# CVE-2024-39312: Botan has an Authorization Error due to Name Constraint Decoding Bug

> Attackers can bypass X.509 name constraint checks in Botan, allowing certificates that should be rejected to be accepted.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 8 Jul 2024
- **Updated:** 2 Aug 2024
- **Also known as:** ALPINE-CVE-2024-39312, AZL-43825, AZL-44286, DEBIAN-CVE-2024-39312, GHSA-jp24-56jm-gg86, UBUNTU-CVE-2024-39312

## What is CVE-2024-39312?

CVE-2024-39312 is a medium-severity vulnerability in randombit botan, published on 8 Jul 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Botan is a C++ cryptography library. X.509 certificates can identify elliptic curves using either an object identifier or using explicit encoding of the parameters. A bug in the parsing of name constraint extensions in X.509 certificates meant that if the extension included both permitted subtrees and excluded subtrees, only the permitted subtree would be checked. If a certificate included a name which was permitted by the permitted subtree but also excluded by excluded subtree, it would be accepted. Fixed in versions 3.5.0 and 2.19.5.

Weakness: CWE-295 (Improper Certificate Validation)

## Which versions are affected by CVE-2024-39312?

It affects 1 product.


Products: Botan Project Botan.

## How do I fix CVE-2024-39312?

Upgrade to a fixed version.

## Is CVE-2024-39312 being exploited?

There is no known exploitation of CVE-2024-39312 in the wild and no public exploit code.

## Other vulnerabilities in randombit botan

- [CVE-2021-24115](https://insights.sbomify.com/CVE-2021-24115/): Information disclosure in n/a (critical 9.8)
- [CVE-2018-9127](https://insights.sbomify.com/CVE-2018-9127/): Security feature bypass in n/a (critical 9.8)
- [CVE-2015-7826](https://insights.sbomify.com/CVE-2015-7826/): Security feature bypass in n/a (critical 9.8)
- [CVE-2016-6878](https://insights.sbomify.com/CVE-2016-6878/): Other in n/a (critical 9.8)
- [CVE-2016-9132](https://insights.sbomify.com/CVE-2016-9132/): Integer overflow in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-39312 and fix it if it is affected.

What it is: CVE-2024-39312 is a medium-severity vulnerability in randombit botan, published on 8 Jul 2024. 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-2024-39312 in the wild and no public exploit code.

Affected product: randombit botan. 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-2024-39312/ (Markdown: https://insights.sbomify.com/CVE-2024-39312/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-39312
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-39312
- OSV: https://osv.dev/vulnerability/CVE-2024-39312

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-39312/
Summaries are generated and may contain mistakes; the official description above is the record.