Ubuntu update for dotnet6

Published: 2023-11-15

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2023-36558 CVE-2023-36049
CWE-ID	CWE-254 CWE-264
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	Ubuntu Operating systems & Components / Operating system dotnet8 (Ubuntu package) Operating systems & Components / Operating system package or component dotnet7 (Ubuntu package) Operating systems & Components / Operating system package or component dotnet6 (Ubuntu package) Operating systems & Components / Operating system package or component dotnet-sdk-8.0 (Ubuntu package) Operating systems & Components / Operating system package or component dotnet-sdk-7.0 (Ubuntu package) Operating systems & Components / Operating system package or component dotnet-sdk-6.0 (Ubuntu package) Operating systems & Components / Operating system package or component dotnet-runtime-8.0 (Ubuntu package) Operating systems & Components / Operating system package or component dotnet-runtime-7.0 (Ubuntu package) Operating systems & Components / Operating system package or component dotnet-runtime-6.0 (Ubuntu package) Operating systems & Components / Operating system package or component dotnet-hostfxr-8.0 (Ubuntu package) Operating systems & Components / Operating system package or component dotnet-hostfxr-7.0 (Ubuntu package) Operating systems & Components / Operating system package or component dotnet-hostfxr-6.0 (Ubuntu package) Operating systems & Components / Operating system package or component dotnet-host-8.0 (Ubuntu package) Operating systems & Components / Operating system package or component dotnet-host-7.0 (Ubuntu package) Operating systems & Components / Operating system package or component dotnet-host (Ubuntu package) Operating systems & Components / Operating system package or component aspnetcore-runtime-8.0 (Ubuntu package) Operating systems & Components / Operating system package or component aspnetcore-runtime-7.0 (Ubuntu package) Operating systems & Components / Operating system package or component aspnetcore-runtime-6.0 (Ubuntu package) Operating systems & Components / Operating system package or component
Vendor	Canonical Ltd.

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Security features bypass

EUVDB-ID: #VU83142

Risk: Low

CVSSv4.0: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-36558

CWE-ID: CWE-254 - Security Features

Exploit availability: No

Description

The vulnerability allows a local attacker to compromise the target system.

The vulnerability exists due to security features bypass in ASP.NET Core. A local attacker can bypass validations on Blazor Server forms and gain access to sensitive information.

Mitigation

Update the affected package dotnet6 to the latest version.

Vulnerable software versions

Ubuntu: 22.04 - 23.10

dotnet8 (Ubuntu package): before 8.0.100-8.0.0-0ubuntu1~23.10.1

dotnet7 (Ubuntu package): before 7.0.114-0ubuntu1~22.04.1

dotnet6 (Ubuntu package): before 6.0.125-0ubuntu1~22.04.1

dotnet-sdk-8.0 (Ubuntu package): before 8.0.100-0ubuntu1~23.10.1

dotnet-sdk-7.0 (Ubuntu package): before 7.0.114-0ubuntu1~22.04.1

dotnet-sdk-6.0 (Ubuntu package): before 6.0.125-0ubuntu1~22.04.1

dotnet-runtime-8.0 (Ubuntu package): before 8.0.0-0ubuntu1~23.10.1

dotnet-runtime-7.0 (Ubuntu package): before 7.0.114-0ubuntu1~22.04.1

dotnet-runtime-6.0 (Ubuntu package): before 6.0.125-0ubuntu1~22.04.1

dotnet-hostfxr-8.0 (Ubuntu package): before 8.0.0-0ubuntu1~23.10.1

dotnet-hostfxr-7.0 (Ubuntu package): before 7.0.114-0ubuntu1~22.04.1

dotnet-hostfxr-6.0 (Ubuntu package): before 6.0.125-0ubuntu1~22.04.1

dotnet-host-8.0 (Ubuntu package): before 8.0.0-0ubuntu1~23.10.1

dotnet-host-7.0 (Ubuntu package): before 7.0.114-0ubuntu1~22.04.1

dotnet-host (Ubuntu package): before 6.0.125-0ubuntu1~22.04.1

aspnetcore-runtime-8.0 (Ubuntu package): before 8.0.0-0ubuntu1~23.10.1

aspnetcore-runtime-7.0 (Ubuntu package): before 7.0.114-0ubuntu1~22.04.1

aspnetcore-runtime-6.0 (Ubuntu package): before 6.0.125-0ubuntu1~22.04.1

CPE2.3

External links

https://ubuntu.com/security/notices/USN-6480-1

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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

2) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU83152

Risk: Medium

CVSSv4.0: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-36049

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote user to escalate privileges on the system.

The vulnerability exists due to application does not properly impose security restrictions in .NET, .NET Framework and Visual Studio, which leads to security restrictions bypass and privilege escalation.