1) Improper input validation

Severity: Critical

CVSSv3: 8.9 [CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:F/RL:O/RC:C] [PCI]

CVE-ID: CVE-2014-4148

CWE-ID: CWE-20 - Improper Input Validation

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to improper input validation when processing TrueType fonts in kernel-mode driver (win32k.sys). A remote attacker can create a specially crafted font file, place it on a web page, trick the victim into visiting it, trigger memory corruption and execute arbitrary code with privileges of the current user.

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

Note: the vulnerability was being actively exploited.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Windows Server: 2003, 2008, 2008 R2, 2012, 2012 R2

Windows: 7, 8, 8.1, RT, RT 8.1, Vista

CPE

• cpe:/o:microsoft:windows_server:2003:
• cpe:/o:microsoft:windows_server:2008_r2:
• cpe:/o:microsoft:windows_server:2008:
• cpe:/o:microsoft:windows_server:2012_r2:
• cpe:/o:microsoft:windows_server:2012:
• cpe:/o:microsoft:windows:rt_8.1:
• cpe:/o:microsoft:windows:rt:
• cpe:/o:microsoft:windows:8:
• cpe:/o:microsoft:windows:7:
• cpe:/o:microsoft:windows:vista:
• cpe:/o:microsoft:windows:8.1:

External links

https://technet.microsoft.com/en-us/library/security/ms14-058

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.