CVE-2021-44142 is a high-severity vulnerability affecting the Samba vfs_fruit module, which facilitates compatibility with Apple SMB clients. This vulnerability allows out-of-bounds heap read and write operations through specially crafted extended file attributes. Consequently, a remote attacker with write access to these attributes can execute arbitrary code with the privileges of the smbd process, typically root.
The CVSS score for this vulnerability is 8.8, indicating a high severity level. The attack vector is network-based, with low complexity and minimal privileges required for exploitation. This makes organizations particularly vulnerable, as attackers can exploit the flaw without sophisticated techniques.
Given the potential for significant impact, including complete control over affected systems, organizations should prioritize patching immediately. The affected Samba versions are prior to 4.13.17, 4.14.12, and 4.15.5.
The vulnerability was publicly disclosed on February 21, 2022. Organizations using Samba, especially those that operate in environments requiring interoperability with Apple systems, should implement the necessary patches to mitigate this vulnerability.
Vulnerability Details
The Samba vfs_fruit module leverages extended file attributes to enhance compatibility with Apple SMB clients and Netatalk 3 AFP fileservers. However, vulnerabilities in versions prior to 4.13.17, 4.14.12, and 4.15.5 allow attackers to read and write beyond allocated memory regions. This can be exploited remotely by attackers who possess write access to the extended file attributes.
This vulnerability's CVSS score of 8.8 categorizes it as high severity, indicating that it poses a substantial risk to organizations. The impacts on confidentiality, integrity, and availability are all rated as high, suggesting that exploitation can lead to complete system compromise.
Technical Analysis
The root cause of CVE-2021-44142 lies in improper handling of extended file attributes by the vfs_fruit module. The attacker can exploit this vulnerability over the network, requiring only low privileges and no user interaction. The complexity of the attack is low, which increases the risk as it allows even less-skilled attackers to exploit the flaw.
Exploitation could have severe consequences, including unauthorized access to sensitive data and the potential for full system control. The attacker could achieve high confidentiality, integrity, and availability impacts, making this a critical issue for organizations relying on Samba.
Risk & Impact Analysis
Risk to organizations includes unauthorized remote code execution, which can lead to significant operational disruptions. The potential for attackers to leverage this vulnerability to gain root access emphasizes the urgency for organizations to address this issue in their patch management cycles.
Given the vulnerability's high CVSS score and the availability of known exploits, organizations must consider this vulnerability a high priority. The urgency for remediation should be classified as high, necessitating immediate action to secure affected systems and minimize risk exposure.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following versions of Samba are affected by CVE-2021-44142: all versions prior to 4.13.17, 4.14.12, and 4.15.5. Additionally, several Linux distributions, including Debian and Ubuntu, are also impacted, specifically versions of Debian Linux 10.0 and 11.0, as well as Ubuntu Linux 14.04, 16.04, 18.04, 20.04, and 21.10.
Mitigation & Remediation
Organizations should prioritize patching immediately. The patched versions of Samba are 4.13.17, 4.14.12, and 4.15.5. If immediate patching is not feasible, consider implementing configuration hardening and network controls to limit access to the Samba service. Monitoring for unusual behavior or access patterns can also aid in mitigating the risk.
For detailed guidance on security testing, organizations may refer to penetration testing services that can help assess the security posture against this vulnerability.
Detection Guidance
To detect potential exploitation of CVE-2021-44142, organizations should monitor logs for abnormal access attempts or modifications to extended file attributes. Behavioral anomalies in Samba services, as well as network signatures indicative of exploitation attempts, should also be investigated.
AppSecure Threat Intelligence Insight
CVE-2021-44142 represents a significant risk to organizations utilizing Samba, particularly those in environments with extensive cross-platform interoperability requirements. The findings highlight the necessity for continuous monitoring and proactive vulnerability management strategies.
Organizations are encouraged to stay informed about emerging vulnerabilities and trends in the threat landscape. For further insights, consider reviewing best practices in penetration testing methodology and vulnerability management programs to bolster defenses against such vulnerabilities.
With the high CVSS score and the potential for exploitation, organizations must adopt a proactive stance towards vulnerability management and patching to reduce their risk exposure.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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