SB2018031316 - Multiple vulnerabilities in Microsoft ASP.NET Core
Published: March 13, 2018
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 vulnerabilities.
1) Improper input validation (CVE-ID: CVE-2018-0808)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear
The vulnerability allows a remote attacker to cause DoS condition on the target system.
The weakness exists due to an error in ASP.NET Core when handling malicious web requests. A remote attacker can issue specially crafted requests to the .NET Core application and cause a denial of service against an ASP.NET Core web application.
2) Privilege escalation (CVE-ID: CVE-2018-0787)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/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 improper validation of web requests by a Kestrel web application. A remote attacker can send a specially crafted request, containing injected HTML, initiate a "password reset" email to the target user, trigger as soon as the target user opens the "password reset" e-mail and gain system privileges.
3) Improper input validation (CVE-ID: CVE-2018-0875)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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 in the way that .NET Core handles specially crafted requests. A remote attacker can send a small number of specially crafted requests to an .NET Core web application, trigger a hash collision and cause performance to degrade significantly enough to cause service crash.
Remediation
Install update from vendor's website.