CVE-2022-31014
SMTP Command Injection in iCalendar Attachments to emails via newlines in Nextcloud Server
In short
Nextcloud Server allows attackers to inject malicious SMTP commands through iCalendar email attachments by using newline characters. This could let them send unauthorized emails or modify email headers after authentication.
Technical detail
SMTP command injection vulnerability in Nextcloud Server via unsanitized newlines in iCalendar attachments. An authenticated attacker can inject arbitrary SMTP commands into email content, potentially hijacking SMTP sessions to send emails, spoof sender addresses, or execute other commands supported by the backend SMTP server. Mitigation requires input sanitization and server upgrade to versions 22.2.8, 23.0.5, or 24.0.1.
Summary generated and translated by AI from the official description.
Nextcloud server is an open source personal cloud server. Affected versions were found to be vulnerable to SMTP command injection. The impact varies based on which commands are supported by the backend SMTP server. However, the main risk here is that the attacker can then hijack an already-authenticated SMTP session and run arbitrary SMTP commands as the email user, such as sending emails to other users, changing the FROM user, and so on. As before, this depends on the configuration of the server itself, but newlines should be sanitized to mitigate such arbitrary SMTP command injection. It is recommended that the Nextcloud Server is upgraded to 22.2.8 , 23.0.5 or 24.0.1. There are no known workarounds for this issue.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Affected products
nextcloud · security-advisoriesWant to know if your infrastructure is exposed to this?
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