# CVE-2018-1000097: Memory corruption in n/a

> A buffer overflow in Sharutils allows attackers to execute arbitrary code if a victim processes a specially crafted file with the unshar command.

- **Severity:** High 7.8 (`CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 13 Mar 2018
- **Updated:** 5 Aug 2024
- **Also known as:** AZL-35251, AZL-6876, DEBIAN-CVE-2018-1000097, DSA-4167-1, GHSA-vp78-rw8x-8cfq, UBUNTU-CVE-2018-1000097, USN-3605-1, openSUSE-SU-2024:11380-1

## What is CVE-2018-1000097?

CVE-2018-1000097 is a high-severity memory corruption vulnerability in Canonical Ubuntu Linux, published on 13 Mar 2018. 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

Sharutils sharutils (unshar command) version 4.15.2 contains a Buffer Overflow vulnerability in Affected component on the file unshar.c at line 75, function looks_like_c_code. Failure to perform checking of the buffer containing input line. that can result in Could lead to code execution. This attack appear to be exploitable via Victim have to run unshar command on a specially crafted file..

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2018-1000097?

It affects 3 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `sharutils` | openSUSE:Tumbleweed | All versions | 4.15.2-6.9 |

Products: Canonical Ubuntu Linux, Debian Debian Linux, Gnu Sharutils.

## How do I fix CVE-2018-1000097?

Apply the vendor's patch.

## Is CVE-2018-1000097 being exploited?

There is no known exploitation of CVE-2018-1000097 in the wild and no public exploit code.

## 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-2018-1000097 and fix it if it is affected.

What it is: CVE-2018-1000097 is a high-severity memory corruption vulnerability in Canonical Ubuntu Linux, published on 13 Mar 2018. 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-2018-1000097 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-2018-1000097/ (Markdown: https://insights.sbomify.com/CVE-2018-1000097/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-1000097
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-1000097
- OSV: https://osv.dev/vulnerability/CVE-2018-1000097

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-1000097/
Summaries are generated and may contain mistakes; the official description above is the record.