CVE-2022-31014 SMTP Command Injection in iCalendar Attachments to emails via newlines in Nextcloud Server

2022-07-0517:15:12

CWE-93

CWE-74

GitHub_M

www.cve.org

smtp command injection

nextcloud server

vulnerability

email hijacking

server upgrade

CVSS3

5.4

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

AI Score

6.4

Confidence

High

EPSS

0.001

Percentile

35.4%

JSON

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.

CNA Affected

[
  {
    "product": "security-advisories",
    "vendor": "nextcloud",
    "versions": [
      {
        "status": "affected",
        "version": "< 22.2.8"
      },
      {
        "status": "affected",
        "version": ">= 23.0.0, < 23.0.5"
      },
      {
        "status": "affected",
        "version": ">= 24.0.0, < 24.0.1"
      }
    ]
  }
]