The vulnerability identified as CVE-2022-23471 is a medium severity issue affecting the Linux Foundation's container runtime, containerd. This vulnerability allows a user to exhaust memory on the host due to a bug in the containerd's CRI implementation.
The core of the issue lies within the CRI stream server, where a goroutine is launched to handle terminal resize events when a TTY is requested. If a user's process fails to launch, for instance, due to a faulty command, the goroutine can become stuck waiting to send data without a receiver. This results in a memory leak, which can lead to denial of service by exhausting host memory.
Given the potential impact, including high availability risks, organizations utilizing containerd must prioritize updating to the fixed versions: containerd 1.6.12 or 1.5.16. For those unable to upgrade immediately, it is crucial to ensure that only trusted images and commands are executed and that permissions are tightly controlled.
This vulnerability is classified under CWE-400 (Uncontrolled Resource Consumption) and CWE-401 (Resource Exhaustion), highlighting the critical need for secure resource management in container environments.
Vulnerability Details
The vulnerability is officially described as follows: CVE-2022-23471 allows for memory exhaustion on the host due to a bug in containerd's CRI implementation. The issue arises when a user's process fails to launch, leaving the goroutine waiting without a receiver, which leads to a memory leak.
The CVSS score for this vulnerability is 5.7, which is categorized as medium severity. The vulnerability impacts availability, with a high impact score due to the potential for denial of service.
The affected product is containerd, with versions prior to 1.5.16 and between 1.6.0 and 1.6.12 being vulnerable. Users are strongly encouraged to update to the latest versions to mitigate this risk.
Technical Analysis
The root cause of CVE-2022-23471 lies in the handling of terminal resize events within containerd's CRI implementation. When a terminal is requested, a goroutine is spawned to manage the resize events. If a user's process fails to launch due to errors, this goroutine can become stuck, leading to a memory leak.
The attack vector is network-based (AV:N), indicating that this vulnerability can be exploited over the network. The attack complexity is considered low (AC:L), suggesting that an attacker can exploit this vulnerability with minimal effort.
Privileges required for exploitation are also low (PR:L), meaning that an attacker does not need elevated privileges to exploit this vulnerability. User interaction is required (UI:R), as the attacker must interact with the system in a specific way to trigger the vulnerability.
The impact on confidentiality and integrity is none (C:N, I:N), but the availability impact is high (A:H), emphasizing the potential for service disruption.
Risk & Impact Analysis
The real-world risk associated with CVE-2022-23471 is significant. Organizations that utilize containerd are exposed to potential denial of service if this vulnerability is exploited. This could lead to service disruptions, impacting business operations and customer trust.
With a CVSS score of 5.7, the urgency for organizations to address this vulnerability is medium. Organizations should schedule remediation as part of their security patching process. The blast radius could be substantial, especially for organizations that rely heavily on containerized environments.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerable versions of containerd include all versions prior to 1.5.16 and those from 1.6.0 up to, but not including, 1.6.12. Users should upgrade to these patched versions to mitigate the risk.
Mitigation & Remediation
To mitigate the risks associated with CVE-2022-23471, organizations should update to containerd versions 1.6.12 or 1.5.16. For users unable to perform immediate upgrades, it is critical to ensure that only trusted images and commands are utilized in container environments.
Additional recommendations include restricting command execution to trusted users and implementing monitoring to detect any unusual memory usage patterns. Organizations may also consider performing penetration testing to evaluate the security posture of their containerized applications.
Detection Guidance
Organizations should monitor their containerized environments for signs of memory exhaustion or unusual behavior patterns. Key indicators include unexpected spikes in memory usage and the presence of untrusted commands or images in containers.
AppSecure Threat Intelligence Insight
CVE-2022-23471 highlights the importance of robust resource management in containerized applications. As organizations increasingly adopt container technology, vulnerabilities like this can lead to significant downtime and operational disruption.
Security teams should implement best practices for container security, including regular updates and vulnerability assessments. For more insights, organizations can refer to the following resources: penetration testing methodology, vulnerability management program design, and cloud penetration testing guide for comprehensive security strategies.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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