# CVE-2017-11343: Denial of service in n/a

> An attacker can cause denial of service in CHICKEN Scheme by providing crafted input that triggers inefficient symbol table lookups.

- **Severity:** High 7.5 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 16 Jul 2017
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2017-11343, GHSA-7945-x94j-3j4w, UBUNTU-CVE-2017-11343

## What is CVE-2017-11343?

CVE-2017-11343 is a high-severity denial of service vulnerability in n/a, published on 16 Jul 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Due to an incomplete fix for CVE-2012-6125, all versions of CHICKEN Scheme up to and including 4.12.0 are vulnerable to an algorithmic complexity attack. An attacker can provide crafted input which, when inserted into the symbol table, will result in O(n) lookup time.

Weakness: CWE-407 (Inefficient Algorithmic Complexity)

## Which versions are affected by CVE-2017-11343?

It affects 1 product.


Products: Call-Cc Chicken.

## How do I fix CVE-2017-11343?

Upgrade to a fixed version.

## Is CVE-2017-11343 being exploited?

There is no known exploitation of CVE-2017-11343 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2022-45145](https://insights.sbomify.com/CVE-2022-45145/): Command injection in n/a (critical 9.8)
- [CVE-2014-6310](https://insights.sbomify.com/CVE-2014-6310/): Memory corruption in n/a (critical 9.8)
- [CVE-2012-6125](https://insights.sbomify.com/CVE-2012-6125/): Denial of service in chicken (critical 9.8)
- [CVE-2016-6830](https://insights.sbomify.com/CVE-2016-6830/): Memory corruption in n/a (critical 9.8)
- [CVE-2013-2024](https://insights.sbomify.com/CVE-2013-2024/): Command injection in chicken (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-11343 and fix it if it is affected.

What it is: CVE-2017-11343 is a high-severity denial of service vulnerability in n/a, published on 16 Jul 2017. 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-2017-11343 in the wild and no public exploit code.

Affected product: n/a. 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-2017-11343/ (Markdown: https://insights.sbomify.com/CVE-2017-11343/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-11343
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-11343
- OSV: https://osv.dev/vulnerability/CVE-2017-11343

---
From sbomify Insights: https://insights.sbomify.com/CVE-2017-11343/
Summaries are generated and may contain mistakes; the official description above is the record.