# CVE-2019-17554: Improper Restriction of XML External Entity Reference in Apache Olingo

> An attacker can exploit an XML External Entity vulnerability in Apache Olingo to read sensitive files or cause denial of service via crafted XML requests.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 4 Dec 2019
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-mgh8-hcwj-h57v

## What is CVE-2019-17554?

CVE-2019-17554 is a medium-severity vulnerability in Apache Olingo, published on 4 Dec 2019. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

The XML content type entity deserializer in Apache Olingo versions 4.0.0 to 4.6.0 is not configured to deny the resolution of external entities. Request with content type "application/xml", which trigger the deserialization of entities, can be used to trigger XXE attacks.

Weakness: CWE-611 (Improper Restriction of XML External Entity Reference)

## Which versions are affected by CVE-2019-17554?

4 open source packages ship an affected version, including org.apache.olingo:odata-client-core and org.apache.olingo:odata-server-core. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `org.apache.olingo:odata-client-core` | Maven | From 4.0.0 | 4.7.0 |
| `org.apache.olingo:odata-client-core` | Maven | From 4.0.0 | 4.7.0 |
| `org.apache.olingo:odata-server-core` | Maven | From 4.0.0 | 4.7.0 |
| `org.apache.olingo:odata-server-core` | Maven | From 4.0.0 | 4.7.0 |

Products: Apache Olingo.

## How do I fix CVE-2019-17554?

Upgrade org.apache.olingo:odata-client-core to 4.7.0 or later.

## Is CVE-2019-17554 being exploited?

There is no known exploitation of CVE-2019-17554 in the wild and no public exploit code.

Public exploit code:

- Apache Olingo OData 4.0 - XML External Entity Injection (exploitdb)

## Other vulnerabilities in Apache Olingo

- [CVE-2019-17556](https://insights.sbomify.com/CVE-2019-17556/): Deserialization of Untrusted Data in Apache Olingo (critical 9.8)
- [CVE-2020-1925](https://insights.sbomify.com/CVE-2020-1925/): Server-Side Request Forgery (SSRF) in Apache Olingo (high 7.5)
- [CVE-2019-17555](https://insights.sbomify.com/CVE-2019-17555/): Improper input validation in Apache Olingo (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-17554 and fix it if it is affected.

What it is: CVE-2019-17554 is a medium-severity vulnerability in Apache Olingo, published on 4 Dec 2019. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2019-17554 in the wild and no public exploit code.

Affected packages and fixed versions:
- org.apache.olingo:odata-client-core (Maven): affected from 4.0.0; fixed in 4.7.0
- org.apache.olingo:odata-client-core (Maven): affected from 4.0.0; fixed in 4.7.0
- org.apache.olingo:odata-server-core (Maven): affected from 4.0.0; fixed in 4.7.0
- org.apache.olingo:odata-server-core (Maven): affected from 4.0.0; fixed in 4.7.0

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-2019-17554/ (Markdown: https://insights.sbomify.com/CVE-2019-17554/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-17554
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-17554
- OSV: https://osv.dev/vulnerability/CVE-2019-17554

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-17554/
Summaries are generated and may contain mistakes; the official description above is the record.