CVE-2012-1783 in Tiny Server
Summary
by MITRE
Tiny Server 1.1.9 and earlier allows remote attackers to cause a denial of service (crash) via a long string in a GET request without an HTTP version number.
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Analysis
by VulDB Data Team • 08/03/2025
The vulnerability identified as CVE-2012-1783 affects Tiny Server version 1.1.9 and earlier, representing a critical denial of service flaw that can be exploited by remote attackers to crash the affected system. This vulnerability specifically targets the HTTP request parsing mechanism within the server software, where improper handling of malformed GET requests leads to system instability and complete service disruption. The flaw manifests when attackers submit GET requests containing excessively long strings without including the required HTTP version number, triggering an unhandled exception that causes the server process to terminate unexpectedly. This type of vulnerability falls under the category of improper input validation and buffer handling issues that have been consistently documented in security frameworks.
The technical implementation of this vulnerability stems from inadequate string length validation within the HTTP request processing pipeline of Tiny Server. When the server receives a GET request lacking an HTTP version specification, it attempts to parse the request line without proper bounds checking on the string length. The parsing routine fails to account for excessively long input sequences, leading to buffer overflows or memory corruption conditions that result in process termination. This behavior aligns with common software security weaknesses documented in CWE-129, which addresses issues related to insufficient validation of length of input buffers. The vulnerability represents a classic example of how malformed input can be exploited to trigger system crashes, particularly in embedded or lightweight server implementations that may not include comprehensive error handling mechanisms.
From an operational perspective, this vulnerability presents significant risk to organizations relying on Tiny Server for web services, as remote attackers can easily exploit the flaw to cause service outages without requiring authentication or advanced technical skills. The impact extends beyond simple denial of service, as the crash condition can be repeatedly triggered to maintain service disruption, potentially leading to extended downtime and loss of availability for legitimate users. The vulnerability's exploitation requires minimal effort from attackers, as they only need to craft a simple HTTP GET request with a long string parameter, making it particularly dangerous in environments where such servers are exposed to untrusted network traffic. This type of attack can be classified under the ATT&CK technique T1499.004, which describes network denial of service attacks, and specifically targets the availability aspect of the CIA triad.
Organizations affected by this vulnerability should prioritize immediate remediation through software updates to version 1.1.10 or later, which contains patches addressing the buffer handling issues in the HTTP request parser. Additionally, network-level mitigations such as implementing rate limiting, request length restrictions, and intrusion detection systems can provide temporary protection while updates are deployed. Security configurations should include enabling proper input validation mechanisms and implementing request filtering to prevent malformed requests from reaching the vulnerable parsing components. The vulnerability highlights the importance of robust input validation practices and proper memory management in server software, particularly in lightweight implementations where resource constraints may lead to insufficient error handling. Organizations should also consider implementing monitoring solutions to detect unusual request patterns that may indicate attempted exploitation of similar vulnerabilities.