Asymmetric Resource Consumption (Zip Bomb) Affecting python package, versions [3.8.0,3.8.19)[3.9.0,3.9.19)[3.10.0,3.10.14)[3.11.0,3.11.9)[3.12.0,3.12.3)


Severity

Recommended
0.0
medium
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

EPSS
0.05% (19th percentile)

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  • Snyk IDSNYK-UNMANAGED-PYTHON-7924823
  • published9 Sept 2024
  • disclosed19 Mar 2024
  • creditdyingc

Introduced: 19 Mar 2024

CVE-2024-0450  (opens in a new tab)
CWE-405  (opens in a new tab)

How to fix?

Upgrade python to version 3.8.19, 3.9.19, 3.10.14, 3.11.9, 3.12.3 or higher.

Overview

Affected versions of this package are vulnerable to Asymmetric Resource Consumption (Zip Bomb) in the zipfile module. An attacker can create a zip-bomb with a high compression ratio that exploits the zip format to overlap entries in the archive.

Workaround

Thee following check can be used before extracting a ZIP file.

# zipf is an open ZipFile
end_offset = zipf.start_dir
for zinfo in sorted(zipf.filelist,
                    key=lambda zinfo: zinfo.header_offset,
                    reverse=True):
    if zinfo.header_offset + zinfo.compress_size > end_offset:
        raise zipfile.BadZipFile('Overlapped entries')
    end_offset = zinfo.header_offset

CVSS Scores

version 3.1