# CVE-2019-1656: Cisco Enterprise NFV Infrastructure Software Linux Shell Access Vulnerability

> Authenticated local attackers can exploit improper input validation in the CLI to gain shell access to the underlying Linux OS via console connections.

- **Severity:** Medium 5.3 (`CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 24 Jan 2019
- **Updated:** 21 Nov 2024
- **Also known as:** GHSA-6723-4qx5-jmc9

## What is CVE-2019-1656?

CVE-2019-1656 is a medium-severity command injection vulnerability in Cisco Enterprise NFV Infrastructure Software, published on 24 Jan 2019. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability in the CLI of Cisco Enterprise NFV Infrastructure Software (NFVIS) could allow an authenticated, local attacker to access the shell of the underlying Linux operating system on the affected device. The vulnerability is due to improper input validation in the affected software. An attacker could exploit this vulnerability by sending crafted commands to the affected device. An exploit could allow the attacker to gain shell access with a nonroot user account to the underlying Linux operating system on the affected device and potentially access system configuration files with sensitive information. This vulnerability only affects console connections from CIMC. It does not apply to remote connections, such as telnet or SSH.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2019-1656?

It affects 1 product.


Products: Cisco Enterprise Nfv Infrastructure Software.

## How do I fix CVE-2019-1656?

No fix has been published for CVE-2019-1656 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-1656 being exploited?

There is no known exploitation of CVE-2019-1656 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Enterprise NFV Infrastructure Software

- [CVE-2022-20777](https://insights.sbomify.com/CVE-2022-20777/): Cisco Enterprise NFV Infrastructure Software Vulnerabilities (critical 9.9)
- [CVE-2022-20779](https://insights.sbomify.com/CVE-2022-20779/): Cisco Enterprise NFV Infrastructure Software Vulnerabilities (critical 9.9)
- [CVE-2022-20780](https://insights.sbomify.com/CVE-2022-20780/): Cisco Enterprise NFV Infrastructure Software Vulnerabilities (critical 9.9)
- [CVE-2021-34746](https://insights.sbomify.com/CVE-2021-34746/): Cisco Enterprise NFV Infrastructure Software Authentication Bypass Vulnerability (critical 9.8)
- [CVE-2020-3470](https://insights.sbomify.com/CVE-2020-3470/): Cisco Integrated Management Controller Multiple Remote Code Execution Vulnerabilities (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-1656 and fix it if it is affected.

What it is: CVE-2019-1656 is a medium-severity command injection vulnerability in Cisco Enterprise NFV Infrastructure Software, published on 24 Jan 2019. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2019-1656 in the wild and no public exploit code.

Affected product: Cisco Enterprise NFV Infrastructure Software. 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-2019-1656/ (Markdown: https://insights.sbomify.com/CVE-2019-1656/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-1656
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-1656
- OSV: https://osv.dev/vulnerability/CVE-2019-1656

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From sbomify Insights: https://insights.sbomify.com/CVE-2019-1656/
Summaries are generated and may contain mistakes; the official description above is the record.