SB2022072744 - Multiple vulnerabilities in Discourse

Description

This security bulletin contains information about 2 vulnerabilities.

1) Improper access control (CVE-ID: CVE-2022-31184)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper access control in the update_activate_email route when handling email activation requests. A remote attacker can send repeated crafted requests to bypass the existing rate limit and cause a denial of service.

User interaction is required to trigger the spam signup emails.

2) Use of Web Browser Cache Containing Sensitive Information (CVE-ID: CVE-2022-31182)

CWE-ID: CWE-525 - Use of Web Browser Cache Containing Sensitive Information

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper cache control in Discourse's default NGINX proxy configuration when handling maliciously formed requests for static assets. A remote attacker can send a specially crafted request to cause a denial of service.

Error responses for static assets may be cached.

Remediation

Install update from vendor's website.

References

• https://github.com/discourse/discourse/security/advisories/GHSA-m5w9-8gp8-2hrf
• https://github.com/discourse/discourse/security/advisories/GHSA-4ff8-3j78-w6pp