# CVE-2020-8624: update-policy rules of type "subdomain" are enforced incorrectly

> Attackers with limited zone update privileges can modify unauthorized zone data due to incorrect enforcement of subdomain update policies in BIND.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 21 Aug 2020
- **Updated:** 16 Sep 2024
- **Also known as:** ALPINE-CVE-2020-8624, DEBIAN-CVE-2020-8624, GHSA-qgv6-6x66-mr9j, UBUNTU-CVE-2020-8624

## What is CVE-2020-8624?

CVE-2020-8624 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 21 Aug 2020. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

In BIND 9.9.12 -> 9.9.13, 9.10.7 -> 9.10.8, 9.11.3 -> 9.11.21, 9.12.1 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.9.12-S1 -> 9.9.13-S1, 9.11.3-S1 -> 9.11.21-S1 of the BIND 9 Supported Preview Edition, An attacker who has been granted privileges to change a specific subset of the zone's content could abuse these unintended additional privileges to update other contents of the zone.

Weakness: CWE-269 (Improper Privilege Management)

## Which versions are affected by CVE-2020-8624?

It affects 6 products.


Products: Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Isc Bind, Netapp Steelstore Cloud Integrated Storage, Opensuse Leap.

## How do I fix CVE-2020-8624?

Upgrade to a fixed version.

## Is CVE-2020-8624 being exploited?

There is no known exploitation of CVE-2020-8624 in the wild and no public exploit code.

## Other vulnerabilities in Canonical Ubuntu Linux

- [CVE-2020-11651](https://insights.sbomify.com/CVE-2020-11651/): SaltStack Salt Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2020-7247](https://insights.sbomify.com/CVE-2020-7247/): OpenSMTPD Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2019-16928](https://insights.sbomify.com/CVE-2019-16928/): Exim Out-of-bounds Write (critical 9.8, exploited in the wild)
- [CVE-2018-6789](https://insights.sbomify.com/CVE-2018-6789/): Exim Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2015-2590](https://insights.sbomify.com/CVE-2015-2590/): Oracle Java SE and Java SE Embedded Remote Code Execution (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-8624 and fix it if it is affected.

What it is: CVE-2020-8624 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 21 Aug 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-8624 in the wild and no public exploit code.

Affected product: Canonical Ubuntu Linux. 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-2020-8624/ (Markdown: https://insights.sbomify.com/CVE-2020-8624/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-8624
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-8624
- OSV: https://osv.dev/vulnerability/CVE-2020-8624

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-8624/
Summaries are generated and may contain mistakes; the official description above is the record.