A container privilege escalation flaw was found in certain Web Terminal images. This vulnerability allows attackers to leverage their membership in the root group to modify the /etc/passwd file, potentially gaining full root privileges within the container. The issue arises from the /etc/passwd file being created with group-writable permissions during build time.
The CVSS score for this vulnerability is 6.4, classifying it as medium severity. This rating indicates a risk to organizations that deploy affected Web Terminal images. Attackers may leverage this vulnerability to add new users with arbitrary UIDs, including UID 0, thus gaining elevated privileges.
Given the potential for privilege escalation, organizations should prioritize reviewing their deployment of affected Web Terminal images. The vulnerability was published on April 8, 2026, and the risk to organizations includes unauthorized access and system compromise.
Organizations should prioritize patching immediately to mitigate the risks associated with this vulnerability.
This vulnerability has not been actively exploited in the wild, and there are currently no known exploits available.
Organizations are encouraged to monitor for any updates from Red Hat and ensure that their security measures are adequate to defend against potential exploitation.
Vulnerability Details
This vulnerability allows attackers to gain elevated privileges within the container environment. The attack vector is local, and high privileges are required to exploit this flaw, as it involves modifying a system file. The CWE classification for this issue is CWE-276, indicating a permissions issue.
Technical Analysis
The root cause of this vulnerability stems from improper file permissions set during the build process of container images. The /etc/passwd file is created with group-writable permissions, which can be exploited by users who have been granted access to execute commands within the affected container.
The attack complexity is rated as high, meaning that the conditions for exploitation may not be easily met. However, if an attacker can run commands in the container, they can leverage this flaw to gain root access.
Risk & Impact Analysis
Risk to organizations includes unauthorized access and potential data compromise. The blast radius of this vulnerability can be significant if exploited, as it may grant attackers the ability to control the entire container environment. Given the CVSS score, organizations should address this vulnerability in their priority patch cycle.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected component is the Web Terminal from Red Hat. All versions prior to the vendor patch are impacted.
Mitigation & Remediation
Organizations should upgrade to the latest patched version of the Web Terminal. If immediate patching is not possible, consider implementing configuration hardening to restrict access to the container environment.
Monitoring for unusual activities and ensuring proper network controls are in place can further mitigate risk. For comprehensive security measures, organizations may consider penetration testing to identify potential weaknesses.
Detection Guidance
Organizations should monitor log indicators for unauthorized changes to the /etc/passwd file, which may indicate exploitation attempts. Behavioral anomalies such as unexpected user creation or privilege elevation should also be investigated.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability lies in its potential to expose organizations to significant risks if not addressed promptly. It highlights the importance of secure configurations in container environments and the need for continuous security assessments.
Security teams should take this as a lesson to regularly review their container permissions and implement robust security practices. For more insights on improving security posture, organizations can explore resources on vulnerability management and penetration testing methodology to enhance their overall security framework.
Staying updated with emerging threats is vital for maintaining a secure environment. Regular assessments and proactive measures will help mitigate vulnerabilities effectively.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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