnerability exists due to an error in Win32k.sys driver when handling keyboard layouts as the Windows kernel fails to validate that an array index is within the bounds of the array. A local user can load a specially crafted keyboard layout and execute arbitrary code on the target system with privileges of SYSTEM account.

Successful exploitation of this vulnerability may allow an attacker to escalate privileges on vulnerable system.

Note: this vulnerability is being actively exploited by Stuxnet.

Remediation

Install updates from vendor's website.

External links

https://technet.microsoft.com/en-us/library/security/ms10-073.aspx
https://www.us-cert.gov/ncas/alerts/TA10-285A

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