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CCE
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CCE-91932-4

Platform: cpe:/o:ubuntu:ubuntu_linux:16.04Date: (C)2018-07-09   (M)2023-07-04



Mail Transfer Agents (MTA), such as sendmail and Postfix, are used to listen for incoming mail and transfer the messages to the appropriate user or mail server. If the system is not intended to be a mail server, it is recommended that the MTA be configured to only process local mail. Rationale: The software for all Mail Transfer Agents is complex and most have a long history of security issues. While it is important to ensure that the system can process local mail messages, it is not necessary to have the MTAs daemon listening on a port unless the server is intended to be a mail server that receives and processes mail from other systems. Note: The remediation given here provides instructions for configuring the postfix mail server, depending on your environment you may have an alternative MTA installed such as sendmail. If this is the case consult the documentation for your installed MTA to configure the recommended state.


Parameter:

[inet interface]


Technical Mechanism:

Edit /etc/postfix/main.cf and add the following line to the RECEIVING MAIL section. If the line already exists, change it to look like the line below. inet_interfaces = localhost Restart postfix: # service postfix restart

CCSS Severity:CCSS Metrics:
CCSS Score : 5.6Attack Vector: LOCAL
Exploit Score: 0.8Attack Complexity: LOW
Impact Score: 4.7Privileges Required: HIGH
Severity: MEDIUMUser Interaction: NONE
Vector: AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:LScope: UNCHANGED
 Confidentiality: HIGH
 Integrity: LOW
 Availability: LOW
  

References:
Resource IdReference
SCAP Repo OVAL Definitionoval:org.secpod.oval:def:46193


OVAL    1
oval:org.secpod.oval:def:46193
XCCDF    1
xccdf_org.secpod_benchmark_general_Ubuntu_16_04

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