CVE-2020-8156 Security feature bypass in Nextcloud Mail
High 7.0
Published
Updated
Check this codebase for CVE-2020-8156 and fix it if it is affected.
What it is: CVE-2020-8156 is a high-severity vulnerability in Fedoraproject Fedora, published on 12 May 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-8156 in the wild and no public exploit code.
Affected product: Fedoraproject Fedora. No package-level version data is available, so check the vendor advisory linked from the reference page.
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-2020-8156/ (Markdown: https://insights.sbomify.com/CVE-2020-8156/index.md)
Missing TLS host verification in Nextcloud Mail allows man-in-the-middle attacks, enabling data interception.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-8156?
CVE-2020-8156 is a high-severity vulnerability in Fedoraproject Fedora, published on 12 May 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A missing verification of the TLS host in Nextcloud Mail 1.1.3 allowed a man in the middle attack.
Weakness: CWE-295
Which versions are affected by CVE-2020-8156?
It affects 2 products.
Products include Fedoraproject Fedora, Nextcloud Mail.
How do I fix CVE-2020-8156?
No fix has been published for CVE-2020-8156 yet. Limit exposure of the affected software until one is available.
Is CVE-2020-8156 being exploited?
There is no known exploitation of CVE-2020-8156 in the wild and no public exploit code.
Other vulnerabilities in Fedoraproject Fedora
Sources
Also known as GHSA-fgvj-4m6x-j67f.