CVE-2016-5030 in libdwarf
Summary
by MITRE
The _dwarf_calculate_info_section_end_ptr function in libdwarf before 20160923 allows remote attackers to cause a denial of service (NULL pointer dereference) via a crafted file.
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Analysis
by VulDB Data Team • 08/15/2020
The vulnerability identified as CVE-2016-5030 resides within the libdwarf library, a critical component used for processing debug information in binary files, particularly those following the dwarf debugging format standard. This library serves as an essential tool for developers and security professionals who need to analyze program binaries and their associated debugging data. The flaw manifests in the _dwarf_calculate_info_section_end_ptr function which is responsible for determining the end pointer of debug information sections within compiled binaries. When processing malformed or crafted input files, this function fails to properly validate input parameters, leading to a condition where a NULL pointer dereference occurs. Such a scenario represents a fundamental failure in memory management and input validation practices that can be exploited by malicious actors to disrupt system operations.
The technical nature of this vulnerability places it squarely within the category of denial of service attacks, specifically targeting memory corruption patterns that result in system instability. The flaw operates by exploiting the absence of proper input validation checks within the dwarf_calculate_info_section_end_ptr function, where the code assumes certain memory addresses will contain valid data without verifying their existence or legitimacy. This particular vulnerability aligns with CWE-476, which describes NULL pointer dereference conditions, and demonstrates how improper handling of input data can lead to system crashes and service interruptions. The attack vector requires remote exploitation through the processing of maliciously crafted files, making it particularly concerning for systems that automatically process or analyze binary content from untrusted sources. When an attacker successfully triggers this vulnerability, the system crashes due to attempting to access memory through a NULL pointer reference, effectively rendering the affected service unavailable to legitimate users.
The operational impact of CVE-2016-5030 extends beyond simple service disruption to potentially compromise system availability and integrity in environments where libdwarf is extensively utilized. Systems that rely on debug information processing, including software development tools, security analysis frameworks, and binary analysis utilities, become vulnerable to this attack. The vulnerability can be particularly dangerous in automated environments where files are continuously processed without human intervention, as a single malicious file could cause cascading failures across multiple services. This flaw also represents a potential entry point for more sophisticated attacks, as initial denial of service conditions often precede more complex exploitation techniques. Organizations using affected versions of libdwarf should consider the broader implications for their security posture, as this vulnerability can be leveraged to create conditions that facilitate further compromise. The attack requires no special privileges and can be executed through simple file processing, making it accessible to a wide range of threat actors.
Mitigation strategies for CVE-2016-5030 focus primarily on updating to patched versions of the libdwarf library, specifically those released after September 23, 2016, when the vulnerability was addressed. System administrators should implement comprehensive patch management procedures to ensure all affected software components receive timely updates. Additionally, input validation measures should be strengthened at multiple layers, including implementing proper error handling and memory safety checks in applications that utilize libdwarf functionality. The implementation of sandboxing techniques for processing untrusted binary files can provide an additional protective barrier against exploitation attempts. Organizations should also consider monitoring for unusual system behavior that might indicate exploitation attempts, as the denial of service condition can be used as a precursor to more sophisticated attacks. Security teams should review their incident response procedures to ensure preparedness for handling denial of service attacks targeting debugging libraries, as these incidents can significantly impact development and security analysis workflows. The vulnerability underscores the importance of maintaining up-to-date security libraries and implementing robust input validation practices across all system components that process external data.