#VU46500 Input validation error in ASP.NET Core MVC - CVE-2020-1045
Published: September 8, 2020
Vulnerability identifier: #VU46500
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2020-1045
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
ASP.NET Core MVC
ASP.NET Core MVC
Software vendor:
Microsoft
Microsoft
Description
The vulnerability allows a remote attacker to bypass certain security restrictions.
The vulnerability exists due to insufficient validation of encoded cookie names. The ASP.NET Core cookie parser decodes entire cookie strings which could allow a malicious attacker to set a second cookie with the name being percent encoded.
Remediation
Install updates from vendor's website.