CVE-2021-44141 is a medium-severity vulnerability affecting all versions of Samba prior to 4.15.5. This flaw allows a malicious client to utilize server symlinks to determine if a file or directory exists in areas of the server file system that are not exported under the share definition. For this attack to succeed, SMB1 with Unix extensions must be enabled. The CVSS score for this vulnerability is 4.3, indicating a medium risk level, which necessitates prompt attention from organizations.
Organizations face a risk of unauthorized access due to this vulnerability. The exploitation potential is significant, as attackers may leverage this flaw to access sensitive files or directories outside of intended access rights, leading to potential data exposure. Security teams should prioritize patching Samba installations to prevent exploitation.
Currently, there are no known exploits associated with CVE-2021-44141, but the nature of the vulnerability warrants vigilance. Organizations should monitor their Samba configurations and ensure that unnecessary services, such as SMB1, are disabled to minimize attack surfaces.
Given the moderate urgency associated with this vulnerability, organizations should address it within their priority patch cycle to ensure ongoing security and compliance.
Vulnerability Details
The official description of CVE-2021-44141 highlights that all versions of Samba prior to 4.15.5 are vulnerable to a malicious client leveraging a server symlink. This vulnerability allows checking for the existence of files or directories outside the defined share. The CVSS version 3.1 score of 4.3 categorizes it as medium severity, with a low attack complexity and requiring low privileges.
The affected products include Samba, Fedora, and Red Hat Storage, with the vulnerability disclosed on February 21, 2022. The common weaknesses enumerated for this vulnerability are CWE-200 (Information Exposure) and CWE-59 (Improper Link Resolution).
Technical Analysis
The root cause of CVE-2021-44141 lies in the improper handling of symlinks by the Samba server when SMB1 with Unix extensions is enabled. The attack vector is network-based, allowing remote attackers to exploit the vulnerability without requiring physical access to the server. The attack complexity is low, meaning that an attacker can exploit this vulnerability without significant effort or specialized knowledge.
The privileges required for exploitation are low, as attackers do not need elevated privileges to trigger the vulnerability. User interaction is not required, making this vulnerability particularly insidious. The confidentiality impact is classified as low, indicating that sensitive data could potentially be exposed without proper safeguards.
Integrity and availability impacts are assessed as none, suggesting that exploitation does not affect the integrity of the data or the availability of the system. Security teams should ensure that monitoring and logging are in place to detect any unusual access patterns that could indicate exploitation attempts.
Risk & Impact Analysis
The risk to organizations includes potential unauthorized access to sensitive files and directories, which can lead to data breaches and compliance violations. The blast radius is significant, as Samba is widely used in various environments, potentially affecting a large number of systems within an organization. Security teams should assess the impact of this vulnerability on their specific deployment and prioritize remediation efforts.
The urgency to address this vulnerability is moderate, and organizations should schedule remediation within their patch management cycles. Organizations that have not yet applied the necessary patches should take immediate action to prevent exploitation.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerability affects all versions of Samba prior to 4.15.5, as well as specific versions of Red Hat Storage and Fedora (versions 34 and 35). Organizations should ensure they are running the latest patched versions to mitigate risks.
Mitigation & Remediation
To mitigate the risks associated with CVE-2021-44141, organizations should upgrade to Samba version 4.15.5 or later. If patches are not immediately available, disabling SMB1 and Unix extensions can help reduce exposure. Monitoring for unusual access patterns and applying appropriate network controls are also recommended.
For further information on security practices, organizations should consider leveraging penetration testing services to identify potential vulnerabilities.
Detection Guidance
Security teams should monitor logs for indicators of unusual activity related to Samba access. Behavioral anomalies such as unexpected file access attempts or unauthorized directory listings may indicate attempts to exploit this vulnerability. Additionally, network signatures associated with Samba traffic should be analyzed for signs of exploitation.
AppSecure Threat Intelligence Insight
CVE-2021-44141 exemplifies the ongoing need for organizations to maintain up-to-date software and monitor for vulnerabilities. The low exploitability score and absence of known exploits should not lead to complacency. Security teams are encouraged to adopt a proactive stance on vulnerability management and consider the lessons learned from such vulnerabilities.
For a comprehensive approach to application security, organizations can explore resources like the vulnerability management program and the importance of continuous security assessments.
In the context of emerging threats, organizations should also stay informed on security best practices through our penetration testing methodology guides.
Organizations should also consider engaging with security experts to enhance their defensive posture against vulnerabilities like CVE-2021-44141.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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