.NET Core on Red Hat Enterprise Linux update for rh-dotnet31-dotnet

1) Input validation error

EUVDB-ID: #VU46500

Risk: Medium

CVSSv3.1: 4.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-1045

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

rh-dotnet31-dotnet (Red Hat package): 3.1.101-4.el7 - 3.1.106-1.el7

External links

http://access.redhat.com/errata/RHSA-2020:3697

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.