==========================================================================
Ubuntu Security Notice USN-6901-1
July 18, 2024

stunnel vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

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.

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

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

Ubuntu 6901-1: stunnel Security Advisory Updates

July 18, 2024
stunnel could allow unintended access to network services.

Summary

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS 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.

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
Ubuntu Security Notice USN-6901-1

Package Information

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

Related News

Defending Against Remote Code Execution in Google Chrome: A Critical Update
2 - 3 min read
Google Chrome, a widely used web browser, serves millions of internet users by connecting them to the online world. Unfortunately, severe
Navigating the Linux Kernel
2 - 4 min read
The Linux operating system, widely acclaimed for its robustness and security , recently received widespread media attention due to a significant
Staying a Step Ahead of Adversaries: Mitigating Chromium
2 - 4 min read
Google Chrome, one of the world's most widely used web browsers, has recently been scrutinized due to the discovery of multiple Chromium
Unmasking Cicada3301: Examining the Threat of the New Rust-Based Ransomware
2 - 4 min read
Ransomware has long been a severe threat to organizations and admins alike. Recently, cybersecurity researchers discovered a new variant called
Buffer Overflow Exploits in Linux: Origins, Impact, and Countermeasures
3 - 6 min read
Buffer overflow vulnerabilities have long been one of the biggest headaches in computer security, especially on Linux operating systems that power
8 Expert-Recommended Security Practices to Fortify Your Linux Systems
4 - 8 min read
As a Linux admin or an infosec professional, you understand how the security landscape changes due to evolving threats, newly discovered
Open Source Strategies for Enhancing Security in Digital Business Operations
5 - 9 min read
Digital transformation, powered by the principles of open-source security , is vital for businesses looking to excel in today's technology-driven
Microsoft Update Mayhem: Rescuing Linux Dual-Boot Systems from Secure Boot Woes
2 - 4 min read
Microsoft's recent patch, intended to strengthen Secure Boot defenses, has resulted in an unexpected setback for Linux-Windows dual-boot setups

Get the Latest News & Insights

Sign up to get the latest security news affecting Linux and open source delivered straight to your inbox.

© 2024 Guardian Digital, Inc All Rights Reserved