CVE-2002-1066 in Jana Web Server
Summary
by MITRE
Thomas Hauck Jana Server 1.4.6 and earlier allows remote attackers to cause a denial of service and possibly execute arbitrary code via a large message index value in a (1) RETR or (2) DELE command to the POP3 server, which exceeds the array limits and allows a buffer overflow attack.
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Analysis
by VulDB Data Team • 09/09/2025
The vulnerability identified as CVE-2002-1066 affects Thomas Hauck Jana Server version 1.4.6 and earlier implementations, presenting a critical security risk within POP3 server communications. This flaw resides in the server's handling of message index values within specific command sequences, creating a pathway for remote attackers to exploit the system through carefully crafted malicious inputs. The vulnerability specifically targets the RETR and DELE commands within the POP3 protocol, which are fundamental operations for retrieving and deleting messages from a mail server. The security implications extend beyond simple denial of service, as the flaw potentially enables arbitrary code execution, making it particularly dangerous for email infrastructure systems.
The technical mechanism behind this vulnerability involves improper input validation and buffer management within the server's POP3 implementation. When attackers submit a large message index value through either the RETR or DELE commands, the server fails to properly validate the input against array bounds and memory limits. This lack of proper boundary checking causes the server to attempt to access memory locations beyond the allocated buffer space, resulting in a classic buffer overflow condition. The buffer overflow occurs because the server's internal data structures cannot accommodate the oversized index values, leading to memory corruption that can be exploited to execute malicious code or cause system instability. This type of vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflow scenarios. The flaw demonstrates poor input sanitization practices that violate fundamental security principles for handling user-supplied data in server applications.
The operational impact of CVE-2002-1066 extends significantly beyond immediate service disruption, as it creates potential entry points for attackers to compromise entire email infrastructure systems. Remote attackers can leverage this vulnerability to cause persistent denial of service conditions that may require system restarts or manual intervention to resolve, disrupting legitimate email communications for users. More critically, the possibility of arbitrary code execution means that attackers could potentially gain unauthorized access to the server, install backdoors, or escalate privileges to gain full system control. This vulnerability affects the core functionality of email services, making it particularly attractive to threat actors seeking to compromise email servers for data exfiltration, spam distribution, or as a stepping stone for broader network attacks. The impact is amplified in environments where email servers handle sensitive communications, as successful exploitation could lead to data breaches and unauthorized access to confidential information. The vulnerability's classification under the ATT&CK framework would align with techniques such as T1203 (Exploitation for Client Execution) and T1499 (Endpoint Denial of Service), demonstrating how this flaw can be leveraged for both immediate service disruption and long-term system compromise.
Mitigation strategies for CVE-2002-1066 require immediate action to address the underlying buffer overflow vulnerability through proper input validation and code security improvements. Organizations should prioritize upgrading to versions of Thomas Hauck Jana Server that have addressed this vulnerability, as the vendor has likely implemented proper bounds checking and input validation mechanisms. System administrators should implement network-level restrictions to limit access to POP3 services where possible, reducing the attack surface for remote exploitation attempts. Additionally, implementing robust logging and monitoring for POP3 command sequences can help detect anomalous behavior that may indicate exploitation attempts. The fix should include comprehensive input validation that checks all message index values against predetermined maximum limits, ensuring that array access operations remain within safe memory boundaries. Security teams should also consider implementing intrusion detection systems that can identify and alert on suspicious POP3 command patterns, particularly those involving unusually large index values. Regular security assessments and code reviews focusing on buffer management and input validation practices will help prevent similar vulnerabilities from emerging in other components of the email infrastructure.