# CVE-2023-41097: Potential Timing vulnerability in CBC PKCS7 padding calculations

> Timing discrepancies in CBC PKCS7 padding allow padding oracle attacks, potentially exposing encrypted data in Silicon Labs GSDK.

- **Severity:** Medium 4.6 (`CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 21 Dec 2023
- **Updated:** 23 Apr 2025
- **Also known as:** GHSA-67c4-7f3g-r556

## What is CVE-2023-41097?

CVE-2023-41097 is a medium-severity vulnerability in silabs.com GSDK, published on 21 Dec 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

An Observable Timing Discrepancy, Covert Timing Channel vulnerability in Silabs GSDK on ARM potentially allows Padding Oracle Crypto Attack on CBC PKCS7.This issue affects GSDK: through 4.4.0.

Weakness: CWE-203 (Observable Discrepancy), CWE-327 (Use of a Broken or Risky Cryptographic Algorithm), CWE-208 (Observable Timing Discrepancy)

## Which versions are affected by CVE-2023-41097?

It affects 1 product.


Products: Silabs Gecko Software Development Kit.

## How do I fix CVE-2023-41097?

No fix has been published for CVE-2023-41097 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-41097 being exploited?

There is no known exploitation of CVE-2023-41097 in the wild and no public exploit code.

## Other vulnerabilities in silabs.com GSDK

- [CVE-2023-45318](https://insights.sbomify.com/CVE-2023-45318/): Memory corruption in Gecko Platform (critical 10.0)
- [CVE-2023-2686](https://insights.sbomify.com/CVE-2023-2686/): Memory corruption in Gecko Platform (critical 9.8)
- [CVE-2023-4280](https://insights.sbomify.com/CVE-2023-4280/): Unvalidated input in Silicon Labs TrustZone implementation leads to accessing Trusted memory region (critical 9.3)
- [CVE-2023-4020](https://insights.sbomify.com/CVE-2023-4020/): Unvalidated input in Silicon Labs PSA Attestation service leads to secure memory access from non-secure memory (critical 9.0)
- [CVE-2023-25181](https://insights.sbomify.com/CVE-2023-25181/): Memory corruption in Cesium NET (critical 9.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-41097 and fix it if it is affected.

What it is: CVE-2023-41097 is a medium-severity vulnerability in silabs.com GSDK, published on 21 Dec 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-41097 in the wild and no public exploit code.

Affected product: silabs.com GSDK. 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-2023-41097/ (Markdown: https://insights.sbomify.com/CVE-2023-41097/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-41097
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-41097
- OSV: https://osv.dev/vulnerability/CVE-2023-41097

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-41097/
Summaries are generated and may contain mistakes; the official description above is the record.