Executive Summary

Summary
Title OpenSMTPD vulnerabilities
Informations
Name USN-4294-1 First vendor Publication 2020-03-02
Vendor Ubuntu Last vendor Modification 2020-03-02
Severity (Vendor) N/A Revision N/A

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Overall CVSS Score 9.8
Base Score 9.8 Environmental Score 9.8
impact SubScore 5.9 Temporal Score 9.8
Exploitabality Sub Score 3.9
 
Attack Vector Network Attack Complexity Low
Privileges Required None User Interaction None
Scope Unchanged Confidentiality Impact High
Integrity Impact High Availability Impact High
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:C/I:C/A:C)
Cvss Base Score 10 Attack Range Network
Cvss Impact Score 10 Attack Complexity Low
Cvss Expoit Score 10 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 19.10 - Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in opensmtpd.

Software Description: - opensmtpd: secure, reliable, lean, and easy-to configure SMTP server

Details:

It was discovered that OpenSMTPD mishandled certain input. A remote, unauthenticated attacker could use this vulnerability to execute arbitrary shell commands as any non-root user. (CVE-2020-8794)

It was discovered that OpenSMTPD did not properly handle hardlinks under certain conditions. An unprivileged local attacker could read the first line of any file on the filesystem. (CVE-2020-8793)

Update instructions:

The problem can be corrected by updating your system to the following package versions:

Ubuntu 19.10:
opensmtpd 6.0.3p1-6ubuntu0.2

Ubuntu 18.04 LTS:
opensmtpd 6.0.3p1-1ubuntu0.2

In general, a standard system update will make all the necessary changes.

References:
https://usn.ubuntu.com/4294-1
CVE-2020-8793, CVE-2020-8794

Package Information:
https://launchpad.net/ubuntu/+source/opensmtpd/6.0.3p1-6ubuntu0.2
https://launchpad.net/ubuntu/+source/opensmtpd/6.0.3p1-1ubuntu0.2

Original Source

Url : http://www.ubuntu.com/usn/USN-4294-1

CWE : Common Weakness Enumeration

% Id Name
33 % CWE-426 Untrusted Search Path
33 % CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
33 % CWE-125 Out-of-bounds Read

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 1
Os 2
Os 2
Os 2

Snort® IPS/IDS

Date Description
2020-07-29 OpenSMTPD mta_io remote command injection attempt
RuleID : 54388 - Revision : 1 - Type : SERVER-OTHER
2020-07-02 OpenSMTPD mta_io remote command injection attempt
RuleID : 54122 - Revision : 1 - Type : SERVER-OTHER

Alert History

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0
1
Date Informations
2020-05-23 13:03:46
  • Multiple Updates
2020-03-02 21:18:22
  • First insertion