Dovecot Vulnerability: Impersonation Risk Due to Client Certificate Handling
Summary
ALPINE-CVE-2019-3814: It was discovered that Dovecot before versions 2.2.36.1 and 2.3.4.1 incorrectly handled client certificates. Affects dovecot versions < 2.3.4.1-r0. Fixed in 2.3.4.1-r0. How to fix ↓
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Background
Dovecot is an open-source IMAP and POP3 server for Unix-like operating systems, designed to provide secure and efficient email retrieval. It is widely used for its performance and ease of integration with various email clients. However, a vulnerability has been identified in Dovecot that affects its handling of client certificates, potentially allowing unauthorized user impersonation.
Vulnerability Detail
The vulnerability arises from Dovecot's improper handling of client certificates prior to versions 2.2.36.1 and 2.3.4.1. A remote attacker possessing a valid certificate with an empty username field could exploit this flaw to impersonate other users, leading to unauthorized access to sensitive information. This issue highlights the importance of robust certificate validation mechanisms in secure communications.
How To Fix
Minimum fixed version
2.3.4.1-r0
This is the first release that contains the fix.
sudo apk add --upgrade dovecotTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, consider disabling client certificate authentication until the package can be updated. This can be done by modifying the Dovecot configuration file to prevent the use of client certificates.
Conclusion
The Dovecot vulnerability related to client certificate handling poses a significant risk of user impersonation. It is crucial for users to update to the patched versions to mitigate this risk. Additionally, utilizing tools like Vulert can help in monitoring and managing vulnerabilities effectively.
See every vulnerability recorded for dovecot →
FAQ
The CVSS score of this vulnerability is 6.8, indicating a medium severity level.
Dovecot versions prior to 2.2.36.1 and 2.3.4.1 are affected by this vulnerability.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without requiring any signup.
If exploited, this vulnerability could allow an attacker to impersonate other users, potentially leading to unauthorized access to sensitive data.
Yes, Vulert can monitor and alert you in real-time for open-source vulnerabilities in your software using just a manifest file like package-lock.json.
References
Related vulnerabilities
Recent vulnerabilities recorded for dovecot.
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