# CVE-2018-11783: Information disclosure in Apache Traffic Server

> The sslheaders plugin fails to strip client certificate headers, potentially allowing attackers to spoof identity or access sensitive data.

- **Severity:** High 7.5 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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:** 7 Mar 2019
- **Updated:** 16 Sep 2024
- **Also known as:** DEBIAN-CVE-2018-11783, GHSA-xr2q-4fvx-23gr, UBUNTU-CVE-2018-11783

## What is CVE-2018-11783?

CVE-2018-11783 is a high-severity vulnerability in Apache Traffic Server, published on 7 Mar 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

sslheaders plugin extracts information from the client certificate and sets headers in the request based on the configuration of the plugin. The plugin doesn't strip the headers from the request in some scenarios. This problem was discovered in versions 6.0.0 to 6.0.3, 7.0.0 to 7.1.5, and 8.0.0 to 8.0.1.

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2018-11783?

It affects 1 product.


Products: Apache Traffic Server.

## How do I fix CVE-2018-11783?

Upgrade to a fixed version.

## Is CVE-2018-11783 being exploited?

There is no known exploitation of CVE-2018-11783 in the wild and no public exploit code.

## Other vulnerabilities in Apache Traffic Server

- [CVE-2014-3525](https://insights.sbomify.com/CVE-2014-3525/): Other in n/a (critical 10.0)
- [CVE-2021-43082](https://insights.sbomify.com/CVE-2021-43082/): heap-buffer-overflow with stats-over-http plugin (critical 9.8)
- [CVE-2021-35474](https://insights.sbomify.com/CVE-2021-35474/): Dynamic stack buffer overflow in cachekey plugin (critical 9.8)
- [CVE-2019-17559](https://insights.sbomify.com/CVE-2019-17559/): Other in Apache Traffic Server (critical 9.8)
- [CVE-2019-17565](https://insights.sbomify.com/CVE-2019-17565/): Other in Apache Traffic Server (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-11783 and fix it if it is affected.

What it is: CVE-2018-11783 is a high-severity vulnerability in Apache Traffic Server, published on 7 Mar 2019. 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-2018-11783 in the wild and no public exploit code.

Affected product: Apache Traffic Server. 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-2018-11783/ (Markdown: https://insights.sbomify.com/CVE-2018-11783/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-11783
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-11783
- OSV: https://osv.dev/vulnerability/CVE-2018-11783

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-11783/
Summaries are generated and may contain mistakes; the official description above is the record.