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steghide 0.5.1 uses a predictable 32-bit seed value for its data hiding process, which allows attackers to more easily detect the presence of hidden data within files. The use of a non-random or insufficiently random seed undermines the security of the steganographic method employed by steghide.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository contains 'Stegcrack', a C++ tool designed to exploit CVE-2021-27211, a vulnerability in Steghide's password-to-seed derivation. The tool brute-forces the 32-bit seed used by Steghide to hide data, allowing extraction of hidden content without knowing the original password. The repository is structured with a clear separation of concerns: file handling (src/file_handling.cc), extraction logic (src/Extractor.cc), user interface (src/ui.cc), and utility functions (src/utils.cc). The main entry point is src/main.cc, which orchestrates the process: it loads the target file, detects its type (currently only JPEG is supported), brute-forces possible seeds in parallel, and attempts to extract any hidden data. If successful, the user is prompted to save the extracted data. The exploit is operational and can fully extract plaintext data if Steghide's encryption was disabled during embedding, or extract the encrypted payload otherwise. No network endpoints are present; the attack vector is local, requiring access to the target file. The code is well-structured and focused on exploiting a specific cryptographic weakness in Steghide.
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