CVE-2024-34403 in uriparser
Summary
by MITRE • 05/03/2024
An issue was discovered in uriparser through 0.9.7. ComposeQueryMallocExMm in UriQuery.c has an integer overflow via a long string.
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Analysis
by VulDB Data Team • 03/20/2025
The vulnerability identified as CVE-2024-34403 affects the uriparser library version 0.9.7 and earlier, representing a critical integer overflow condition within the ComposeQueryMallocExMm function located in UriQuery.c. This library serves as a fundamental component for URI parsing and manipulation across numerous software applications and systems. The integer overflow occurs when processing exceptionally long query strings, creating a scenario where arithmetic operations exceed the maximum representable value for the integer type, potentially leading to unexpected behavior and system instability. The flaw manifests specifically during the memory allocation process for query string composition, where the library attempts to calculate required memory space based on input string length.
The technical implementation of this vulnerability stems from inadequate input validation and overflow checking within the memory allocation routine. When a maliciously crafted query string exceeds the bounds of the integer data type used for calculations, the arithmetic overflow results in a negative or truncated value being passed to memory allocation functions. This creates a potential for heap-based memory corruption, where the application may attempt to allocate an unexpectedly small amount of memory or even negative memory space. The vulnerability is particularly concerning because it can be exploited through crafted URI inputs that are processed by applications relying on uriparser for URI handling. Attackers can leverage this weakness to manipulate memory layout, potentially leading to arbitrary code execution or denial of service conditions.
The operational impact of CVE-2024-34403 extends across numerous software ecosystems that depend on uriparser for URI processing capabilities. Applications including web browsers, network monitoring tools, web application firewalls, and various network utilities that utilize this library for parsing and constructing URIs become vulnerable to exploitation. The vulnerability creates a pathway for attackers to cause application crashes, memory corruption, or potentially achieve remote code execution depending on the target system's memory management and protection mechanisms. Systems processing user-supplied URI data, such as web servers handling URL parameters or network devices parsing URI-based protocols, face increased risk exposure. The integer overflow can also contribute to information disclosure vulnerabilities when memory corruption affects adjacent memory regions containing sensitive data.
Mitigation strategies for this vulnerability require immediate attention from system administrators and software maintainers. The primary and most effective solution involves upgrading to uriparser version 0.9.8 or later, where the integer overflow has been addressed through proper input validation and overflow checking mechanisms. Organizations should implement comprehensive patch management procedures to ensure all affected systems receive the updated library versions. Additional defensive measures include input sanitization at application layers, where URI data is validated and normalized before being passed to uriparser functions, and implementing strict limits on query string lengths to prevent exploitation attempts. Network monitoring solutions should be configured to detect unusual URI patterns that might indicate exploitation attempts. The vulnerability aligns with CWE-190, Integer Overflow or Wraparound, and represents a potential entry point for techniques described in the ATT&CK framework under T1203, Exploitation for Client Execution, and T1499, Endpoint Denial of Service, making it a significant concern for enterprise security postures and compliance requirements.