# CVE-2016-0793: WildFly has incomplete blacklist vulnerability

> Remote attackers can read sensitive WEB-INF and META-INF files in WildFly on Windows by bypassing servlet filter restrictions using case variations or special characters.

- **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:** 1 Apr 2016
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-9q87-22gr-r8qf

## What is CVE-2016-0793?

CVE-2016-0793 is a high-severity path traversal vulnerability in n/a, published on 1 Apr 2016. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Incomplete blacklist vulnerability in the servlet filter restriction mechanism in WildFly (formerly JBoss Application Server) before 10.0.0.Final on Windows allows remote attackers to read the sensitive files in the (1) WEB-INF or (2) META-INF directory via a request that contains (a) lowercase or (b) "meaningless" characters.

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

## Which versions are affected by CVE-2016-0793?

4 open source packages ship an affected version, including org.wildfly:wildfly-parent and org.wildfly:wildfly-undertow. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `org.wildfly:wildfly-parent` | Maven | All versions | 10.0.0.Final |
| `org.wildfly:wildfly-parent` | Maven | All versions | 10.0.0.Final |
| `org.wildfly:wildfly-undertow` | Maven | All versions | 10.0.0.Final |
| `org.wildfly:wildfly-undertow` | Maven | All versions | 10.0.0.Final |

Products: Redhat Jboss Wildfly Application Server.

## How do I fix CVE-2016-0793?

Upgrade org.wildfly:wildfly-parent to 10.0.0.Final or later.

## Is CVE-2016-0793 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2016-0793 exists.

Public exploit code:

- Wildfly - 'WEB-INF' / 'META-INF' Information Disclosure via Filter Restriction Bypass (exploitdb)
- https://github.com/tafamace/CVE-2016-0793 (github_poc): https://github.com/tafamace/CVE-2016-0793

## Other vulnerabilities in n/a

- [CVE-2016-9589](https://insights.sbomify.com/CVE-2016-9589/): Red Hat Wildfly DoS (high 7.5)
- [CVE-2015-3198](https://insights.sbomify.com/CVE-2015-3198/): The Undertow module of WildFly allows source code disclosure (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2016-0793 and fix it if it is affected.

What it is: CVE-2016-0793 is a high-severity path traversal vulnerability in n/a, published on 1 Apr 2016. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2016-0793 exists.

Affected packages and fixed versions:
- org.wildfly:wildfly-parent (Maven): affected all versions; fixed in 10.0.0.Final
- org.wildfly:wildfly-parent (Maven): affected all versions; fixed in 10.0.0.Final
- org.wildfly:wildfly-undertow (Maven): affected all versions; fixed in 10.0.0.Final
- org.wildfly:wildfly-undertow (Maven): affected all versions; fixed in 10.0.0.Final

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-2016-0793/ (Markdown: https://insights.sbomify.com/CVE-2016-0793/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-0793
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-0793
- OSV: https://osv.dev/vulnerability/CVE-2016-0793

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From sbomify Insights: https://insights.sbomify.com/CVE-2016-0793/
Summaries are generated and may contain mistakes; the official description above is the record.