CVE-2024-33601 is a high-severity vulnerability affecting the Name Service Cache Daemon (nscd) in the GNU glibc library. This vulnerability allows for a denial of service due to a memory allocation failure when the netgroup cache is utilized. It was introduced in glibc version 2.15, which added the cache functionality to nscd. The flaw specifically occurs in the nscd binary and can lead to termination of the daemon, impacting service availability for clients.
Severity for this vulnerability is rated as high, with a CVSS score of 7.3. This rating indicates a significant risk to organizations that rely on the affected versions of glibc, particularly those running on Debian Linux and associated NetApp firmware. Organizations should address this vulnerability promptly to prevent potential service disruptions.
The vulnerability's exploitation status currently indicates no known public exploit or proof of concept, which provides a temporary relief but does not negate the need for immediate patching. Given the potential impact, organizations relying on affected systems should include this in their urgent patching cycle to maintain service integrity.
Urgency for defending against this vulnerability is high. Organizations should prioritize patching immediately to mitigate the associated risks and ensure continued service availability.
Vulnerability Details
The official description of CVE-2024-33601 states that the netgroup cache in nscd uses functions xmalloc or xrealloc, which can terminate the process due to memory allocation failures. This vulnerability allows attackers to cause a denial of service to clients relying on this service.
The CVSS v3.1 score for this vulnerability is 7.3, indicating a high severity level. The attack vector is classified as network, with low complexity, requiring no privileges or user interaction, leading to potential impacts on confidentiality, integrity, and availability.
Technical Analysis
The root cause of this vulnerability stems from how nscd manages memory allocation for its netgroup cache. When the daemon attempts to allocate memory using xmalloc or xrealloc, failure to do so can lead to a crash of the daemon, disrupting service availability.
This vulnerability can be exploited through a network attack vector, meaning an attacker does not need local access to exploit it. The attack complexity is low, as it does not require any special conditions to be met for successful exploitation. Furthermore, no privileges are required, and user interaction is not necessary, making this vulnerability even more critical.
Risk & Impact Analysis
The real-world risk associated with CVE-2024-33601 includes potential service interruptions for organizations using the affected versions of glibc. The impact of a denial of service may vary across environments but can lead to significant operational disruptions, especially for organizations reliant on the nscd service for client name service resolution.
Given the high CVSS score of 7.3, organizations should assess the urgency of addressing this vulnerability. With the potential for significant availability impacts, this vulnerability should be included in the organizations' priority patch cycle.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following versions are affected by CVE-2024-33601: glibc versions from 2.15 up to, but not including, 2.40. Additionally, various firmware versions from NetApp and Debian Linux 10.0 are also vulnerable.
Mitigation & Remediation
Organizations should prioritize patching affected systems to mitigate the risk associated with CVE-2024-33601. It is recommended to upgrade to glibc version 2.40 or later to resolve this vulnerability.
In addition to applying patches, organizations may consider implementing network controls to limit exposure to potentially malicious actors. Regular monitoring for unusual behavior in systems using nscd is also advisable.
For further guidance, organizations can refer to our penetration testing services to validate the effectiveness of patches and ensure secure configurations.
Detection Guidance
Organizations should monitor log files for any abnormal termination of the nscd daemon. Behavioral anomalies, such as unexpected service disruptions or degraded performance, may indicate attempts to exploit this vulnerability.
Network signatures can be created to detect unusual patterns of traffic directed at systems using nscd. Additionally, any changes to system configurations or unexpected restarts of the nscd service should be investigated promptly.
AppSecure Threat Intelligence Insight
CVE-2024-33601 highlights the importance of diligent memory management within critical system services such as nscd. The presence of this vulnerability serves as a reminder for organizations to regularly review and update their dependencies to mitigate potential risks.
The lack of known exploits at this time provides a temporary window of opportunity for organizations to address this issue before it can be leveraged by adversaries. Security teams should note this trend and implement proactive measures to enhance their defensive posture.
For further insights into vulnerability management strategies, organizations can explore our vulnerability management program design for best practices in maintaining secure environments.
Additionally, our penetration testing methodology can provide insights into identifying and remediating vulnerabilities effectively.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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