CVE-2021-42374 is a medium-severity vulnerability affecting the unlzma applet of Busybox. This vulnerability allows an out-of-bounds heap read, which can lead to information leaks and denial of service when crafted LZMA-compressed input is decompressed. The risk to organizations includes potential data exposure and service disruptions, making it imperative for defenders to act swiftly.
The vulnerability has a CVSS score of 5.3, indicating a medium level of severity. Organizations should prioritize patching immediately to mitigate the risks associated with this vulnerability. As it is a local attack vector with high attack complexity, it requires low privileges and does not necessitate user interaction.
Currently, there are no known exploits in the wild for this vulnerability, but the potential impact on confidentiality, integrity, and availability underscores the need for vigilance in monitoring systems for any signs of compromise.
Organizations should assess their environments for affected software versions and apply the necessary patches. The urgency of this situation cannot be overstated, as the implications of unaddressed vulnerabilities can lead to significant operational and reputational damage.
Vulnerability Details
The CVE-2021-42374 vulnerability was published on November 15, 2021. This vulnerability is classified under CWE-125 for out-of-bounds read. Busybox versions from 1.27.0 to 1.33.1 are affected, and it can also impact various products from Fedora and NetApp that incorporate Busybox functionalities.
Technical Analysis
The root cause of CVE-2021-42374 is an out-of-bounds read in the unlzma applet. This issue arises when the application attempts to read beyond the allocated memory buffer due to improper handling of compressed input. The attack vector is local, requiring an attacker to have local access to the affected system.
The attack complexity is considered high, as it requires a crafted input that can exploit the flaw. The required privileges are low, meaning that an attacker with basic user-level access can potentially trigger the vulnerability. Importantly, no user interaction is needed, making it easier for an attacker to execute.
When exploited, this vulnerability can lead to low confidentiality impact, as sensitive information could be leaked, and high availability impact due to potential denial of service.
Risk & Impact Analysis
The risk to organizations includes a significant threat of information leakage, which can lead to unauthorized access to sensitive data. Additionally, denial of service could disrupt operations, impacting business continuity. Given the medium severity score, organizations must assess their exposure to this vulnerability and address it with appropriate urgency.
The potential blast radius could affect all systems running vulnerable versions of Busybox, Fedora, and NetApp components, highlighting the importance of rapid remediation. Organizations should prioritize this vulnerability during their patch cycles, as timely updates can mitigate potential exploitation risks.
With an EPSS score in the lower percentile, the immediate threat may appear low, but the nature of the vulnerability necessitates proactive measures to prevent any future exploitation as threat landscapes evolve.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerability affects Busybox versions from 1.27.0 to 1.33.1, as well as various Fedora versions (33 and 34) and multiple NetApp products, including cloud_backup, hci_management_node, and solidfire. If specific versions are not known, it is safe to assume that all versions prior to the vendor patch are affected.
Mitigation & Remediation
Organizations should apply patches for Busybox, Fedora, and NetApp products immediately. If a patch is unavailable, workarounds might include limiting access to the affected applet and monitoring for unusual activities. Configuration hardening and network controls can further mitigate potential exploitation.
For those unsure of the current vulnerability landscape, conducting a thorough security assessment can help identify at-risk components. Organizations should validate their remediation processes through application security assessment to ensure all potential vulnerabilities are accounted for.
Detection Guidance
Monitoring logs for access to the unlzma applet and tracking behavioral anomalies can help detect attempts to exploit this vulnerability. Additionally, organizations should look for network signatures that may indicate attempts to send malicious LZMA-compressed files.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-42374 lies in its representation of the risks associated with improperly managed memory in software applications. As organizations increasingly rely on third-party components, understanding vulnerabilities such as this becomes critical.
Security teams should be aware of the trends in vulnerabilities related to memory management and take proactive steps to address them. For further insights, organizations can explore our vulnerability management program and the importance of regular security assessments.
Organizations should also remember the necessity of conducting penetration testing to validate the effectiveness of their defenses against such vulnerabilities.
Finally, organizations should consider the implications of this vulnerability within the context of their overall security strategy, ensuring that they are prepared for any future threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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