CVE-2022-34299 in libdwarf
Summary
by MITRE • 06/23/2022
There is a heap-based buffer over-read in libdwarf 0.4.0. This issue is related to dwarf_global_formref_b.
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Analysis
by VulDB Data Team • 06/24/2022
The heap-based buffer over-read vulnerability in libdwarf 0.4.0 represents a critical security flaw that affects the Dwarf debugging information processing library widely used in software development and analysis tools. This vulnerability specifically manifests within the dwarf_global_formref_b function, which is responsible for handling debugging information entries in dwarf format. The issue occurs when the library attempts to read beyond the boundaries of allocated heap memory while processing malformed or specially crafted dwarf debugging data structures. Such buffer over-read conditions can lead to unpredictable behavior including application crashes, data corruption, or potentially exploitable memory access violations that may allow attackers to execute arbitrary code or escalate privileges within affected systems. The vulnerability stems from insufficient bounds checking in the memory management routines that handle dwarf debugging information parsing, particularly when processing global form reference entries that are used to establish relationships between different debugging data elements.
The technical implementation of this flaw involves the improper handling of memory allocation and access patterns during dwarf debugging data processing. When the dwarf_global_formref_b function processes debugging information, it reads from heap-allocated memory regions without adequate validation of buffer boundaries. This allows an attacker to craft malicious dwarf debugging data that causes the function to read past the allocated memory space, potentially accessing adjacent memory locations containing sensitive information or control data. The vulnerability is particularly concerning because libdwarf is extensively used in various security tools, compilers, debuggers, and system analysis utilities, making it a prime target for exploitation in supply chain attacks or privilege escalation scenarios. The flaw operates at the intersection of software debugging infrastructure and memory safety, where the expected behavior of reading structured debugging data becomes a vector for memory corruption attacks.
The operational impact of this vulnerability extends across multiple domains including software development environments, security analysis tools, and system monitoring applications that rely on libdwarf for processing debugging information. Attackers could exploit this vulnerability by embedding malicious dwarf data within software packages or debugging files, potentially leading to denial of service conditions, information disclosure, or remote code execution depending on the execution context. The vulnerability affects systems where libdwarf is integrated into compilers, debuggers, security scanners, or forensic analysis tools, creating widespread potential impact across development and security operations. Organizations using software development tools, continuous integration pipelines, or security analysis frameworks may experience system instability or compromise when processing files containing maliciously crafted dwarf debugging information. The vulnerability's exploitation potential is amplified by the fact that many development and security tools automatically process debugging information without proper input validation, creating numerous attack vectors throughout the software development lifecycle.
Mitigation strategies for this vulnerability should focus on immediate software updates and patches provided by libdwarf maintainers, along with defensive programming practices to prevent similar issues in related codebases. System administrators and security teams should prioritize patching affected systems and monitoring for potential exploitation attempts, particularly in environments where untrusted dwarf debugging data is processed. The implementation of input validation and bounds checking mechanisms should be enhanced in all applications that process debugging information or similar structured data formats. Additionally, organizations should consider implementing runtime protections such as address space layout randomization, stack canaries, and memory protection mechanisms to reduce the exploitability of similar buffer over-read vulnerabilities. This vulnerability aligns with CWE-125, which addresses out-of-bounds read conditions, and may map to ATT&CK techniques involving privilege escalation and code execution through memory corruption vulnerabilities. Regular security assessments of debugging and analysis tools, along with proper input sanitization procedures, are essential to prevent exploitation of similar memory safety issues in the broader software ecosystem.