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CVE-2021-32708

CVE-2021-32708 · Time-of-check Time-of-use (TOCTOU) Race Condition in league/flysystem

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Flysystem is an open source file storage library for PHP. The whitespace normalisation using in 1.x and 2.x removes any unicode whitespace. Under certain specific conditions this could potentially allow a malicious user to execute code remotely. The conditions are: A user is allowed to supply the path or filename of an uploaded file, the supplied path or filename is not checked against unicode chars, the supplied pathname checked against an extension deny-list, not an allow-list, the supplied path or filename contains a unicode whitespace char in the extension, the uploaded file is stored in a directory that allows PHP code to be executed. Given these conditions are met a user can upload and execute arbitrary code on the system under attack. The unicode whitespace removal has been replaced with a rejection (exception). For 1.x users, upgrade to 1.1.4. For 2.x users, upgrade to 2.1.1.

CVSS 9.8 · Critical · EPSS 3.5% · Fix available

Published
Updated

Stack: system · php

Affected products and versions

  • flysystem

    Versions
    • < 1.1.4: Affected
    • >= 2.0.0, < 2.1.1: Affected

    No fix published

  • php-league-flysystem Debian:12

    Affected ranges
    • ECOSYSTEM: < 1.1.3-4

    Update to 1.1.3-4

  • php-league-flysystem Debian:13

    Affected ranges
    • ECOSYSTEM: < 1.1.3-4

    Update to 1.1.3-4

  • php-league-flysystem Debian:14

    Affected ranges
    • ECOSYSTEM: < 1.1.3-4

    Update to 1.1.3-4

  • league/flysystem Packagist

    Versions
    • 0.1.0
    • 0.1.1
    • 0.1.10
    • 0.1.11
    • 0.1.12
    • 0.1.13
    • 0.1.14
    • 0.1.15
    • 0.1.16
    • 0.1.17
    • 0.1.18
    • 0.1.19
    • 0.1.2
    • 0.1.20
    • 0.1.3
    • 0.1.4
    • 0.1.5
    • 0.1.6
    • 0.1.7
    • 0.1.8
    • 0.1.9
    • 0.2.0
    • 0.2.1
    • 0.2.10
    • 0.2.11
    • 0.2.12
    • 0.2.13
    • 0.2.14
    • 0.2.15
    • 0.2.2
    • 0.2.3
    • 0.2.4
    • 0.2.5
    • 0.2.6
    • 0.2.7
    • 0.2.8
    • 0.2.9
    • 0.3.0
    • 0.3.1
    • 0.3.2
    • 0.3.3
    • 0.3.4
    • 0.3.5
    • 0.4.0
    • 0.4.1
    • 0.4.2
    • 0.4.3
    • 0.4.4
    • 0.4.5
    • 0.5.0
    • 0.5.1
    • 0.5.10
    • 0.5.11
    • 0.5.12
    • 0.5.2
    • 0.5.3
    • 0.5.4
    • 0.5.5
    • 0.5.6
    • 0.5.7
    • 0.5.8
    • 0.5.9
    • 1.0.0
    • 1.0.0-alpha1
    • 1.0.1
    • 1.0.10
    • 1.0.11
    • 1.0.12
    • 1.0.13
    • 1.0.14
    • 1.0.15
    • 1.0.16
    • 1.0.17
    • 1.0.18
    • 1.0.19
    • 1.0.2
    • 1.0.20
    • 1.0.21
    • 1.0.22
    • 1.0.23
    • 1.0.24
    • 1.0.25
    • 1.0.26
    • 1.0.27
    • 1.0.28
    • 1.0.29
    • 1.0.3
    • 1.0.30
    • 1.0.31
    • 1.0.32
    • 1.0.33
    • 1.0.34
    • 1.0.35
    • 1.0.36
    • 1.0.37
    • 1.0.38
    • 1.0.39
    • 1.0.4
    • 1.0.40
    • 1.0.41
    • 1.0.42
    • 1.0.43
    • 1.0.44
    • 1.0.45
    • 1.0.46
    • 1.0.47
    • 1.0.48
    • 1.0.49
    • 1.0.5
    • 1.0.50
    • 1.0.51
    • 1.0.52
    • 1.0.53
    • 1.0.54
    • 1.0.55
    • 1.0.56
    • 1.0.57
    • 1.0.58
    • 1.0.59
    • 1.0.6
    • 1.0.60
    • 1.0.61
    • 1.0.62
    • 1.0.63
    • 1.0.64
    • 1.0.65
    • 1.0.66
    • 1.0.67
    • 1.0.68
    • 1.0.69
    • 1.0.7
    • 1.0.70
    • 1.0.8
    • 1.0.9
    • 1.1.0
    • 1.1.1
    • 1.1.2
    • 1.1.3
    Affected ranges
    • ECOSYSTEM: < 1.1.4

    Update to 1.1.4

  • league/flysystem Packagist

    Versions
    • 2.0.0
    • 2.0.1
    • 2.0.2
    • 2.0.3
    • 2.0.4
    • 2.0.5
    • 2.0.6
    • 2.0.7
    • 2.0.8
    • 2.1.0
    Affected ranges
    • ECOSYSTEM: ≥ 2.0.0, < 2.1.1

    Update to 2.1.1

  • php-league-flysystem Ubuntu:16.04:LTS

    Versions
    • 1.0.15-1
    • 1.0.16-1
    • 1.0.16-1build1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • php-league-flysystem Ubuntu:22.04:LTS

    Versions
    • 1.1.3-4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • php-league-flysystem Ubuntu:24.04:LTS

    Versions
    • 1.1.10-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • php-league-flysystem Ubuntu:25.10

    Versions
    • 3.29.1-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • php-league-flysystem Ubuntu:26.10

    Versions
    • 3.29.1-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • php-league-flysystem Ubuntu:26.04:LTS

    Versions
    • 3.29.1-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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