CVE-2023-34108

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Summary

CVECVE-2023-34108
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2023-06-07 18:15:00 UTC
Updated2023-06-15 15:31:00 UTC
Descriptionmailcow 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=<valid-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.

Risk And Classification

Problem Types: NVD-CWE-noinfo

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Mailcow Mailcow _dockerized All All All

References

ReferenceSourceLinkTags
CVE_proposal/MailcowUserPassword.md at main · VladimirBorisov/CVE_proposal · GitHub MISC github.com
Manipulation of Internal Dovecot Variables in mailcow via crafted Passwords · Advisory · mailcow/mailcow-dockerized · GitHub MISC github.com
[Dovecot] remove pass return in Dovecot lua auth · mailcow/mailcow-dockerized@f80940e · GitHub MISC github.com
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