CVE-2024-23838: truelayer.net SSRF — Fix

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.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Weakness Type (CWE)

CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Vendor	Product	Versions
truelayer	truelayer.net	< 1.6.0

References

Advisories & Patches

https://github.com/TrueLayer/truelayer-dotnet/commit/75e436ed5360faa73d6e7ce3a9903a3c49505e3e https://github.com/TrueLayer/truelayer-dotnet/security/advisories/GHSA-67m4-qxp3-j6hh https://github.com/TrueLayer/truelayer-dotnet/commit/75e436ed5360faa73d6e7ce3a9903a3c49505e3e https://github.com/TrueLayer/truelayer-dotnet/security/advisories/GHSA-67m4-qxp3-j6hh

Frequently Asked Questions

What is CVE-2024-23838? +

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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2024-23838? +

CVE-2024-23838 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2024-23838? +

CVE-2024-23838 affects products from truelayer, specifically: truelayer.net. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-23838? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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