CVE-2021-40347 : Vulnerability Insights and Analysis
Discover the impact of CVE-2021-40347, a vulnerability in GNU Mailman Postorius before 1.3.5, allowing unauthorized unsubscription of users from mailing lists and potential disclosure of email addresses.
This CVE record pertains to an issue found in GNU Mailman Postorius before version 1.3.5, allowing an attacker to unsubscribe users from a mailing list and potentially reveal subscriber email addresses.
Understanding CVE-2021-40347
This section provides insights into the nature of the CVE-2021-40347 vulnerability.
What is CVE-2021-40347?
CVE-2021-40347 is a vulnerability identified in views/list.py in GNU Mailman Postorius before version 1.3.5. It enables an attacker logged into any account to unsubscribe any user from a mailing list, and in the process, disclose if the address was previously subscribed.
The Impact of CVE-2021-40347
The vulnerability in GNU Mailman Postorius before 1.3.5 can have the following impacts:
- Unauthorized unsubscription of users from mailing lists
- Disclosure of subscriber email addresses
Technical Details of CVE-2021-40347
In this section, we delve into the technical aspects surrounding CVE-2021-40347.
Vulnerability Description
The flaw in GNU Mailman Postorius before 1.3.5 allows any logged-in attacker to execute a crafted POST request to remove users from mailing lists, potentially revealing their subscription status.
Affected Systems and Versions
- Affected System: GNU Mailman Postorius
- Affected Versions: Versions earlier than 1.3.5
Exploitation Mechanism
The vulnerability can be exploited by sending a specifically crafted POST request while authenticated in any account, leading to unauthorized unsubscriptions and potential disclosure of subscriber email addresses.
Mitigation and Prevention
This section presents measures to mitigate the CVE-2021-40347 vulnerability.
Immediate Steps to Take
To address CVE-2021-40347 immediately, the following steps are recommended:
- Update GNU Mailman Postorius to version 1.3.5 or newer
- Monitor mailing list subscriptions for any unauthorized changes
Long-Term Security Practices
For long-term security enhancement, consider the following practices:
- Regularly update software components to the latest secure versions
- Implement access controls to restrict unauthenticated/unauthorized access to mailing list management functionalities
Patching and Updates
Ensure timely application of security patches and updates provided by the GNU Mailman Postorius team to mitigate vulnerabilities.