# CVE-2023-2283: Auth bypass in libssh

> Attackers can bypass authentication in libssh due to a logic error in signature verification, allowing unauthorized access.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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:** 26 May 2023
- **Updated:** 3 Nov 2025
- **Also known as:** CLSA-2024-1718787931, DEBIAN-CVE-2023-2283, GHSA-h9jw-g3xj-5hwg, UBUNTU-CVE-2023-2283

## What is CVE-2023-2283?

CVE-2023-2283 is a medium-severity authentication bypass vulnerability in Fedoraproject Fedora, published on 26 May 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability was found in libssh, where the authentication check of the connecting client can be bypassed in the`pki_verify_data_signature` function in memory allocation problems. This issue may happen if there is insufficient memory or the memory usage is limited. The problem is caused by the return value `rc,` which is initialized to SSH_ERROR and later rewritten to save the return value of the function call `pki_key_check_hash_compatible.` The value of the variable is not changed between this point and the cryptographic verification. Therefore any error between them calls `goto error` returning SSH_OK.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2023-2283?

It affects 3 products.


Products: Fedoraproject Fedora, Libssh Libssh, Redhat Enterprise Linux.

## How do I fix CVE-2023-2283?

Apply the vendor's patch.

## Is CVE-2023-2283 being exploited?

There is no known exploitation of CVE-2023-2283 in the wild and no public exploit code.

## Other vulnerabilities in Fedoraproject Fedora

- [CVE-2024-4577](https://insights.sbomify.com/CVE-2024-4577/): PHP-CGI OS Command Injection (critical 9.8, exploited in the wild)
- [CVE-2021-39226](https://insights.sbomify.com/CVE-2021-39226/): Grafana Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2019-5544](https://insights.sbomify.com/CVE-2019-5544/): VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild)
- [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-2283 and fix it if it is affected.

What it is: CVE-2023-2283 is a medium-severity authentication bypass vulnerability in Fedoraproject Fedora, published on 26 May 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-2023-2283 in the wild and no public exploit code.

Affected product: Fedoraproject Fedora. 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-2023-2283/ (Markdown: https://insights.sbomify.com/CVE-2023-2283/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-2283
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-2283
- OSV: https://osv.dev/vulnerability/CVE-2023-2283

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-2283/
Summaries are generated and may contain mistakes; the official description above is the record.