A use-after-free vulnerability was discovered in the xasprintf function in xfuncs_printf.c:344 of BusyBox v1.36.1. This vulnerability allows attackers to exploit the application through local access, posing a medium severity risk with a CVSS score of 5.5. The vulnerability's impact is primarily on availability, which can lead to system instability and potential service disruptions.
Organizations utilizing BusyBox v1.36.1 are at risk, as the exploitation of this vulnerability may cause significant disruptions in service. Given that the attack complexity is low and no privileges are required to exploit this vulnerability, it is crucial for organizations to assess their exposure and take necessary actions to mitigate the risk.
The urgency of remediation is underscored by the fact that user interaction is required to trigger the vulnerability, which could be exploited through malicious input. As such, it is essential for organizations to prioritize patching of this vulnerability to ensure continued availability of their services.
Currently, there are no known public exploits or proof-of-concept code available for CVE-2023-42363, but organizations should not become complacent. The absence of known exploitation does not imply an absence of risk, and proactive measures should be taken.
Vulnerability Details
CVE-2023-42363 is characterized as a use-after-free vulnerability in the xasprintf function, which can lead to a high impact on availability. The CVSS score of 5.5 categorizes this vulnerability as medium severity. The affected component is BusyBox, specifically version 1.36.1.
The vulnerability was published on November 27, 2023, and is classified under CWE-416. Organizations using this version of BusyBox should take immediate action to update to a patched version to mitigate the risk.
Technical Analysis
The root cause of CVE-2023-42363 stems from improper memory management in the xasprintf function, leading to a use-after-free condition. This vulnerability requires local access to exploit, which means attackers must have some form of access to the system running BusyBox.
The attack complexity is rated as low, indicating that the conditions to exploit this vulnerability are straightforward. No privileges are required, and user interaction is necessary, making it potentially exploitable through crafted input.
The impacts of this vulnerability include potential availability issues, as it could crash the application or lead to resource exhaustion, affecting service continuity.
Risk & Impact Analysis
Risk to organizations includes significant disruptions to service availability, which could lead to financial losses and damage to reputation. Given the increasing reliance on BusyBox in embedded and resource-constrained environments, the blast radius for this vulnerability could be extensive, affecting numerous systems and applications.
Organizations should assess their exposure to BusyBox v1.36.1 and prioritize patching as part of their security hygiene. The medium severity rating indicates that while there is no immediate critical threat, timely remediation is necessary to prevent potential exploitation.
The CVSS score of 5.5 reflects a moderate risk, but the potential for availability issues necessitates a proactive approach to vulnerability management.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The only affected version currently known is BusyBox v1.36.1. Organizations using this version should take immediate action to upgrade or patch their systems to address this vulnerability.
Mitigation & Remediation
To mitigate the impact of CVE-2023-42363, organizations should apply the latest patches provided by BusyBox. It's essential to monitor the vendor's site for updates and ensure all systems are running the most secure version.
In the absence of patches, organizations should consider implementing configuration hardening, such as restricting access to the BusyBox utilities and employing network controls to limit exposure.
Monitoring for unusual behaviors in applications using BusyBox can also help in early detection of potential exploitation attempts.
Continuous security testing may also be a valuable strategy to ensure vulnerabilities are identified and remediated promptly.
Detection Guidance
Organizations should establish log indicators to track access to the BusyBox utilities and monitor for any unexpected system crashes or performance issues.
Behavioral anomalies such as unexpected application terminations or memory access violations should be investigated immediately.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2023-42363 highlights the importance of robust memory management practices in software development. Security teams should ensure thorough testing for use-after-free vulnerabilities to prevent similar issues in the future.
This vulnerability represents a trend where local exploits can have significant impacts on availability, emphasizing the need for continuous monitoring and patch management.
Lessons learned from this vulnerability include the necessity of integrating security into the development lifecycle. Security teams should prioritize training developers in secure coding practices to minimize vulnerabilities.
Penetration testing methodology should be revisited to ensure that all aspects of memory management are thoroughly tested.
Establishing a vulnerability management program will also help organizations to proactively identify and mitigate risks associated with software vulnerabilities.
API penetration testing should also be considered to cover all potential attack vectors.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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