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Vulnerability DatabaseCVE-2020-27796
CVE-2020-27796:
NixOS vulnerability analysis and mitigation
Overview
A heap-based buffer over-read vulnerability was discovered in the invert_pt_dynamic function of UPX version 3.96 and earlier (Debian Tracker).
Technical details
The vulnerability exists in the PackLinuxElf32::invert_pt_dynamic function within p_lx_elf.cpp. The issue manifests as a heap buffer overflow when reading beyond allocated memory boundaries, specifically reading 4 bytes at an invalid address location. The vulnerability is tracked as CWE-119 (Buffer Overflow) (NVD CNA Status).
Impact
The vulnerability could potentially lead to program crashes or denial of service conditions when processing malformed ELF files.
Exploitability
A proof-of-concept exploit has been demonstrated that triggers the heap buffer overflow during the unpacking process of specially crafted files. The vulnerability can be triggered using the upx -d command on malformed input files (GitHub Issue).
Mitigation and workarounds
The vulnerability has been fixed in newer versions of UPX. Users should upgrade to a patched version of the software (Debian Tracker).
Additional resources
Source: This report was generated using AI
Related NixOS vulnerabilities:
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