CVE-2008-7191 in Polipo
Summary
by MITRE
Unspecified vulnerability in Polipo before 1.0.4 allows remote attackers to cause a denial of service (crash) via a long request URL.
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Analysis
by VulDB Data Team • 01/19/2019
The vulnerability identified as CVE-2008-7191 represents a denial of service weakness within the Polipo web proxy software version 1.0.3 and earlier. This issue stems from inadequate input validation mechanisms that fail to properly handle excessively long request URLs. The vulnerability manifests when remote attackers submit malformed HTTP requests containing extraordinarily long URLs that exceed the software's expected parameter limits, causing the proxy to crash and become unavailable to legitimate users. Such a flaw directly impacts the availability aspect of the system's security triad by creating a condition where the service can be rendered inoperable through relatively simple means.
The technical nature of this vulnerability aligns with CWE-122, which describes buffer overflow conditions, and CWE-400, which covers unspecified resource management issues. The flaw occurs at the protocol parsing layer where the software does not implement proper bounds checking on incoming URL parameters. When a URL exceeds the allocated buffer space or memory allocation limits, the application encounters an unhandled exception that results in a complete service crash. This behavior demonstrates poor error handling and input sanitization practices that are fundamental to secure software development. The vulnerability operates at the application layer of the network stack and can be exploited through standard network protocols without requiring special privileges or authentication.
From an operational standpoint, this vulnerability presents significant risk to organizations relying on Polipo as a web proxy service. The remote exploitation capability means that attackers can trigger the denial of service condition from any location on the internet, making it particularly dangerous for public-facing proxy services. The impact extends beyond simple service disruption as it can affect legitimate users who depend on the proxy for internet access, potentially causing business interruptions and productivity losses. Organizations may experience cascading effects where the proxy failure impacts downstream applications and services that depend on its functionality, creating broader operational consequences that extend well beyond the immediate system failure.
Mitigation strategies for this vulnerability include immediate deployment of the patched version 1.0.4 or later, which implements proper input validation and bounds checking mechanisms. Network administrators should also consider implementing rate limiting and connection throttling measures to prevent abuse of the vulnerable service. Additional protective measures include configuring intrusion detection systems to monitor for suspicious URL patterns and implementing proper logging and monitoring to detect exploitation attempts. The vulnerability highlights the importance of regular security updates and the need for comprehensive input validation across all network services. Organizations should also consider implementing redundant proxy services or load balancing configurations to minimize the impact of single points of failure. Compliance with security standards such as those outlined in the NIST Cybersecurity Framework and ISO/IEC 27001 emphasizes the necessity of maintaining up-to-date software and implementing proper vulnerability management processes to prevent such incidents.