# CVE-2017-7358: Path traversal in n/a

> Local attackers can escalate privileges to root via directory traversal in LightDM guest account script during logout.

- **Severity:** High 7.3 (`CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 5 Apr 2017
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-487j-vfqw-h49x, UBUNTU-CVE-2017-7358, USN-3255-1

## What is CVE-2017-7358?

CVE-2017-7358 is a high-severity path traversal vulnerability in Canonical Ubuntu Linux, published on 5 Apr 2017. 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

In LightDM through 1.22.0, a directory traversal issue in debian/guest-account.sh allows local attackers to own arbitrary directory path locations and escalate privileges to root when the guest user logs out.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2017-7358?

It affects 2 products.


Products: Canonical Ubuntu Linux, Lightdm Project Lightdm.

## How do I fix CVE-2017-7358?

Apply the vendor's patch.

## Is CVE-2017-7358 being exploited?

There is no known exploitation of CVE-2017-7358 in the wild and no public exploit code.

Public exploit code:

- LightDM (Ubuntu 16.04/16.10) - 'Guest Account' Local Privilege Escalation (exploitdb)
- https://github.com/JonPichel/CVE-2017-7358 (github_poc): https://github.com/JonPichel/CVE-2017-7358

## Other vulnerabilities in Canonical Ubuntu Linux

- [CVE-2020-11651](https://insights.sbomify.com/CVE-2020-11651/): SaltStack Salt Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2020-7247](https://insights.sbomify.com/CVE-2020-7247/): OpenSMTPD Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2019-16928](https://insights.sbomify.com/CVE-2019-16928/): Exim Out-of-bounds Write (critical 9.8, exploited in the wild)
- [CVE-2018-6789](https://insights.sbomify.com/CVE-2018-6789/): Exim Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2015-2590](https://insights.sbomify.com/CVE-2015-2590/): Oracle Java SE and Java SE Embedded Remote Code Execution (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-7358 and fix it if it is affected.

What it is: CVE-2017-7358 is a high-severity path traversal vulnerability in Canonical Ubuntu Linux, published on 5 Apr 2017. 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-2017-7358 in the wild and no public exploit code.

Affected product: Canonical Ubuntu Linux. 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-2017-7358/ (Markdown: https://insights.sbomify.com/CVE-2017-7358/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-7358
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-7358
- OSV: https://osv.dev/vulnerability/CVE-2017-7358

---
From sbomify Insights: https://insights.sbomify.com/CVE-2017-7358/
Summaries are generated and may contain mistakes; the official description above is the record.