# CVE-2016-0903: Auth bypass in n/a

> Remote attackers can spoof clients to read backup data due to reliance on client-side authentication in EMC Avamar Server.

- **Severity:** Critical 9.1 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 21 Sep 2016
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-68jp-qmpx-qxww

## What is CVE-2016-0903?

CVE-2016-0903 is a critical authentication bypass vulnerability in n/a, published on 21 Sep 2016. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Avamar Data Store (ADS) and Avamar Virtual Edition (AVE) in EMC Avamar Server before 7.3.0-233 rely on client-side authentication, which allows remote attackers to spoof clients and read backup data via a modified client agent.

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

## Which versions are affected by CVE-2016-0903?

It affects 1 product.


Products: Emc Avamar Server.

## How do I fix CVE-2016-0903?

No fix has been published for CVE-2016-0903 yet. Limit exposure of the affected software until one is available.

## Is CVE-2016-0903 being exploited?

There is no known exploitation of CVE-2016-0903 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2017-15548](https://insights.sbomify.com/CVE-2017-15548/): Auth bypass in EMC Avamar Server 7.1.x, 7.2.x, 7.3.x, 7.4.x, 7.5.0, EMC NetWorker Virtual Edition (NVE) 9.0.x, 9.1.x, 9.2.x, EMC Integrated Data Protection Appliance 2.0 (critical 9.8)
- [CVE-2017-4989](https://insights.sbomify.com/CVE-2017-4989/): Auth bypass in EMC Avamar Server Software 7.3.1-125, 7.3.0-233, 7.3.0-226, 7.2.1-32, 7.2.1-31, 7.2.0-401 (critical 9.8)
- [CVE-2017-4990](https://insights.sbomify.com/CVE-2017-4990/): File upload in EMC Avamar Server Software 7.4.1-58, 7.4.0-242, 7.3.1-125, 7.3.0-233, 7.3.0-226 (critical 9.8)
- [CVE-2013-3274](https://insights.sbomify.com/CVE-2013-3274/): Missing authorization in n/a (critical 9.0)
- [CVE-2017-15549](https://insights.sbomify.com/CVE-2017-15549/): File upload in EMC Avamar Server 7.1.x, 7.2.x, 7.3.x, 7.4.x, 7.5.0, EMC NetWorker Virtual Edition (NVE) 9.0.x, 9.1.x, 9.2.x, EMC Integrated Data Protection Appliance 2.0 (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2016-0903 and fix it if it is affected.

What it is: CVE-2016-0903 is a critical authentication bypass vulnerability in n/a, published on 21 Sep 2016. 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-2016-0903 in the wild and no public exploit code.

Affected product: n/a. 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-2016-0903/ (Markdown: https://insights.sbomify.com/CVE-2016-0903/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-0903
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-0903
- OSV: https://osv.dev/vulnerability/CVE-2016-0903

---
From sbomify Insights: https://insights.sbomify.com/CVE-2016-0903/
Summaries are generated and may contain mistakes; the official description above is the record.