# CVE-2018-19637: Static temporary filename allows overwriting of files

> Local attackers can overwrite arbitrary files by exploiting a static temporary filename in SUSE supportutils, requiring an upgrade to fix.

- **Severity:** Low 2.8 (`CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N`)
- **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 Mar 2019
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-9w5f-7xrh-r828

## What is CVE-2018-19637?

CVE-2018-19637 is a low-severity path traversal vulnerability in SUSE supportutils, published on 5 Mar 2019. 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

Supportutils, before version 3.1-5.7.1, wrote data to static file /tmp/supp_log, allowing local attackers to overwrite files on systems without symlink protection

Weakness: CWE-59 (Improper Link Resolution Before File Access), CWE-377 (DEPRECATED: Insecure Temporary File)

## Which versions are affected by CVE-2018-19637?

It affects 1 product.


Products: Opensuse Supportutils.

## How do I fix CVE-2018-19637?

Upgrade to a fixed version.

## Is CVE-2018-19637 being exploited?

There is no known exploitation of CVE-2018-19637 in the wild and no public exploit code.

## Other vulnerabilities in SUSE supportutils

- [CVE-2018-19636](https://insights.sbomify.com/CVE-2018-19636/): Local root exploit via inclusion of attacker controlled shell script (high 7.3)
- [CVE-2018-19639](https://insights.sbomify.com/CVE-2018-19639/): Code execution if run with command line switch -v (medium 6.7)
- [CVE-2022-45154](https://insights.sbomify.com/CVE-2022-45154/): supportconfig does not remove passwords in /etc/iscsi/iscsid.conf and /etc/target/lio_setup.sh (medium 4.4)
- [CVE-2018-19640](https://insights.sbomify.com/CVE-2018-19640/): Code execution if run with command line switch -v (medium 4.4)
- [CVE-2018-19638](https://insights.sbomify.com/CVE-2018-19638/): User can overwrite arbitrary log files in support tar (low 2.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-19637 and fix it if it is affected.

What it is: CVE-2018-19637 is a low-severity path traversal vulnerability in SUSE supportutils, published on 5 Mar 2019. 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-2018-19637 in the wild and no public exploit code.

Affected product: SUSE supportutils. 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-2018-19637/ (Markdown: https://insights.sbomify.com/CVE-2018-19637/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-19637
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-19637
- OSV: https://osv.dev/vulnerability/CVE-2018-19637

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-19637/
Summaries are generated and may contain mistakes; the official description above is the record.