CVE-2019-13272 is a high-severity privilege escalation vulnerability affecting the Linux kernel before version 5.1.17. This vulnerability allows local users to obtain root access by exploiting certain scenarios involving a parent-child process relationship. Specifically, when a parent process drops its privileges and calls execve, an attacker can potentially gain control. The vulnerability arises from improper handling of process credentials within the ptrace_link function in kernel/ptrace.c.
The vulnerability has been assigned a CVSS score of 7.8, indicating a high level of severity. The risk to organizations includes potential unauthorized access to sensitive information and system controls. Given the exploitability of this vulnerability, organizations should prioritize patching immediately.
As of now, there is no confirmed public exploit available, but various proofs of concept have been identified in the exploit database. This indicates that although the exploit may not be widely known, it is conceivable that an attacker could develop a method to exploit this vulnerability if left unaddressed. Organizations should be vigilant and take appropriate measures to mitigate the risks associated with this vulnerability.
In addition to immediate patching, organizations should monitor their systems for any suspicious activity related to privilege escalation attempts. The potential impact on confidentiality, integrity, and availability underscores the importance of addressing this vulnerability promptly.
Vulnerability Details
The official description of this vulnerability states that the Linux kernel mishandles the recording of process credentials when a ptrace relationship is created. This flaw enables local users to leverage specific scenarios to gain root access. A contributing factor is an object lifetime issue, which can also result in system panic. Additionally, the incorrect marking of the ptrace relationship as privileged is exploitable via tools like Polkit's pkexec helper.
The CVSS score of 7.8 indicates a high severity level, with low attack complexity and low privileges required for exploitation. The vulnerability has significant confidentiality, integrity, and availability impacts, emphasizing the need for swift remediation.
Technical Analysis
The root cause of CVE-2019-13272 lies in the improper handling of process credentials within the Linux kernel's ptrace_link function. When a parent process drops its privileges and invokes execve, it may inadvertently grant root access to local users. This vulnerability is classified as a privilege escalation flaw, which allows an attacker to gain elevated privileges on the affected system.
The attack vector is local, meaning that an attacker must have access to the system to exploit this vulnerability. The attack complexity is low, as it does not require any user interaction. Successful exploitation may lead to complete control over the affected system, compromising its confidentiality, integrity, and availability.
Risk & Impact Analysis
The real-world risk associated with CVE-2019-13272 is substantial. Organizations deploying affected versions of the Linux kernel may face unauthorized access to sensitive data and resources, leading to significant operational and reputational damage. The potential for exploitation increases with the availability of proofs of concept and exploit code.
Given the high CVSS score of 7.8 and its classification as an actively exploited vulnerability in the KEV database, organizations must assess their exposure and prioritize remediation accordingly. The urgency for patching is critical, as any delay could result in significant ramifications.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
CVE-2019-13272 affects multiple versions of the Linux kernel, specifically versions prior to 5.1.17. This includes various distributions such as Debian, Fedora, and Ubuntu. Users should refer to their respective vendor advisories for specific version details.
Mitigation & Remediation
Organizations should apply patches as per vendor instructions to remediate CVE-2019-13272. The following actions are recommended:
1. Update to the latest Linux kernel version that includes the fix for this vulnerability.
2. Implement SELinux deny_ptrace as a temporary workaround in environments where patching is not immediately possible.
3. Regularly monitor systems for unauthorized privilege escalation attempts.
For more comprehensive security assessments, organizations can utilize penetration testing to validate the effectiveness of their remediation efforts.
Detection Guidance
Organizations should monitor logs for the following indicators of compromise related to CVE-2019-13272:
1. Unusual parent-child process relationships where a parent process drops privileges.
2. Logs indicating unauthorized access attempts or privilege escalations.
3. Monitoring for the execution of the execve system call in suspicious contexts.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2019-13272 is underscored by its classification in the KEV database, indicating an active threat landscape. Organizations must learn from this incident to enhance their security posture against similar vulnerabilities.
Patterns observed from this vulnerability highlight the need for robust privilege management and process isolation mechanisms. Security teams should focus on implementing defensive measures that reduce the attack surface for local privilege escalation vulnerabilities.
Strategically, organizations should adopt a proactive approach to vulnerability management, regularly conducting security assessments and patch management. For best practices in penetration testing, organizations can refer to the penetration testing methodology to ensure comprehensive coverage of their security efforts.
Awareness and training of development teams on secure coding practices can help prevent similar vulnerabilities in the future, ensuring that security is integrated into the software development lifecycle.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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