CVE-2002-1781 in Delegate
Summary
by MITRE
Multiple buffer overflows in DeleGate 7.7.0 through 7.8.1 allow remote attackers to execute arbitrary code, as demonstrated using a long USER command to the POP proxy.
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Analysis
by VulDB Data Team • 05/26/2019
The vulnerability identified as CVE-2002-1781 represents a critical security flaw affecting DeleGate versions 7.7.0 through 7.8.1, specifically within the POP proxy functionality. This issue manifests as multiple buffer overflows that can be exploited by remote attackers to achieve arbitrary code execution on affected systems. The vulnerability was particularly demonstrated through the exploitation of a long USER command, highlighting the dangerous nature of improper input validation in network proxy services. The affected DeleGate versions operate as a versatile proxy server that handles various protocols including POP, IMAP, HTTP, and others, making this vulnerability particularly concerning for organizations relying on these services for email and web access.
The technical implementation of this vulnerability stems from inadequate bounds checking within the POP proxy component of DeleGate. When processing the USER command, the application fails to properly validate the length of user input, allowing attackers to supply excessively long strings that exceed the allocated buffer space. This classic buffer overflow condition occurs when the application writes data beyond the boundaries of the intended memory allocation, potentially overwriting adjacent memory locations including return addresses and control data. The flaw directly corresponds to CWE-121, which categorizes buffer overflow conditions where insufficient space is allocated for data, and CWE-122, which addresses heap-based buffer overflows. The vulnerability's exploitation mechanism aligns with ATT&CK technique T1203, which involves the exploitation of input validation flaws to execute arbitrary code through memory corruption attacks.
The operational impact of CVE-2002-1781 extends beyond simple code execution, as successful exploitation can lead to complete system compromise and unauthorized access to email data. Organizations utilizing DeleGate for POP proxy services face significant risk of unauthorized email access, data exfiltration, and potential lateral movement within their network infrastructure. The remote nature of the attack means that adversaries do not require physical access or local network presence to exploit the vulnerability, making it particularly dangerous for email servers and corporate networks. The vulnerability affects the core functionality of DeleGate's proxy services, potentially disrupting legitimate email operations while providing attackers with persistent access to email accounts and associated data. This type of vulnerability represents a serious threat to email security and can result in substantial data breaches and compliance violations.
Mitigation strategies for CVE-2002-1781 focus primarily on immediate remediation through software updates and patches provided by the DeleGate developers. Organizations should prioritize upgrading to DeleGate versions that have addressed this vulnerability, as the affected versions represent a significant security risk. Network administrators should implement additional defensive measures including input validation controls, network segmentation, and monitoring for suspicious POP proxy activity. The vulnerability demonstrates the importance of proper input sanitization and bounds checking in network services, reinforcing industry best practices for secure coding. Security teams should also consider implementing intrusion detection systems to monitor for exploitation attempts and establish incident response procedures for potential compromise scenarios. Regular security assessments and vulnerability scanning should be conducted to identify and remediate similar issues in other network services and applications.