# CVE-2015-9096: Command injection in n/a

> Attackers can inject SMTP commands via CRLF sequences in Ruby's Net::SMTP library, potentially leading to code execution.

- **Severity:** Medium 6.1 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 12 Jun 2017
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-2h3c-5vqm-gqfh, UBUNTU-CVE-2015-9096

## What is CVE-2015-9096?

CVE-2015-9096 is a medium-severity command injection vulnerability in Ruby-Lang Ruby, published on 12 Jun 2017. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Net::SMTP in Ruby before 2.4.0 is vulnerable to SMTP command injection via CRLF sequences in a RCPT TO or MAIL FROM command, as demonstrated by CRLF sequences immediately before and after a DATA substring.

Weakness: CWE-93 (Improper Neutralization of CRLF Sequences)

## Which versions are affected by CVE-2015-9096?

It affects 1 product.


Products: Ruby-Lang Ruby.

## How do I fix CVE-2015-9096?

Upgrade to a fixed version.

## Is CVE-2015-9096 being exploited?

There is no known exploitation of CVE-2015-9096 in the wild and no public exploit code.

## Other vulnerabilities in Ruby-Lang Ruby

- [CVE-2009-4124](https://insights.sbomify.com/CVE-2009-4124/): Memory corruption in n/a (critical 10.0)
- [CVE-2022-28738](https://insights.sbomify.com/CVE-2022-28738/): Use after free in n/a (critical 9.8)
- [CVE-2011-4121](https://insights.sbomify.com/CVE-2011-4121/): Weak cryptography in OpenSSL extension of Ruby (Git trunk) (critical 9.8)
- [CVE-2017-17790](https://insights.sbomify.com/CVE-2017-17790/): Command injection in n/a (critical 9.8)
- [CVE-2017-11465](https://insights.sbomify.com/CVE-2017-11465/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2015-9096 and fix it if it is affected.

What it is: CVE-2015-9096 is a medium-severity command injection vulnerability in Ruby-Lang Ruby, published on 12 Jun 2017. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2015-9096 in the wild and no public exploit code.

Affected product: Ruby-Lang Ruby. 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-2015-9096/ (Markdown: https://insights.sbomify.com/CVE-2015-9096/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2015-9096
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2015-9096
- OSV: https://osv.dev/vulnerability/CVE-2015-9096

---
From sbomify Insights: https://insights.sbomify.com/CVE-2015-9096/
Summaries are generated and may contain mistakes; the official description above is the record.