mailcow prior 2023-05a authorization

Summaryinfo

A vulnerability, which was classified as critical, has been found in mailcow. The impacted element is an unknown function. The manipulation leads to authorization. This vulnerability is traded as CVE-2023-34108. It is possible to initiate the attack remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in mailcow. It has been rated as critical. This issue affects an unknown functionality. The manipulation with an unknown input leads to a authorization vulnerability. Using CWE to declare the problem leads to CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

mailcow is a mail server suite based on Dovecot, Postfix and other open source software, that provides a modern web UI for user/server administration. A vulnerability has been discovered in mailcow which allows an attacker to manipulate internal Dovecot variables by using specially crafted passwords during the authentication process. The issue arises from the behavior of the `passwd-verify.lua` script, which is responsible for verifying user passwords during login attempts. Upon a successful login, the script returns a response in the format of "password=", indicating the successful authentication. By crafting a password with additional key-value pairs appended to it, an attacker can manipulate the returned string and influence the internal behavior of Dovecot. For example, using the password "123 mail_crypt_save_version=0" would cause the `passwd-verify.lua` script to return the string "password=123 mail_crypt_save_version=0". Consequently, Dovecot will interpret this string and set the internal variables accordingly, leading to unintended consequences. This vulnerability can be exploited by an authenticated attacker who has the ability to set their own password. Successful exploitation of this vulnerability could result in unauthorized access to user accounts, bypassing security controls, or other malicious activities. This issue has been patched in version `2023-05a`. Users are advised to upgrade. There are no known workarounds for this vulnerability.

The weakness was shared 06/07/2023 as GHSA-mhh4-qchc-pv22. The advisory is shared at github.com. The identification of this vulnerability is CVE-2023-34108 since 05/25/2023. Neither technical details nor an exploit are publicly available.

Upgrading to version 2023-05a eliminates this vulnerability. Applying the patch f80940efdccd393bf5fccec2886795372a38c445 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Name

• mailcow

License

• open-source

CPE 2.3info

• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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