# CVE-2020-9495: Injection in Apache Archiva

> An attacker can retrieve arbitrary user attribute data from the connected LDAP server via a timing-based injection in the login form.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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:** 19 Jun 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-v83p-xwm9-v4g8

## What is CVE-2020-9495?

CVE-2020-9495 is a medium-severity vulnerability in Apache Archiva, published on 19 Jun 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Apache Archiva login service before 2.2.5 is vulnerable to LDAP injection. A attacker is able to retrieve user attribute data from the connected LDAP server by providing special values to the login form. With certain characters it is possible to modify the LDAP filter used to query the LDAP users. By measuring the response time for the login request, arbitrary attribute data can be retrieved from LDAP user objects.

Weakness: CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component)

## Which versions are affected by CVE-2020-9495?

2 open source packages ship an affected version, including org.apache.archiva:archiva. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `org.apache.archiva:archiva` | Maven | All versions | 2.2.5 |
| `org.apache.archiva:archiva` | Maven | All versions | 2.2.5 |

Products: Apache Archiva.

## How do I fix CVE-2020-9495?

Upgrade org.apache.archiva:archiva to 2.2.5 or later.

## Is CVE-2020-9495 being exploited?

There is no known exploitation of CVE-2020-9495 in the wild and no public exploit code.

Public exploit code:

- https://github.com/ggolawski/CVE-2020-9495 (github_poc): https://github.com/ggolawski/CVE-2020-9495

## Other vulnerabilities in Apache Archiva

- [CVE-2013-2251](https://insights.sbomify.com/CVE-2013-2251/): Apache Struts Improper Input Validation (critical 9.8, exploited in the wild)
- [CVE-2016-4469](https://insights.sbomify.com/CVE-2016-4469/): Cross-site request forgery in n/a (high 8.8)
- [CVE-2017-5657](https://insights.sbomify.com/CVE-2017-5657/): Apache Archiva vulnerable to Cross Site Request Forgery (high 8.0)
- [CVE-2024-27138](https://insights.sbomify.com/CVE-2024-27138/): Apache Archiva: disabling user registration is not effective (high 7.5)
- [CVE-2024-27139](https://insights.sbomify.com/CVE-2024-27139/): Apache Archiva: incorrect authentication potentially leading to account takeover (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-9495 and fix it if it is affected.

What it is: CVE-2020-9495 is a medium-severity vulnerability in Apache Archiva, published on 19 Jun 2020. 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-2020-9495 in the wild and no public exploit code.

Affected packages and fixed versions:
- org.apache.archiva:archiva (Maven): affected all versions; fixed in 2.2.5
- org.apache.archiva:archiva (Maven): affected all versions; fixed in 2.2.5

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-2020-9495/ (Markdown: https://insights.sbomify.com/CVE-2020-9495/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-9495
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-9495
- OSV: https://osv.dev/vulnerability/CVE-2020-9495

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-9495/
Summaries are generated and may contain mistakes; the official description above is the record.