# CVE-2018-18065: Null dereference in n/a

> An authenticated attacker can crash the Net-SNMP agent remotely via a crafted UDP packet due to a null pointer dereference.

- **Severity:** Medium 6.5 (`CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 8 Oct 2018
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2018-18065, DLA-1540-1, DSA-4314-1, GHSA-j2x7-g8jc-3475, SUSE-SU-2018:3319-1, SUSE-SU-2018:3333-1, SUSE-SU-2018:3447-1, SUSE-SU-2018:3447-2, UBUNTU-CVE-2018-18065, USN-3792-1

## What is CVE-2018-18065?

CVE-2018-18065 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 8 Oct 2018. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

_set_key in agent/helpers/table_container.c in Net-SNMP before 5.8 has a NULL Pointer Exception bug that can be used by an authenticated attacker to remotely cause the instance to crash via a crafted UDP packet, resulting in Denial of Service.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2018-18065?

It affects 10 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `net-snmp` | SUSE:Enterprise Storage 4 | All versions | 5.7.3-6.3.1 |
| `net-snmp` | SUSE:Linux Enterprise Desktop 12 SP3 | All versions | 5.7.3-6.3.1 |
| `net-snmp` | SUSE:Linux Enterprise Module for Basesystem 15 | All versions | 5.7.3-7.3.1 |
| `net-snmp` | SUSE:Linux Enterprise Server 12 SP1-LTSS | All versions | 5.7.3-6.3.1 |
| `net-snmp` | SUSE:Linux Enterprise Server 12 SP2-BCL | All versions | 5.7.3-6.3.1 |
| `net-snmp` | SUSE:Linux Enterprise Server 12 SP2-LTSS | All versions | 5.7.3-6.3.1 |
| `net-snmp` | SUSE:Linux Enterprise Server 12 SP3 | All versions | 5.7.3-6.3.1 |
| `net-snmp` | SUSE:Linux Enterprise Server 12-LTSS | All versions | 5.7.2.1-4.9.1 |
| `net-snmp` | SUSE:Linux Enterprise Server for SAP Applications 12 SP1 | All versions | 5.7.3-6.3.1 |
| `net-snmp` | SUSE:Linux Enterprise Server for SAP Applications 12 SP2 | All versions | 5.7.3-6.3.1 |
| `net-snmp` | SUSE:Linux Enterprise Server for SAP Applications 12 SP3 | All versions | 5.7.3-6.3.1 |
| `net-snmp` | SUSE:Linux Enterprise Software Development Kit 12 SP3 | All versions | 5.7.3-6.3.1 |
| `net-snmp` | SUSE:OpenStack Cloud 7 | All versions | 5.7.3-6.3.1 |

Products: Canonical Ubuntu Linux, Debian Debian Linux, Net-Snmp Net-Snmp, Netapp Cloud Backup, Netapp Data Ontap, Netapp E-Series Santricity Os Controller, Netapp Hyper Converged Infrastructure, Netapp Solidfire Element Os, Netapp Storagegrid Webscale, Paloaltonetworks Pan-Os.

## How do I fix CVE-2018-18065?

Upgrade to a fixed version.

## Is CVE-2018-18065 being exploited?

There is no known exploitation of CVE-2018-18065 in the wild and no public exploit code.

Public exploit code:

- net-snmp 5.7.3 - (Authenticated) Denial of Service (PoC) (exploitdb)

## 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-2018-18065 and fix it if it is affected.

What it is: CVE-2018-18065 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 8 Oct 2018. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2018-18065 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-2018-18065/ (Markdown: https://insights.sbomify.com/CVE-2018-18065/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-18065
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-18065
- OSV: https://osv.dev/vulnerability/CVE-2018-18065

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-18065/
Summaries are generated and may contain mistakes; the official description above is the record.