CVE-2022-2639 is a high-severity vulnerability impacting the Linux kernel's Open vSwitch module. An integer coercion error in the reserve_sfa_size() function can result in an out-of-bounds write access when a sufficiently large number of actions are processed. This flaw potentially allows a local user to crash their system or escalate their privileges, posing significant risks to system security.
With a CVSS score of 7.8, this vulnerability falls within the high severity range, indicating a serious risk to affected systems. Local exploitation is feasible due to the low privileges required for an attacker to execute an exploit. Organizations running vulnerable Linux kernel versions should prioritize addressing this vulnerability to avoid serious breaches.
The vulnerability was published on September 1, 2022, and has since been modified in the CVE database. Given its nature, organizations must act swiftly to apply patches or mitigations to prevent potential exploitation. Organizations should prioritize patching immediately.
Currently, there are known exploits for this vulnerability, as indicated by the existing proof-of-concept (PoC) code available on GitHub. This further highlights the urgency for organizations to remediate this flaw.
Vulnerability Details
The CVE description states: An integer coercion error was found in the openvswitch kernel module. Given a sufficiently large number of actions, while copying and reserving memory for a new action of a new flow, the reserve_sfa_size() function does not return -EMSGSIZE as expected, potentially leading to an out-of-bounds write access. This flaw allows a local user to crash or potentially escalate their privileges on the system.
This vulnerability is classified under CWE-192 (Integer Coercion Error) and CWE-681 (Incorrect Conversion between Numeric Types). The CVSS score of 7.8 indicates high severity, with significant impacts on confidentiality, integrity, and availability.
Affected versions include the Linux kernel from version 3.18.139 up to but not including 3.19, as well as several other versions listed in the vulnerability report. The vulnerability also affects Red Hat Enterprise Linux 8.0 and 9.0.
Technical Analysis
The root cause of CVE-2022-2639 lies in the integer coercion error within the Open vSwitch kernel module. The attack vector is local, meaning an attacker must have access to the system to exploit this vulnerability. The attack complexity is low, and only low privileges are required for the attacker to initiate an exploit.
User interaction is not necessary, making it easier for an attacker to exploit this vulnerability. The impact on confidentiality is high, as unauthorized access can lead to the disclosure of sensitive information. Similarly, the integrity and availability impacts are also rated high, indicating that the exploitation can severely disrupt system functionality.
Risk & Impact Analysis
The real-world deployment risk for organizations is substantial, particularly for those utilizing vulnerable versions of the Linux kernel. The potential blast radius is significant, as this vulnerability could allow an attacker to gain elevated privileges and potentially take control of the system.
Organizations should assess their exposure to this vulnerability and prioritize remediation efforts, especially given the presence of known exploits. The urgency for patching is high due to the potential for exploitation in the wild.
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following versions of the Linux kernel and Red Hat Enterprise Linux are affected by this vulnerability:
Linux Kernel versions: 3.18.139 to 3.19, 4.4.179 to 4.5, 4.9.169 to 4.9.312, 4.14.112 to 4.14.277, 4.19.35 to 4.19.240, 5.0.8 to 5.4.191, 5.5 to 5.10.113, 5.11 to 5.15.36, 5.16 to 5.17.5.
Additionally, Red Hat Enterprise Linux versions 8.0 and 9.0 are also vulnerable.
Mitigation & Remediation
Organizations should prioritize patching the affected Linux kernel versions as soon as possible. For those unable to immediately apply the patches, implementing workarounds and monitoring network activity can help mitigate potential risks. Regular updates and configuration hardening should also be part of the organization's security strategy.
For further guidance on effective testing and validation of security measures, organizations should consider engaging in penetration testing to ensure the effectiveness of their patching strategies.
Detection Guidance
Organizations should monitor logs for indicators of abnormal behavior, such as unauthorized privilege escalations or unexpected system crashes. Behavioral anomalies and changes in system performance should be investigated promptly to detect potential exploitation attempts.
AppSecure Threat Intelligence Insight
CVE-2022-2639 highlights the ongoing risk associated with local privilege escalation vulnerabilities. It underscores the importance of maintaining up-to-date systems and implementing robust security practices to mitigate such risks. The presence of public PoC code indicates that the vulnerability is actively being explored, further emphasizing the need for immediate action.
Security teams should remain vigilant and consider incorporating lessons learned from this incident into their defensive strategies. Ongoing training and awareness programs can help prepare teams for responding to similar vulnerabilities in the future.
For more insights on managing vulnerabilities and improving security posture, organizations can refer to our blog on vulnerability management programs and our detailed guide on penetration testing methodologies to enhance their security frameworks.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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