# CVE-2023-43662: Arbitrary file read vulnerability in Shoko Server

> Unauthenticated attackers can read arbitrary files on Shoko Server via an unsanitized path parameter in the image API endpoint.

- **Severity:** High 8.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 Sep 2023
- **Updated:** 23 Sep 2024
- **Also known as:** GHSA-mwcv-ghjq-8f2g

## What is CVE-2023-43662?

CVE-2023-43662 is a high-severity path traversal vulnerability in ShokoAnime ShokoServer, published on 28 Sep 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

ShokoServer is a media server which specializes in organizing anime. In affected versions the `/api/Image/WithPath` endpoint is accessible without authentication and is supposed to return default server images. The endpoint accepts the parameter `serverImagePath`, which is not sanitized in any way before being passed to `System.IO.File.OpenRead`, which results in an arbitrary file read. This issue may lead to an arbitrary file read which is exacerbated in the windows installer which installs the ShokoServer as administrator. Any unauthenticated attacker may be able to access sensitive information and read files stored on the server. The `/api/Image/WithPath` endpoint has been removed in commit `6c57ba0f0` which will be included in subsequent releases. Users should limit access to the `/api/Image/WithPath` endpoint or manually patch their installations until a patched release is made. This issue was discovered by the GitHub Security lab and is also indexed as GHSL-2023-191.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2023-43662?

It affects 1 product.


Products: Shokoanime Shokoserver.

## How do I fix CVE-2023-43662?

No fix has been published for CVE-2023-43662 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-43662 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-43662 exists.

Public exploit code:

- ShokoServer System - Local File Inclusion (LFI) (nuclei): http/cves/2023/CVE-2023-43662.yaml

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-43662 and fix it if it is affected.

What it is: CVE-2023-43662 is a high-severity path traversal vulnerability in ShokoAnime ShokoServer, published on 28 Sep 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-43662 exists.

Affected product: ShokoAnime ShokoServer. 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-2023-43662/ (Markdown: https://insights.sbomify.com/CVE-2023-43662/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-43662
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-43662
- OSV: https://osv.dev/vulnerability/CVE-2023-43662

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From sbomify Insights: https://insights.sbomify.com/CVE-2023-43662/
Summaries are generated and may contain mistakes; the official description above is the record.