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GHSA-94vh-gphv-8pm8
No affected components available
Summary
In the archive extraction routine of affected versions of the zip crate, symbolic links earlier in the archive are allowed to be used for later files in the archive without validation of the final canonicalized path, allowing maliciously crafted archives to overwrite arbitrary files in the file system when extracted.
Details
This is a variant of the zip-slip vulnerability, we can make the extraction logic step outside of the target directory by creating a symlink to the parent directory and then extracting further files through that symlink.
The documentation of the [::zip::read::ZipArchive::extract] method is in my opinion implying this should not happen:
"Paths are sanitized with ZipFile::enclosed_name." ... [
::zip::read::FileOptions::enclosed_name] ... is resistant to path-based exploits ... can’t resolve to a path outside the current directory.
Most archive software either decline to extract symlinks that traverse out of the directory or defer creation of symlinks after all files have been created to prevent unexpected behavior when later entries depend on earlier symbolic link entries.
PoC
https://gist.github.com/eternal-flame-AD/bf71ef4f6828e741eb12ce7fd47b7b85
Impact
Users who extract untrusted archive files using the following high-level API method may be affected and critical files on the system may be overwritten with arbitrary file permissions, which can potentially lead to code execution.
- zip::unstable::stream::ZipStreamReader::extract
- zip::read::ZipArchive::extract
The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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