CVE-2014-9295 in NTP Daemon
Summary
by MITRE
Multiple stack-based buffer overflows in ntpd in NTP before 4.2.8 allow remote attackers to execute arbitrary code via a crafted packet, related to (1) the crypto_recv function when the Autokey Authentication feature is used, (2) the ctl_putdata function, and (3) the configure function.
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Analysis
by VulDB Data Team • 03/01/2022
The vulnerability identified as CVE-2014-9295 represents a critical stack-based buffer overflow in the Network Time Protocol daemon (ntpd) affecting versions prior to 4.2.8. This flaw resides within the core time synchronization service that millions of devices worldwide rely upon for accurate timekeeping, making it a prime target for exploitation. The vulnerability manifests in three distinct code paths within the ntpd implementation, each presenting unique attack vectors that could potentially lead to remote code execution. The affected functions include crypto_recv which handles Autokey Authentication, ctl_putdata responsible for control message processing, and configure which manages system configuration operations. These functions process incoming network packets without adequate bounds checking, creating opportunities for attackers to overflow stack buffers and overwrite critical program execution data.
The technical exploitation of this vulnerability leverages the fundamental nature of buffer overflows where maliciously crafted network packets can cause the program to write beyond allocated memory boundaries. When ntpd receives packets containing specially constructed data, the three vulnerable functions fail to validate input lengths against buffer sizes, allowing attackers to overwrite adjacent stack memory locations. This memory corruption can lead to arbitrary code execution with the privileges of the ntpd process, typically running with elevated system permissions. The Autokey Authentication feature presents a particularly dangerous attack surface since it involves cryptographic operations that may be triggered by legitimate network traffic, making exploitation more likely and harder to detect. The vulnerability's remote nature means attackers need only send malicious packets to affected systems, requiring no local access or authentication.
The operational impact of CVE-2014-9295 extends far beyond simple privilege escalation, as ntpd is a critical system service that many organizations depend upon for network time synchronization. When exploited successfully, this vulnerability allows attackers to gain complete control over affected systems, potentially enabling them to establish persistent backdoors, exfiltrate sensitive data, or use compromised systems as launch points for further attacks within a network. The widespread deployment of NTP across enterprise networks, internet infrastructure, and embedded systems amplifies the potential damage. Organizations with multiple time servers or those using Autokey Authentication are particularly at risk, as these configurations provide attackers with more reliable exploitation opportunities. The vulnerability also affects various operating systems including linux unix and windows platforms where NTP implementations are deployed, creating a broad attack surface.
Mitigation strategies for CVE-2014-9295 require immediate action to upgrade ntpd to version 4.2.8 or later, which includes patches addressing the specific buffer overflow conditions in the affected functions. Organizations should also implement network segmentation and access controls to limit exposure of time servers to untrusted networks, particularly disabling Autokey Authentication if not required for operations. The implementation of intrusion detection systems can help detect anomalous packet patterns that may indicate exploitation attempts. Additionally, network administrators should regularly audit their NTP configurations and disable unnecessary features such as the control interface and Autokey Authentication when not needed. According to CWE classification, this vulnerability maps to CWE-121 stack-based buffer overflow, while ATT&CK framework would categorize this under T1059 command and control through remote code execution techniques. Regular security monitoring and vulnerability assessments should be conducted to identify systems running outdated NTP versions, with particular attention to critical infrastructure components where time synchronization is essential for operations.