CVE-2008-5106 in Sami FTP Server
Summary
by MITRE
Buffer overflow in KarjaSoft Sami FTP Server 2.0.x allows remote attackers to cause a denial of service (daemon crash) and possibly execute arbitrary code via a long argument to an arbitrary command, which triggers the overflow when the SamyFtp.binlog log file is viewed in the management console. NOTE: this may overlap CVE-2006-0441 and CVE-2006-2212.
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Analysis
by VulDB Data Team • 03/27/2019
The vulnerability identified as CVE-2008-5106 represents a critical buffer overflow flaw within the KarjaSoft Sami FTP Server version 2.0.x series. This security weakness manifests when remote attackers submit excessively long arguments to any arbitrary command within the FTP server interface. The flaw specifically targets the server's logging mechanism, where the overflow occurs during the viewing of the SamyFtp.binlog file through the management console interface. The vulnerability demonstrates characteristics consistent with CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The impact extends beyond simple denial of service to potentially enabling remote code execution, making this a particularly dangerous vulnerability in networked environments.
The technical exploitation of this buffer overflow occurs through a carefully crafted input sequence that exceeds the allocated buffer size within the server's command processing routines. When an attacker sends a malformed command with an oversized argument, the server's memory management fails to properly validate the input length, leading to memory corruption. The specific trigger point involves the management console's handling of the log file viewing functionality, where the server attempts to parse and display the malicious input without adequate input sanitization. This vulnerability demonstrates the classic characteristics of a stack-based buffer overflow as defined by CWE-121, where the overflow corrupts the stack frame and potentially allows attackers to overwrite return addresses and function pointers. The exploitation process aligns with ATT&CK technique T1203, which involves the use of malicious input to cause system instability and potential code execution.
The operational impact of this vulnerability creates significant risks for organizations utilizing the affected FTP server software. Beyond the immediate denial of service condition that crashes the daemon process, the potential for arbitrary code execution presents a severe threat to system integrity and data security. Attackers could leverage this vulnerability to gain unauthorized access to the server, potentially escalating privileges and establishing persistent access points within the network infrastructure. The vulnerability's exploitation requires minimal privileges and can be executed remotely, making it particularly attractive to threat actors seeking to compromise network services. Organizations running this version of the Sami FTP Server face potential data breaches, service disruption, and unauthorized system access, with the severity amplified by the vulnerability's ability to trigger system crashes and code execution simultaneously.
Mitigation strategies for CVE-2008-5106 should prioritize immediate software updates to the latest available version of the KarjaSoft Sami FTP Server that addresses this buffer overflow vulnerability. System administrators should implement network segmentation to limit access to FTP services and restrict management console access to trusted administrative networks only. Input validation should be enhanced through the implementation of strict command argument length limits and comprehensive sanitization routines before any processing occurs. The management console should be configured to disable or restrict log file viewing capabilities when possible, as this represents the primary trigger point for the vulnerability. Additionally, organizations should deploy intrusion detection systems capable of identifying malformed FTP command sequences and implement regular security audits to verify that no unauthorized modifications have occurred to the FTP server configuration. Network monitoring should be enhanced to detect unusual patterns of FTP traffic that may indicate exploitation attempts, and all affected systems should undergo comprehensive vulnerability assessments to identify potential secondary impacts from any successful exploitation attempts.