What is the severity of USN-6901-1?

The severity of USN-6901-1 is considered high due to the potential for sensitive information exposure by remote attackers.

How do I fix USN-6901-1?

To fix USN-6901-1, update the stunnel4 package to either version 3:5.56-1ubuntu0.2 for Ubuntu 20.04 or 3:5.44-1ubuntu3+esm1 for Ubuntu 18.04.

What vulnerabilities does USN-6901-1 address?

USN-6901-1 addresses a vulnerability in stunnel related to improper validation of client certificates when using redirect and verifyChain options.

Who is affected by USN-6901-1?

USN-6901-1 affects users of stunnel4 on Ubuntu 20.04 and 18.04 who have configured both the redirect and verifyChain options.

What is the risk of not addressing USN-6901-1?

Not addressing USN-6901-1 may allow remote attackers to exploit the vulnerability and obtain sensitive information through the tunneled service.

Vulnerability/
USN-6901-1

18/7/2024

USN-6901-1: stunnel vulnerability

First published: Thu Jul 18 2024(Updated: )

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.

Affected Software	Affected Version	How to fix
All of
ubuntu/stunnel4	<3:5.56-1ubuntu0.2	3:5.56-1ubuntu0.2
Ubuntu	=20.04
All of
ubuntu/stunnel4	<3:5.44-1ubuntu3+esm1	3:5.44-1ubuntu3+esm1
Ubuntu	=18.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

CVE-2021-20230

Frequently Asked Questions

What is the severity of USN-6901-1?
The severity of USN-6901-1 is considered high due to the potential for sensitive information exposure by remote attackers.
How do I fix USN-6901-1?
To fix USN-6901-1, update the stunnel4 package to either version 3:5.56-1ubuntu0.2 for Ubuntu 20.04 or 3:5.44-1ubuntu3+esm1 for Ubuntu 18.04.
What vulnerabilities does USN-6901-1 address?
USN-6901-1 addresses a vulnerability in stunnel related to improper validation of client certificates when using redirect and verifyChain options.
Who is affected by USN-6901-1?
USN-6901-1 affects users of stunnel4 on Ubuntu 20.04 and 18.04 who have configured both the redirect and verifyChain options.
What is the risk of not addressing USN-6901-1?
Not addressing USN-6901-1 may allow remote attackers to exploit the vulnerability and obtain sensitive information through the tunneled service.

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