Critical Bash Vulnerability in Red Hat Enterprise Linux 8: Security Advisory RHSA-2021:1679
Summary
RHSA-2021:1679: Red Hat Security Advisory: bash security and bug fix update. Affects bash versions < 0:4.4.19-14.el8. Fixed in 0:4.4.19-14.el8. How to fix ↓
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Background
Bash is a widely used command-line shell and scripting language in Unix-based systems, including Red Hat Enterprise Linux 8. It provides users with a command-line interface to interact with the operating system, execute commands, and automate tasks through scripts. The package is essential for system administration and user operations, making its security paramount. The vulnerability identified in this advisory affects the bash package, which is integral to system functionality and security.
Vulnerability Detail
The vulnerability, identified as CVE-2019-18276, originates from a flaw in the Bash shell that could allow an attacker to execute arbitrary code. This vulnerability poses significant risks, including unauthorized access to sensitive data and potential system compromise. The CVSS score of this vulnerability is 7.8, indicating a high severity level. The flaw can be exploited if a user runs a malicious script or command, leading to potential data loss or system integrity issues.
How To Fix
Minimum fixed version
0:4.4.19-14.el8
This is the first release that contains the fix.
sudo dnf update bashTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary measure, users can avoid executing untrusted scripts or commands in the Bash shell until the package is updated. Additionally, restricting user permissions and implementing strict access controls can help minimize exposure to potential exploits.
Conclusion
The vulnerability in the Bash package of Red Hat Enterprise Linux 8 poses significant security risks, including the potential for arbitrary code execution. It is crucial for users to update their systems to the patched version to mitigate these risks. Employing best practices for script execution and user permissions can further enhance security.
See every vulnerability recorded for bash →
FAQ
CVE-2019-18276 is a vulnerability in the Bash shell that allows for arbitrary code execution, posing significant security risks.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
The CVSS score of this vulnerability is 7.8, indicating a high level of severity.
If immediate updates are not possible, avoid running untrusted scripts and limit user permissions to reduce the risk of exploitation.
Detailed information can be found in the Red Hat Security Advisory RHSA-2021:1679 at https://security.access.redhat.com/data/osv/RHSA-2021:1679.json.
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