GHSA-7v7m-pcw5-h3cg

Suggest an improvement
Source
https://github.com/advisories/GHSA-7v7m-pcw5-h3cg
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/05/GHSA-7v7m-pcw5-h3cg/GHSA-7v7m-pcw5-h3cg.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-7v7m-pcw5-h3cg
Published
2024-05-20T17:49:10Z
Modified
2024-05-20T18:00:41.569301Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N CVSS Calculator
Summary
Pusher Service Channel Authentication Bypass
Details

The service offered by Pusher provides "private" channels with an authentication mechanism that restricts subscription access. The decision on allowing subscriptions to private channels is delegated to customers, who implement an authentication endpoint. End-users request a token from this endpoint to join a specific channel. The token is an HMAC signature of the end-user's connection ID (socket_id) and the desired channel.

The issue arises from a lack of validation in the libraries provided to customers. This vulnerability allows a malicious end-user to submit a malformed socket_id field, leading the customer to unknowingly sign a string. This signed string grants access to a different private channel than the one the end-user is ostensibly requesting. Consequently, a malicious end-user, with permission to subscribe to one private channel, can forge permission for any private channel owned by the same customer.

Additionally, the HTTP API is secured by requiring a signature with each request, generated by the customer's secret key. In specific cases, a malicious end-user may deceive a customer into signing a value for socket_id, effectively authenticating an API request to Pusher.

References

Affected packages

Packagist / pusher/pusher-php-server

Package

Name
pusher/pusher-php-server
Purl
pkg:composer/pusher/pusher-php-server

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.2.1

Affected versions

2.*

2.1.2

v2.*

v2.1.3
v2.2.0