In the Linux kernel, a vulnerability has been identified and resolved, classified as CVE-2022-50497. This vulnerability allows for a shift-out-of-bounds condition in the binfmt_misc functionality, specifically in check_special_flags. As reported by UBSAN (Undefined Behavior Sanitizer), a left shift of 1 by 31 places cannot be represented in the type 'int'. The call trace indicates a potential route of exploitation through various kernel functions, emphasizing the need for immediate action.
The CVSS score for this vulnerability is 7.1, categorizing it as high severity. This score is indicative of the potential impact on confidentiality and availability, with a high confidentiality impact and a high availability impact. The attack vector is local, and it requires low privileges with no user interaction necessary, making it easier for an attacker to exploit this vulnerability.
Risk to organizations includes unauthorized access to sensitive information and potential disruption of services due to the availability impact. Given the ease of exploitation, organizations should prioritize patching immediately.
The urgency for defenders cannot be overstated, as the implications of this vulnerability could lead to significant operational and security challenges.
There is no known public exploit for CVE-2022-50497, and it has not been included in the Known Exploited Vulnerabilities (KEV) catalog, but vigilance is essential. Organizations are advised to stay updated with the latest patches and security advisories.
Vulnerability Details
The vulnerability has been described as follows: In the Linux kernel, the following vulnerability has been resolved: binfmt_misc: fix shift-out-of-bounds in check_special_flags. The UBSAN reported a shift-out-of-bounds warning: left shift of 1 by 31 places cannot be represented in type 'int'. The call trace outlines the functions involved that lead to the vulnerability, indicating the critical areas of concern.
CVE-2022-50497 has a CVSS score of 7.1, indicating a high severity level. The attack vector is local, and the attack complexity is low, requiring low privileges and no user interaction. The confidentiality and availability impacts are both high, while the integrity impact remains none. This vulnerability is classified under CWE-125.
Technical Analysis
The root cause of the vulnerability lies in the handling of flags within the Linux kernel, specifically in the binfmt_misc functionality. The incorrect definition of macros for Node's flags results in the potential for a shift-out-of-bounds condition, which can lead to serious security implications.
The attack vector is local, meaning an attacker must have access to the system to exploit this vulnerability. The attack complexity is low, making it easier for attackers with low privileges to execute an attack without requiring user interaction. Given the high confidentiality and availability impacts, the urgency for organizations to address this vulnerability is clear.
Risk & Impact Analysis
The risk to organizations includes potential unauthorized access to sensitive data, which could be exploited by malicious actors. The availability impact suggests that systems may experience disruptions, affecting business operations. The blast radius is significant, as this vulnerability affects multiple versions of the Linux kernel, potentially impacting a wide range of systems and applications.
Given the CVSS score of 7.1, organizations should address this vulnerability in their priority patch cycle. The urgency of this vulnerability highlights the critical need for organizations to maintain robust patch management practices to mitigate such risks.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions of the Linux kernel prior to the patch are affected by this vulnerability. Specifically, it impacts versions starting from 2.6.12.1 to less than 4.9.337, and various other version ranges up to 6.1.2. Organizations should ensure that their systems are updated to the latest versions to mitigate this risk.
Mitigation & Remediation
Organizations should prioritize patching their Linux kernel to incorporate the latest updates that resolve this vulnerability. The specific patches are available through the official Linux kernel repositories. If immediate patching is not feasible, organizations should implement temporary workarounds such as restricting access to vulnerable functions or applying configuration hardening techniques. Continuous monitoring of systems for anomalies related to this vulnerability is also recommended.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor logs for unusual write operations or attempts to access the binfmt_misc functionality. Behavioral anomalies, such as unexpected system crashes or performance degradation, may also indicate exploitation attempts. Network signatures related to unauthorized access should be logged and investigated promptly.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2022-50497 lies in the ongoing vulnerabilities associated with the Linux kernel, often targeted in local privilege escalation scenarios. The pattern of vulnerabilities in this area highlights the necessity for organizations to adopt comprehensive patch management and vulnerability management programs.
Security teams should continuously evaluate their defenses against local attacks, employing strategies such as penetration testing to identify and remediate similar weaknesses in their systems.
The implications of this vulnerability reinforce the need for organizations to remain vigilant and proactive in their cybersecurity posture, particularly regarding kernel-level vulnerabilities.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
.webp)