CVE-2003-1286 in Server
Summary
by MITRE
HTTP Proxy in Sambar Server before 6.0 beta 6, when security.ini lacks a 127.0.0.1 proxydeny entry, allows remote attackers to send proxy HTTP requests to the Sambar Server s administrative interface and external web servers, by making a "Connection: keep-alive" request before the proxy requests.
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Analysis
by VulDB Data Team • 04/12/2025
The vulnerability identified as CVE-2003-1286 represents a critical security flaw in the Sambar Server HTTP proxy implementation that existed prior to version 6.0 beta 6. This weakness stems from inadequate configuration controls within the security.ini file, specifically the absence of proper proxy denial entries for local addresses. The vulnerability allows remote attackers to exploit the proxy functionality by manipulating HTTP connection headers, creating a pathway for unauthorized access to both the server's administrative interface and external web resources. The flaw demonstrates a fundamental misconfiguration in access control mechanisms that should have prevented such proxy operations from being initiated by external parties.
The technical execution of this vulnerability relies on the manipulation of HTTP headers, specifically the "Connection: keep-alive" directive that is sent before actual proxy requests. This sequence enables attackers to establish persistent connections that can be leveraged to bypass normal security restrictions. When the security.ini configuration file fails to include a proxydeny entry for 127.0.0.1 addresses, the proxy server becomes vulnerable to unauthorized requests that could potentially expose internal network resources. The vulnerability operates at the application layer and demonstrates poor input validation and access control implementation, making it particularly dangerous for web servers that handle sensitive administrative functions.
The operational impact of CVE-2003-1286 extends beyond simple unauthorized access to encompass potential data breaches, service disruption, and escalation of privileges within the affected network environment. Attackers could leverage this vulnerability to gain access to administrative interfaces, potentially leading to full system compromise, or to conduct reconnaissance against external servers. The vulnerability also represents a significant risk to organizations relying on Sambar Server for web hosting services, as it could enable attackers to perform man-in-the-middle attacks or redirect traffic to malicious destinations. This flaw directly violates security principles related to network segmentation and access control, creating a pathway for lateral movement within compromised networks.
The vulnerability maps to CWE-284 Access Control Issues and aligns with ATT&CK techniques related to proxy usage and privilege escalation. Organizations should implement immediate mitigations including updating to Sambar Server version 6.0 beta 6 or later, configuring proper proxydeny entries in security.ini, and implementing network-level firewall rules to restrict access to administrative interfaces. Additionally, security monitoring should be enhanced to detect unusual proxy request patterns and unauthorized access attempts. The incident highlights the importance of proper configuration management and the critical need for regular security assessments to identify and remediate similar access control weaknesses in web server implementations.