CVE-2021-31204 .NET and Visual Studio Elevation of Privilege Vulnerability
High 7.3
Published
Updated
Check this codebase for CVE-2021-31204 and fix it if it is affected.
What it is: CVE-2021-31204 is a high-severity vulnerability in Fedoraproject Fedora, published on 11 May 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-31204 in the wild and no public exploit code.
Affected packages and fixed versions:
- dotnet (Bitnami): affected from 5.0.0; fixed in 5.0.6
- dotnet-sdk (Bitnami): affected from 5.0.0; fixed in 5.0.6
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2021-31204/ (Markdown: https://insights.sbomify.com/CVE-2021-31204/index.md)
Attackers can exploit this vulnerability in .NET and Visual Studio to elevate privileges on affected systems.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-31204?
CVE-2021-31204 is a high-severity vulnerability in Fedoraproject Fedora, published on 11 May 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
.NET and Visual Studio Elevation of Privilege Vulnerability
Weakness: CWE-269
Which versions are affected by CVE-2021-31204?
2 open source packages ship an affected version, including dotnet and dotnet-sdk. It affects 4 products.
| Package | Affected | Fixed in |
|---|---|---|
dotnet Bitnami | From 5.0.0 | 5.0.6 |
dotnet-sdk Bitnami | From 5.0.0 | 5.0.6 |
Linux distribution packages (38)
aspnetcore-runtime-3.1 Red Hat:enterprise_linux:8::appstream | All versions | 0:3.1.15-1.el8_4 |
aspnetcore-runtime-5.0 Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.6-1.el8_4 |
aspnetcore-targeting-pack-3.1 Red Hat:enterprise_linux:8::appstream | All versions | 0:3.1.15-1.el8_4 |
aspnetcore-targeting-pack-5.0 Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.6-1.el8_4 |
dotnet Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.203-1.el8_4 |
dotnet-apphost-pack-3.1 Red Hat:enterprise_linux:8::appstream | All versions | 0:3.1.15-1.el8_4 |
dotnet-apphost-pack-3.1-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:3.1.15-1.el8_4 |
dotnet-apphost-pack-5.0 Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.6-1.el8_4 |
dotnet-apphost-pack-5.0-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.6-1.el8_4 |
dotnet-host Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.6-1.el8_4 |
dotnet-host-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.6-1.el8_4 |
dotnet-hostfxr-3.1 Red Hat:enterprise_linux:8::appstream | All versions | 0:3.1.15-1.el8_4 |
dotnet-hostfxr-3.1-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:3.1.15-1.el8_4 |
dotnet-hostfxr-5.0 Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.6-1.el8_4 |
dotnet-hostfxr-5.0-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.6-1.el8_4 |
dotnet-runtime-3.1 Red Hat:enterprise_linux:8::appstream | All versions | 0:3.1.15-1.el8_4 |
dotnet-runtime-3.1-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:3.1.15-1.el8_4 |
dotnet-runtime-5.0 Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.6-1.el8_4 |
dotnet-runtime-5.0-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.6-1.el8_4 |
dotnet-sdk-3.1 Red Hat:enterprise_linux:8::appstream | All versions | 0:3.1.115-1.el8_4 |
dotnet-sdk-3.1-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:3.1.115-1.el8_4 |
dotnet-sdk-5.0 Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.203-1.el8_4 |
dotnet-sdk-5.0-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.203-1.el8_4 |
dotnet-targeting-pack-3.1 Red Hat:enterprise_linux:8::appstream | All versions | 0:3.1.15-1.el8_4 |
dotnet-targeting-pack-5.0 Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.6-1.el8_4 |
dotnet-templates-3.1 Red Hat:enterprise_linux:8::appstream | All versions | 0:3.1.115-1.el8_4 |
dotnet-templates-5.0 Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.203-1.el8_4 |
dotnet3.1 Red Hat:enterprise_linux:8::appstream | All versions | 0:3.1.115-1.el8_4 |
dotnet3.1-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:3.1.115-1.el8_4 |
dotnet3.1-debugsource Red Hat:enterprise_linux:8::appstream | All versions | 0:3.1.115-1.el8_4 |
dotnet5.0 Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.203-1.el8_4 |
dotnet5.0-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.203-1.el8_4 |
dotnet5.0-debugsource Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.203-1.el8_4 |
netstandard-targeting-pack-2.1 Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.203-1.el8_4 |
rh-dotnet31-aspnetcore-runtime-3.1 Red Hat:rhel_dotnet:3.1::el7 | All versions | 0:3.1.15-1.el7_9 |
rh-dotnet31-aspnetcore-targeting-pack-3.1 Red Hat:rhel_dotnet:3.1::el7 | All versions | 0:3.1.15-1.el7_9 |
rh-dotnet31-dotnet Red Hat:rhel_dotnet:3.1::el7 | All versions | 0:3.1.115-1.el7_9 |
rh-dotnet31-dotnet-apphost-pack-3.1 Red Hat:rhel_dotnet:3.1::el7 | All versions | 0:3.1.15-1.el7_9 |
Products include Fedoraproject Fedora, Microsoft .Net, Microsoft .Net Core, Microsoft Visual Studio 2019.
How do I fix CVE-2021-31204?
Upgrade dotnet to 5.0.6 or later.
Is CVE-2021-31204 being exploited?
There is no known exploitation of CVE-2021-31204 in the wild and no public exploit code.
Other vulnerabilities in Fedoraproject Fedora
Sources
Also known as BIT-dotnet-2021-31204, BIT-dotnet-sdk-2021-31204, RHSA-2021:1546, RHSA-2021:1547, RHSA-2021:2036, RHSA-2021:2037.