Security Updates for Microsoft .NET Framework (July 2019)

high Nessus Plugin ID 126600


The Microsoft .NET Framework installation on the remote host is affected by multiple vulnerabilities.


The Microsoft .NET Framework installation on the remote host is missing security updates. It is, therefore, affected by multiple vulnerabilities :

- An authentication bypass vulnerability exists in Windows Communication Foundation (WCF) and Windows Identity Foundation (WIF), allowing signing of SAML tokens with arbitrary symmetric keys. This vulnerability allows an attacker to impersonate another user, which can lead to elevation of privileges. The vulnerability exists in WCF, WIF 3.5 and above in .NET Framework, WIF 1.0 component in Windows, WIF Nuget package, and WIF implementation in SharePoint. An unauthenticated attacker can exploit this by signing a SAML token with any arbitrary symmetric key. This security update addresses the issue by ensuring all versions of WCF and WIF validate the key used to sign SAML tokens correctly.

- A remote code execution vulnerability exists in .NET software when the software fails to check the source markup of a file. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the current user. If the current user is logged on with administrative user rights, an attacker could take control of the affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

- A denial of service vulnerability exists when Microsoft Common Object Runtime Library improperly handles web requests. An attacker who successfully exploited this vulnerability could cause a denial of service against a .NET web application. A remote unauthenticated attacker could exploit this vulnerability by issuing specially crafted requests to the .NET application. The update addresses the vulnerability by correcting how the .NET web application handles web requests. (CVE-2019-1083)


Microsoft has released security updates for Microsoft .NET Framework.

See Also

Plugin Details

Severity: High

ID: 126600

File Name: smb_nt_ms19_jul_dotnet.nasl

Version: 1.5

Type: local

Agent: windows

Published: 7/10/2019

Updated: 6/3/2021

Risk Information

CVSS Score Source: CVE-2019-1113


Risk Factor: Medium

Score: 5.9


Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P

Temporal Vector: E:U/RL:OF/RC:C


Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:microsoft:.net_framework

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Exploit Ease: No known exploits are available

Patch Publication Date: 7/9/2019

Vulnerability Publication Date: 7/9/2019

Reference Information

CVE: CVE-2019-1006, CVE-2019-1083, CVE-2019-1113

BID: 108977, 108981

MSKB: 4507435, 4507460, 4507423, 4507422, 4507421, 4507420, 4507414, 4507419, 4507412, 4507413, 4507411, 4506991, 4507450, 4506987, 4506986, 4507455, 4506989, 4506988, 4507458

MSFT: MS19-4507435, MS19-4507460, MS19-4507423, MS19-4507422, MS19-4507421, MS19-4507420, MS19-4507414, MS19-4507419, MS19-4507412, MS19-4507413, MS19-4507411, MS19-4506991, MS19-4507450, MS19-4506987, MS19-4506986, MS19-4507455, MS19-4506989, MS19-4506988, MS19-4507458

IAVA: 2019-A-0240-S