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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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