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CVE-2019-10743 is a Zip Slip path traversal vulnerability in the Go archive library mholt/archiver affecting versions prior to 3.3.2. The issue is in the library's archive extraction ("unarchive") functionality, which allowed filenames from a crafted archive to be concatenated to the destination extraction path without sufficiently neutralizing traversal sequences such as "../". As a result, an attacker could supply a malicious ZIP archive containing entries like "../../file.exe" and cause extraction outside the intended target directory. The repository history referenced path sanitization fixes and related handling for symlink-based traversal, indicating the flaw was rooted in unsafe path handling during extraction.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository is a proof-of-concept (POC) demonstration of the Zip Slip vulnerability (CVE-2019-10743) in the mholt/archiver Go package (versions >=3.0.0, <3.3.2). The main exploit is implemented as a vulnerable Go web server (main.go) that accepts ZIP file uploads via the /upload HTTP endpoint and extracts them using the vulnerable archiver package, without validating file paths. This allows attackers to craft ZIP files with path traversal entries (e.g., '../../../etc/passwd'), resulting in arbitrary file overwrite outside the intended extraction directory. The repository includes: - main.go: The vulnerable server implementation, exposing endpoints '/' (upload form) and '/upload' (ZIP file upload and extraction). - test_exploit.py: A Python script that creates a malicious ZIP file with a path traversal filename and uploads it to the server to demonstrate exploitation. - docker-run.sh and Dockerfile: Scripts and configuration to build and run the vulnerable server in a Docker container. - README.md: Documentation explaining the vulnerability, usage instructions, and mitigation steps. The exploit's main capability is arbitrary file overwrite on the server via a crafted ZIP file, which can lead to remote code execution or system compromise. The attack vector is network-based, requiring the attacker to send a malicious ZIP file to the /upload endpoint. The server listens on http://localhost:8080 by default, and stores files in ./uploads and ./extracted directories. The exploit is a POC and does not include weaponized payloads, but demonstrates the core vulnerability and its impact.
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Zip Slip directory traversal vulnerability in a Go-based archive library allowing extraction of files outside the target folder.
A Zip Slip path traversal vulnerability in a Go-based archive library that allows extraction of files outside the target directory via ../ sequences in zip entry filenames.
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