Ubuntu update for dotnet6

1) Resource exhaustion

EUVDB-ID: #VU81728

Risk: High

CVSSv4.0: 6.9 [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:A/U:Amber]

CVE-ID: CVE-2023-44487

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improperly control of consumption for internal resources when handling HTTP/2 requests with compressed HEADERS frames. A remote attacker can send a sequence of compressed HEADERS frames followed by RST_STREAM frames and perform a denial of service (DoS) attack, a.k.a. "Rapid Reset".

Note, the vulnerability is being actively exploited in the wild.

Mitigation

Update the affected package dotnet6 to the latest version.

Vulnerable software versions

Ubuntu: 22.04 - 23.04

dotnet7 (Ubuntu package): before 7.0.112-0ubuntu1~22.04.1

dotnet6 (Ubuntu package): before 6.0.123-0ubuntu1~22.04.1

dotnet-sdk-7.0 (Ubuntu package): before 7.0.112-0ubuntu1~22.04.1

dotnet-sdk-6.0 (Ubuntu package): before 6.0.123-0ubuntu1~22.04.1

dotnet-runtime-7.0 (Ubuntu package): before 7.0.112-0ubuntu1~22.04.1

dotnet-runtime-6.0 (Ubuntu package): before 6.0.123-0ubuntu1~22.04.1

dotnet-hostfxr-7.0 (Ubuntu package): before 7.0.112-0ubuntu1~22.04.1

dotnet-hostfxr-6.0 (Ubuntu package): before 6.0.123-0ubuntu1~22.04.1

dotnet-host-7.0 (Ubuntu package): before 7.0.112-0ubuntu1~22.04.1

dotnet-host (Ubuntu package): before 6.0.123-0ubuntu1~22.04.1

aspnetcore-runtime-7.0 (Ubuntu package): before 7.0.112-0ubuntu1~22.04.1

aspnetcore-runtime-6.0 (Ubuntu package): before 6.0.123-0ubuntu1~22.04.1

CPE2.3

• cpe:2.3:o:canonical:ubuntu:22.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:23.04:*:*:*:*:*:*:*
• cpe:2.3:a:canonical:dotnet7_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:dotnet6_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:dotnet-sdk-7.0_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:dotnet-sdk-6.0_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:dotnet-runtime-7.0_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:dotnet-runtime-6.0_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:dotnet-hostfxr-7.0_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:dotnet-hostfxr-6.0_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:dotnet-host-7.0_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:dotnet-host_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:aspnetcore-runtime-7.0_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:aspnetcore-runtime-6.0_ubuntu_package:*:*:*:*:*:ubuntu:*:*

External links

https://ubuntu.com/security/notices/USN-6427-1

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?

Yes. This vulnerability is being exploited in the wild.