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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.0763
                   USN-4294-1: OpenSMTPD vulnerabilities
                               3 March 2020

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           OpenSMTPD
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Increased Privileges            -- Remote/Unauthenticated
                   Access Confidential Data        -- Existing Account      
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-8794 CVE-2020-8793 

Reference:         ESB-2020.0702

Original Bulletin: 
   https://usn.ubuntu.com/4294-1/

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USN-4294-1: OpenSMTPD vulnerabilities
2 March 2020

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

  o Ubuntu 19.10
  o Ubuntu 18.04 LTS

Summary

Several security issues were fixed in opensmtpd.

Software Description

  o 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

To update your system, please follow these instructions: https://
wiki.ubuntu.com/Security/Upgrades .

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

References

  o CVE-2020-8793
  o CVE-2020-8794

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