Heap-buffer-overflow in libdwarf: _dwarf_memcpy_noswap_bytes
Summary
OSV-2023-977: Heap-buffer-overflow in _dwarf_memcpy_noswap_bytes. Affects libdwarf versions >= e612fb75b2b75ff78f550aea7c659799432f5bb4, < 3a658bd1dd7437948cecbf82bb9b24f5f6122a7d. Fixed in 3a658bd1dd7437948cecbf82bb9b24f5f6122a7d. How to fix ↓
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Background
libdwarf is an open-source library that provides access to DWARF debugging information in object files. It is commonly used in software development tools and debuggers. The library allows developers to extract and analyze debugging information, such as variable names, types, and source code locations, from compiled binaries. However, a vulnerability has been discovered in libdwarf that could lead to a heap-buffer-overflow.
Vulnerability Detail
The vulnerability in libdwarf, specifically in the function _dwarf_memcpy_noswap_bytes, allows for a heap-buffer-overflow read of 8 bytes. This can result in a crash or potentially be exploited by an attacker to execute arbitrary code. The issue was reported through the OSS-Fuzz project and has been assigned a medium severity level. The crash state indicates that the overflow occurs in the function fill_in_uni_arch_64, which is called by _dwarf_macho_setup.
How To Fix
Minimum fixed version
3a658bd1dd7437948cecbf82bb9b24f5f6122a7d
This is the first release that contains the fix.
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Workaround
As a temporary workaround, developers can implement input validation and bounds checking in their own code to prevent the heap-buffer-overflow from occurring. By ensuring that the input data is within the expected boundaries, the vulnerability can be mitigated. Here is an example of how to perform bounds checking in C:
void process_data(const char* data, size_t length) {
if (length > MAX_LENGTH) {
// Handle error or truncate data
}
// Process the data
}
Conclusion
In conclusion, a heap-buffer-overflow vulnerability has been discovered in libdwarf, which could potentially lead to a crash or arbitrary code execution. It is crucial for developers to update their dependencies or rebuild their software using the patched version of libdwarf to mitigate this vulnerability. If you need further assistance or support in addressing this vulnerability, please contact DevNack.com.
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FAQ
libdwarf is an open-source library that provides access to DWARF debugging information in object files. It is commonly used in software development tools and debuggers.
A heap-buffer-overflow is a type of memory corruption vulnerability where data is written or read outside the bounds of a heap-allocated buffer. In this case, the overflow occurs in the _dwarf_memcpy_noswap_bytes function of libdwarf.
If successfully exploited, this vulnerability could allow an attacker to execute arbitrary code or cause a denial-of-service by crashing the application that uses libdwarf.
Yes, the vulnerability has been fixed in the libdwarf library. Developers are advised to update their dependencies or rebuild their software using the patched version of libdwarf.
You can find more information about this vulnerability in the OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=63024
References
Related vulnerabilities
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