# CVE-2018-1099: DNS Rebinding in etcd

> An attacker can exploit DNS rebinding in etcd to trick browsers into sending requests to localhost, bypassing network restrictions.

- **Severity:** Medium 5.5 (`CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 3 Apr 2018
- **Updated:** 17 Sep 2024
- **Also known as:** CLEANSTART-2026-NI80451, DEBIAN-CVE-2018-1099, GHSA-wf43-55jj-vwq8, UBUNTU-CVE-2018-1099

## What is CVE-2018-1099?

CVE-2018-1099 is a medium-severity server-side request forgery vulnerability in Fedoraproject Fedora, published on 3 Apr 2018. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

DNS rebinding vulnerability found in etcd 3.3.1 and earlier. An attacker can control his DNS records to direct to localhost, and trick the browser into sending requests to localhost (or any other address).

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2018-1099?

2 open source packages ship an affected version, including go.etcd.io/etcd. It affects 2 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `go.etcd.io/etcd` | Go | All versions | 3.4.0 |
| `go.etcd.io/etcd` | Go | All versions | 3.4.0 |

Products: Fedoraproject Fedora, Redhat Etcd.

## How do I fix CVE-2018-1099?

Upgrade go.etcd.io/etcd to 3.4.0 or later.

## Is CVE-2018-1099 being exploited?

There is no known exploitation of CVE-2018-1099 in the wild and no public exploit code.

## Other vulnerabilities in Fedoraproject Fedora

- [CVE-2024-4577](https://insights.sbomify.com/CVE-2024-4577/): PHP-CGI OS Command Injection (critical 9.8, exploited in the wild)
- [CVE-2021-39226](https://insights.sbomify.com/CVE-2021-39226/): Grafana Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2019-5544](https://insights.sbomify.com/CVE-2019-5544/): VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild)
- [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-1099 and fix it if it is affected.

What it is: CVE-2018-1099 is a medium-severity server-side request forgery vulnerability in Fedoraproject Fedora, published on 3 Apr 2018. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2018-1099 in the wild and no public exploit code.

Affected packages and fixed versions:
- go.etcd.io/etcd (Go): affected all versions; fixed in 3.4.0
- go.etcd.io/etcd (Go): affected all versions; fixed in 3.4.0

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-2018-1099/ (Markdown: https://insights.sbomify.com/CVE-2018-1099/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-1099
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-1099
- OSV: https://osv.dev/vulnerability/CVE-2018-1099

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-1099/
Summaries are generated and may contain mistakes; the official description above is the record.