CVE-2005-1814 in PicoWebServer
Summary
by MITRE
Stack-based buffer overflow in PicoWebServer 1.0 allows remote attackers to cause a denial of service (application crash) and possibly execute arbitrary code via a long URL.
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Analysis
by VulDB Data Team • 07/09/2018
The vulnerability identified as CVE-2005-1814 represents a critical stack-based buffer overflow flaw within PicoWebServer version 1.0, a lightweight web server implementation that was widely deployed in embedded systems and small-scale network appliances. This vulnerability resides in the server's handling of Uniform Resource Locator (URL) requests, where the application fails to properly validate the length of incoming URL data before processing it through stack-based memory operations. The flaw manifests when a remote attacker crafts a maliciously long URL that exceeds the allocated buffer space, causing the program to overwrite adjacent memory locations on the stack. Such buffer overflow conditions are particularly dangerous because they can lead to unpredictable application behavior, including crashes, data corruption, or in more severe cases, arbitrary code execution. The vulnerability affects the core functionality of the web server by exploiting the fundamental memory management practices that were inadequate in the implementation.
The technical nature of this vulnerability aligns with CWE-121 Stack-based Buffer Overflow, which specifically addresses buffer overflows occurring in stack memory regions where the buffer size is insufficient to handle the incoming data. The flaw demonstrates a classic lack of input validation and bounds checking in the URL parsing mechanism of PicoWebServer, where the application does not enforce maximum length constraints on URL components. This type of vulnerability falls under the ATT&CK technique T1203 Exploitation for Client Execution, as it enables remote code execution capabilities when properly exploited. The stack-based nature of the overflow means that the attacker can potentially overwrite return addresses, function pointers, or other critical stack variables that control program execution flow. The vulnerability is particularly concerning for embedded systems and network appliances that rely on PicoWebServer, as these devices often lack robust memory protection mechanisms and are typically not regularly updated.
The operational impact of CVE-2005-1814 extends beyond simple denial of service conditions, as the vulnerability can be leveraged for more sophisticated attacks. When exploited successfully, the buffer overflow can cause the web server process to crash and restart repeatedly, leading to persistent denial of service conditions that can disrupt legitimate user access. More critically, if an attacker can carefully craft the overflow to overwrite specific memory locations, they may be able to inject and execute arbitrary code within the context of the web server process. This could potentially allow attackers to gain unauthorized access to the underlying system, escalate privileges, or establish persistent backdoors. The vulnerability is particularly dangerous in environments where PicoWebServer runs with elevated privileges or where the server serves as a gateway to other network resources. The impact is amplified in industrial control systems, IoT devices, and network infrastructure appliances that may not have regular security updates or patch management processes in place, making these systems prime targets for exploitation.
Mitigation strategies for CVE-2005-1814 require both immediate and long-term approaches to address the fundamental design flaw in PicoWebServer 1.0. The most effective immediate solution involves applying the vendor-provided patch or upgrading to a newer version of the web server software that implements proper input validation and bounds checking for URL handling. Organizations should also implement network-level protections such as web application firewalls and URL filtering mechanisms that can detect and block excessively long URL requests before they reach the vulnerable server. Additional mitigations include configuring the web server to enforce strict URL length limits, implementing memory protection mechanisms like stack canaries, and conducting regular security assessments of embedded systems that utilize PicoWebServer. From a defensive perspective, network administrators should monitor for suspicious traffic patterns that may indicate exploitation attempts and implement intrusion detection systems capable of identifying malformed URL requests. The vulnerability also highlights the importance of secure coding practices and input validation in all software implementations, particularly in embedded systems where resource constraints should not compromise security measures. Organizations should establish robust patch management processes to ensure that legacy systems are regularly updated with security fixes, as many embedded devices using PicoWebServer may not receive updates beyond their initial deployment.