CVE-2003-1502 in mod_throttle
Summary
by MITRE
mod_throttle 3.0 allows local users with Apache privileges to access shared memory that points to a file that is writable by the apache user, which could allow local users to gain privileges.
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Analysis
by VulDB Data Team • 06/17/2018
The vulnerability described in CVE-2003-1502 affects mod_throttle version 3.0, a module for the Apache HTTP Server that implements bandwidth throttling functionality. This flaw represents a critical privilege escalation vulnerability that exploits improper memory management within the module's operation. The issue arises from the module's handling of shared memory segments that are accessible to processes running with Apache privileges, creating an exploitable condition that can be leveraged by local attackers with access to the Apache user account.
The technical implementation of this vulnerability stems from the module's failure to properly validate or restrict access to shared memory regions that contain file references. When mod_throttle 3.0 initializes or manages its memory structures, it creates shared memory segments that point to files which are writable by the apache user account. This design flaw allows local users who already possess Apache privileges to manipulate these shared memory regions, potentially redirecting memory pointers to malicious data or exploiting the writable file references to achieve unauthorized access. The vulnerability specifically targets the memory management mechanisms within the Apache module architecture, creating an attack surface that bypasses normal privilege boundaries.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it enables local attackers to potentially gain elevated system privileges and execute arbitrary code with the privileges of the Apache user. This represents a significant security risk in web server environments where the Apache process runs with elevated permissions, as attackers can leverage this flaw to move laterally within the system or establish persistent access. The vulnerability is particularly concerning because it requires only local access to the Apache user account, which is often more easily obtained than gaining direct system administrator privileges, making it a preferred attack vector for privilege escalation attacks.
From a cybersecurity perspective, this vulnerability maps to CWE-276, which covers improper privileges, and aligns with ATT&CK technique T1068, which involves exploit for privilege escalation. The flaw demonstrates poor secure coding practices in memory management and access control implementation. Organizations should implement immediate mitigations including updating to patched versions of mod_throttle, restricting Apache user privileges where possible, and monitoring for unauthorized access attempts. The vulnerability also highlights the importance of proper memory management in server modules and the necessity of validating all shared memory access patterns. System administrators should consider implementing additional security controls such as mandatory access controls, file integrity monitoring, and regular security assessments to prevent exploitation of similar memory-related vulnerabilities in other Apache modules or web server components.