Multiple vulnerabilities in Microsoft .NET Framework

Published: 2018-01-09

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2018-0786 CVE-2018-0764
CWE-ID	CWE-20 CWE-611
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Microsoft .NET Framework Server applications / Frameworks for developing and running applications
Vendor	Microsoft

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Security restrictions bypass

EUVDB-ID: #VU9899

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2018-0786

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass security restrictions on the target system.

The weakness exists due to improper validation of certificates by Microsoft .NET Framework (and .NET Core) components. A remote attacker can supply an invalid certificate and disregard the Enhanced Key Usage taggings.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Microsoft .NET Framework: 2.0 - 4.7.1

CPE2.3

cpe:2.3:a:microsoft:microsoft_.net_framework:4.7.1:*:*:*:*:*:*:*

External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0786

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

2) Improper Restriction of XML External Entity Reference

EUVDB-ID: #VU9900