Multiple vulnerabilities in Microsoft .NET Framework

Published: 2018-01-09 21:32:52 | Updated: 2018-01-09 21:36:36
Severity Low
Patch available YES
Number of vulnerabilities 2
CVE ID CVE-2018-0786
CVE-2018-0764
CVSSv3 6.3 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]
4.6 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]
CWE ID CWE-20
CWE-611
Exploitation vector Network
Public exploit Not available
Vulnerable software Microsoft .NET Framework
Vulnerable software versions Microsoft .NET Framework 4.7.1
Microsoft .NET Framework 4.6.2/4.7
Microsoft .NET Framework 4.6/4.6.1
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Vendor URL Microsoft

Security Advisory

1) Security restrictions bypass

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.

Remediation

Install update from vendor's website.

External links

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

2) Improper Restriction of XML External Entity Reference

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists due to improper processing of XML documents by .NET, and .NET core. A remote attacker can issue specially crafted requests to a .NET(or .NET core) application and cause the application to crash.

Remediation

Install update from vendor's website.

External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0764

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