CVE-2021-3990 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) in star7th/showdoc
Medium 6.5
Published
Updated
Check this codebase for CVE-2021-3990 and fix it if it is affected.
What it is: CVE-2021-3990 is a medium-severity vulnerability in star7th/showdoc, published on 1 Dec 2021. 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-2021-3990 in the wild and no public exploit code.
Affected packages and fixed versions:
- showdoc/showdoc (Packagist): affected all versions; fixed in 2.9.13
- showdoc/showdoc (Packagist): affected all versions; fixed in 2.9.13
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-2021-3990/ (Markdown: https://insights.sbomify.com/CVE-2021-3990/index.md)
ShowDoc uses a weak PRNG, potentially allowing attackers to predict tokens or compromise security features.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-3990?
CVE-2021-3990 is a medium-severity vulnerability in star7th/showdoc, published on 1 Dec 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
showdoc is vulnerable to Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
Weakness: CWE-338
Which versions are affected by CVE-2021-3990?
2 open source packages ship an affected version, including showdoc/showdoc. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
showdoc/showdoc Packagist | All versions | 2.9.13 |
showdoc/showdoc Packagist | All versions | 2.9.13 |
Products include Showdoc Showdoc.
How do I fix CVE-2021-3990?
Upgrade showdoc/showdoc to 2.9.13 or later.
Is CVE-2021-3990 being exploited?
There is no known exploitation of CVE-2021-3990 in the wild and no public exploit code.
Other vulnerabilities in star7th/showdoc
- CVE-2021-41745 Showdoc File Upload Vulnerability
- CVE-2021-36440 Unrestricted File Upload in ShowDoc v2.9.5
- CVE-2022-0942 Stored XSS due to Unrestricted File Upload in star7th/showdoc
- CVE-2022-1034 There is a Unrestricted Upload of File vulnerability in ShowDoc v2.10.3 in star7th/showdoc
- CVE-2022-0945 Stored XSS viva axd and cshtml file upload in star7th/showdoc in star7th/showdoc
Sources
Also known as GHSA-vrgh-5w3c-ggf8.