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Ubuntu 20.04/18.04 LTS USN-6901-1: Stunnel Access Security Issue

ubuntu
Calendar Grey July 18, 2024
Dist Ubuntu Esm H88
Ubuntu Security Notice USN-6902-1 highlights a flaw in OpenSSH that could permit unauthorized remote access.
stunnel could allow unintended access to network services.

Summary

stunnel could allow unintended access to network services.

Software Description:

- stunnel4: Universal SSL tunnel for network daemons

Details:

It was discovered that stunnel did not properly validate client

certificates when configured to use both the redirect and verifyChain

options. A remote attacker could potentially use this issue to obtain

sensitive information by accessing the tunneled service.

Topics%20covered

Topics Covered

security advisory access control remote attack Ubuntu stunnel

Update Instructions

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

Ubuntu 20.04 LTS
   stunnel4                        3:5.56-1ubuntu0.2

Ubuntu 18.04 LTS
   stunnel4                        3:5.44-1ubuntu3+esm1
                                   Available with Ubuntu Pro

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

References

https://ubuntu.com/security/notices/USN-6901-1

CVE-2021-20230

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6901-1

Topics%20covered

Topics Covered

security advisory access control remote attack Ubuntu stunnel

Package Information

https://launchpad.net/ubuntu/+source/stunnel4/3:5.56-1ubuntu0.2

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