1) Path traversal

Risk: 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-2015-0016

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to gain elevated privileges on the target system.

The weakness exists due to insufficient validation of user-supplied input within TS WebProxy Windows component. A remote attacker can trick the victim into downloading a specially crafted file and execute it with privileges of the current user.  

Successful exploitation of the vulnerability may result in full control of the vulnerable system.

Note: the vulnerability was being actively exploited.

Mitigation

Install update from vendor's website.

Vulnerable software versions

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

Windows Server: 2008 R2, 2012, 2012 R2

CPE

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

External links

https://technet.microsoft.com/en-us/library/security/ms15-004

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.