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Ubuntu Security Notice USN-4294-1
March 02, 2020
OpenSMTPD vulnerabilities
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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
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