# CVE-2024-23838: TrueLayer.Client SSRF when fetching payment or payment provider

> A malicious actor can manipulate the destination URL in the TrueLayer .NET SDK, causing requests to internal or external resources and leading to information disclosure.

- **Severity:** High 8.6 (`CVSS:3.0/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:** Yes
- **Published:** 30 Jan 2024
- **Updated:** 23 Aug 2024
- **Also known as:** GHSA-67m4-qxp3-j6hh

## What is CVE-2024-23838?

CVE-2024-23838 is a high-severity server-side request forgery vulnerability in truelayer-dotnet, published on 30 Jan 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

TrueLayer.NET is the .Net client for TrueLayer.  The vulnerability could potentially allow a malicious actor to gain control over the destination URL of the HttpClient used in the API classes. For applications using the SDK, requests to unexpected resources on local networks or to the internet could be made which could lead to information disclosure. The issue can be mitigated by having strict egress rules limiting the destinations to which requests can be made, and applying strict validation to any user input passed to the `truelayer-dotnet` library. Versions of TrueLayer.Client `v1.6.0` and later are not affected.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2024-23838?

2 open source packages ship an affected version, including TrueLayer.Client. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `TrueLayer.Client` | NuGet | All versions | 1.6.0 |
| `TrueLayer.Client` | NuGet | All versions | 1.6.0 |

Products: Truelayer Truelayer.net.

## How do I fix CVE-2024-23838?

Upgrade TrueLayer.Client to 1.6.0 or later.

## Is CVE-2024-23838 being exploited?

There is no known exploitation of CVE-2024-23838 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-23838 and fix it if it is affected.

What it is: CVE-2024-23838 is a high-severity server-side request forgery vulnerability in truelayer-dotnet, published on 30 Jan 2024. 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-2024-23838 in the wild and no public exploit code.

Affected packages and fixed versions:
- TrueLayer.Client (NuGet): affected all versions; fixed in 1.6.0
- TrueLayer.Client (NuGet): affected all versions; fixed in 1.6.0

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-2024-23838/ (Markdown: https://insights.sbomify.com/CVE-2024-23838/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-23838
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-23838
- OSV: https://osv.dev/vulnerability/CVE-2024-23838

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-23838/
Summaries are generated and may contain mistakes; the official description above is the record.