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	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: 6.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

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

External links

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

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.

2) Improper Restriction of XML External Entity Reference

EUVDB-ID: #VU9900

Risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-0764

CWE-ID: CWE-611 - Improper Restriction of XML External Entity Reference ('XXE')