1) Improper input validation

Risk: Critical

CVSSv3: 9.5 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C] [PCI]

CVE-ID: CVE-2017-8759

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: Yes

Description

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

The vulnerability exists due to uncpecified error when processing untrusted input. A remote unauthenticated attacker can execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Note: this vulnerability is being actively exploited in the wild.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Microsoft .NET Framework: 2.0, 3.5, 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.6.2/4.7/4.7.1, 4.7

CPE

• cpe:/a:microsoft:microsoft_net_framework:4.5.2:
• cpe:/a:microsoft:microsoft_net_framework:4.6:
• cpe:/a:microsoft:microsoft_net_framework:3.5.1:
• cpe:/a:microsoft:microsoft_net_framework:4.6.1:
• cpe:/a:microsoft:microsoft_net_framework:3.5:
• cpe:/a:microsoft:microsoft_net_framework:2.0:
• cpe:/a:microsoft:microsoft_net_framework:4.6.2:
• cpe:/a:microsoft:microsoft_net_framework:4.7:
• cpe:/a:microsoft:microsoft_net_framework:4.6.2/4.7/4.7.1:

External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8759

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?

Yes. This vulnerability is being exploited in the wild.