CVE-2021-41109 : Exploit Details and Defense Strategies

Parse Server prior to version 4.10.4 exposes user session tokens in LiveQuery payloads, which can lead to the unauthorized exposure of sensitive information.

Understanding CVE-2021-41109

Parse Server vulnerability allowing LiveQuery to publish user session tokens.

What is CVE-2021-41109?

Parse Server, an open-source backend, disclosed user session tokens in LiveQuery payloads pre version 4.10.4, posing a confidentiality risk.

The Impact of CVE-2021-41109

Exposure of sensitive information to unauthorized actors via user session token broadcasting in LiveQuery payloads with a high severity CVSS score of 7.5.

Technical Details of CVE-2021-41109

Parse Server LiveQuery vulnerability details.

Vulnerability Description

Prior to version 4.10.4, Parse Server LiveQuery exposes user session tokens, breaching confidentiality.

Affected Systems and Versions

Product: parse-server
Vendor: parse-community
Versions affected: < 4.10.4

Exploitation Mechanism

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None

Mitigation and Prevention

Protecting systems from CVE-2021-41109.

Immediate Steps to Take

Upgrade to version 4.10.4 of Parse Server to patch the vulnerability.
Implement a workaround by setting

user.acl(new Parse.ACL())

in a beforeSave trigger.

Long-Term Security Practices

Regularly monitor and update Parse Server to the latest stable releases.
Educate users about best security practices and session token management.

Patching and Updates

Apply patches and updates promptly to mitigate the risk of exposure to sensitive data.