CVE-2020-11000

GreenBrowser before version 1.2 has a vulnerability where apps that rely on URL Parsing to verify that a given URL is pointing to a trust server may be susceptible to many different ways to get URL parsing and verification wrong, which allows an attacker to circumvent the access control. This problem has been patched in version 1.2.

Weakness

The product uses a handler for a custom URL scheme, but it does not properly restrict which actors can invoke the handler using the scheme.

Affected Software

Potential Mitigations

• Utilize a user prompt pop-up to authorize potentially harmful actions such as those modifying data or dealing with sensitive information.
• When designing functionality of actions in the URL scheme, consider whether the action should be accessible to all mobile applications, or if an allowlist of applications to interface with is appropriate.

References

• https://github.com/luchua-bc/GreenBrowser/commit/5e257e0db4f2a08cf05f00756e5961ee873e481b
• https://github.com/luchua-bc/GreenBrowser/security/advisories/GHSA-7x3j-7x5w-8g7w
• https://github.com/luchua-bc/GreenBrowser/commit/5e257e0db4f2a08cf05f00756e5961ee873e481b
• https://github.com/luchua-bc/GreenBrowser/security/advisories/GHSA-7x3j-7x5w-8g7w