Ubuntu 4294-1: OpenSMTPD vulnerabilities

    Date 02 Mar 2020
    Posted By LinuxSecurity Advisories
    Several security issues were fixed in opensmtpd.
    Ubuntu Security Notice USN-4294-1
    March 02, 2020
    OpenSMTPD vulnerabilities
    A security issue affects these releases of Ubuntu and its derivatives:
    - Ubuntu 19.10
    - Ubuntu 18.04 LTS
    Several security issues were fixed in opensmtpd.
    Software Description:
    - opensmtpd: secure, reliable, lean, and easy-to configure SMTP server
    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.
      CVE-2020-8793, CVE-2020-8794
    Package Information:

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