# CVE-2023-34101: Contiki-NG vulnerable to out-of-bounds read when processing ICMP DAO input

> An attacker can trigger an out-of-bounds read in Contiki-NG by sending truncated ICMP DAO packets, potentially exposing sensitive memory contents.

- **Severity:** High 7.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Jun 2023
- **Updated:** 30 Dec 2024
- **Also known as:** GHSA-fp66-ff6x-7w2w

## What is CVE-2023-34101?

CVE-2023-34101 is a high-severity vulnerability in contiki-ng, published on 14 Jun 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Contiki-NG is an operating system for internet of things devices. In version 4.8 and prior, when processing ICMP DAO packets in the `dao_input_storing` function, the Contiki-NG OS does not verify that the packet buffer is big enough to contain the bytes it needs before accessing them. Up to 16 bytes can be read out of bounds in the `dao_input_storing` function. An attacker can truncate an ICMP packet so that it does not contain enough data, leading to an out-of-bounds read on these lines. The problem has been patched in the "develop" branch of Contiki-NG, and is expected to be included in release 4.9. As a workaround, one can apply the changes in Contiki-NG pull request #2435 to patch the system.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2023-34101?

It affects 1 product.


Products: Contiki-Ng Contiki-Ng.

## How do I fix CVE-2023-34101?

No fix has been published for CVE-2023-34101 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-34101 being exploited?

There is no known exploitation of CVE-2023-34101 in the wild and no public exploit code.

## Other vulnerabilities in contiki-ng

- [CVE-2018-19417](https://insights.sbomify.com/CVE-2018-19417/): Memory corruption in n/a (critical 10.0)
- [CVE-2023-30546](https://insights.sbomify.com/CVE-2023-30546/): Contiki-NG has off-by-one error in Antelope DBMS (critical 9.8)
- [CVE-2020-24336](https://insights.sbomify.com/CVE-2020-24336/): Memory corruption in n/a (critical 9.8)
- [CVE-2020-14934](https://insights.sbomify.com/CVE-2020-14934/): Memory corruption in n/a (critical 9.8)
- [CVE-2020-14935](https://insights.sbomify.com/CVE-2020-14935/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-34101 and fix it if it is affected.

What it is: CVE-2023-34101 is a high-severity vulnerability in contiki-ng, published on 14 Jun 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-34101 in the wild and no public exploit code.

Affected product: contiki-ng. 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-2023-34101/ (Markdown: https://insights.sbomify.com/CVE-2023-34101/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-34101
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-34101
- OSV: https://osv.dev/vulnerability/CVE-2023-34101

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-34101/
Summaries are generated and may contain mistakes; the official description above is the record.