CVE-2017-7612 in elfutils
Summary
by MITRE
The check_sysv_hash function in elflint.c in elfutils 0.168 allows remote attackers to cause a denial of service (heap-based buffer over-read and application crash) via a crafted ELF file.
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Analysis
by VulDB Data Team • 11/28/2022
The vulnerability identified as CVE-2017-7612 represents a critical heap-based buffer over-read flaw within the elfutils 0.168 library, specifically in the check_sysv_hash function located in elflint.c. This issue arises from inadequate input validation when processing ELF (Executable and Linkable Format) files, which are fundamental binary formats used across Unix-like operating systems for executables, object code, and shared libraries. The flaw enables remote attackers to craft malicious ELF files that can trigger unexpected memory access patterns during the verification process, leading to application instability and potential system compromise.
The technical implementation of this vulnerability stems from improper bounds checking within the ELF file parsing logic. When the check_sysv_hash function processes a specially crafted ELF file, it attempts to read memory locations beyond the allocated buffer boundaries, resulting in a heap-based buffer over-read condition. This type of vulnerability falls under CWE-121, which describes heap-based buffer overflow conditions, and is particularly dangerous because it can be exploited remotely without requiring local system access. The vulnerability manifests as an application crash during the ELF file validation process, effectively creating a denial of service condition that prevents legitimate users from accessing the affected system or application.
The operational impact of CVE-2017-7612 extends beyond simple service disruption, as it can be leveraged as part of broader attack vectors within the MITRE ATT&CK framework. Specifically, this vulnerability aligns with the Tactic of Execution and the technique of Valid Accounts, where attackers can exploit the denial of service condition to disrupt critical services or as a precursor to more sophisticated attacks. Systems that rely on elfutils for ELF file validation, including security scanning tools, system monitoring applications, and automated build environments, become vulnerable to this attack. The vulnerability is particularly concerning in environments where automated processing of untrusted ELF files occurs, such as package repositories, software distribution centers, or security analysis platforms that process unknown binaries.
Mitigation strategies for CVE-2017-7612 should prioritize immediate patching of affected elfutils installations to version 0.170 or later, where the buffer over-read issue has been resolved through proper input validation and bounds checking. System administrators should implement network segmentation and access controls to limit exposure of systems that process untrusted ELF files, while also deploying intrusion detection systems that can identify suspicious file processing patterns. Organizations should conduct comprehensive vulnerability assessments to identify all systems running affected versions of elfutils and establish monitoring procedures to detect potential exploitation attempts. The remediation process should include not only patching but also implementing robust input validation mechanisms and regular security updates to prevent similar vulnerabilities from emerging in other components of the system architecture.