SB2018010908 - Multiple vulnerabilities in Microsoft ASP.NET Core

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Main Vulnerability Database SB2018010908

SB2018010908 - Multiple vulnerabilities in Microsoft ASP.NET Core

Published: January 9, 2018

Security Bulletin ID SB2018010908
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 5
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 5 vulnerabilities.


1) Privilege escalation (CVE-ID: CVE-2018-0784)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote attacker to gain elevated privileges on the target system.

The weakness exists due to an error when a ASP.NET Core web application, created using vulnerable project templates, improperly sanitize web requests. A remote attacker can trick the victim into clicking a specially crafted link, perform content injection attacks and run script in the security context of the logged-on user.


2) Cross-site request forgery (CVE-ID: CVE-2018-0785)

CWE-ID: CWE-352 - Cross-Site Request Forgery (CSRF)

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote attacker to perform CSRF attack.

The weakness exists due to an error when a ASP.NET Core web application is created using vulnerable project templates. A remote attacker can create a specially crafted HTML page or URL, trick the victim into visiting it, gain access to the system and change the recovery codes associated with the victim's user account without his/her consent.

3) Cross-site scripting (CVE-ID: CVE-2018-0789)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear


Vulnerability allows a remote authenticated attacker to perform XSS attacks.

The vulnerability is caused by an input validation error of a specially crafted web request to an affected SharePoint server. A remote attacker can trick the victim to follow a specially specially crafted link and execute arbitrary HTML and script code in victim's browser in security context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.


4) Security restrictions bypass (CVE-ID: CVE-2018-0786)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear


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.

5) Improper Restriction of XML External Entity Reference (CVE-ID: CVE-2018-0764)

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

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear


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.

References