GHSA-9f46-5r25-5wfm

Source

https://github.com/advisories/GHSA-9f46-5r25-5wfm

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/06/GHSA-9f46-5r25-5wfm/GHSA-9f46-5r25-5wfm.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-9f46-5r25-5wfm

Aliases

CVE-2021-32708

Published

2021-06-29T03:13:28Z

Modified

2026-07-08T06:28:00Z

Severity

9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator

Summary

Time-of-check Time-of-use (TOCTOU) Race Condition in league/flysystem

Details

Impact

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:

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.

Patches

The unicode whitespace removal has been replaced with a rejection (exception).

The library has been patched in:

Workarounds

For 1.x users, upgrade to 1.1.4. For 2.x users, upgrade to 2.1.1.

Database specific

{
    "cwe_ids": [
        "CWE-367"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-06-24T18:03:15Z",
    "nvd_published_at": "2021-06-24T17:15:00Z",
    "severity": "CRITICAL"
}

References

Affected packages

Packagist / league/flysystem

Package

Name: league/flysystem
Purl: pkg:composer/league/flysystem

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1.1.4

Affected versions

0.*

0.1.0

0.1.1

0.1.2

0.1.3

0.1.4

0.1.5

0.1.6

0.1.7

0.1.8

0.1.9

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

0.1.20

0.2.0

0.2.1

0.2.2

0.2.3

0.2.4

0.2.5

0.2.6

0.2.7

0.2.8

0.2.9

0.2.10

0.2.11

0.2.12

0.2.13

0.2.14

0.2.15

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

0.5.2

0.5.3

0.5.4

0.5.5

0.5.6

0.5.7

0.5.8

0.5.9

0.5.10

0.5.11

0.5.12

1.*

1.0.0-alpha1

1.0.0

1.0.1

1.0.2

1.0.3

1.0.4

1.0.5

1.0.6

1.0.7

1.0.8

1.0.9

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

1.0.20

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

1.0.30

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

1.0.40

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

1.0.50

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

1.0.60

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

1.0.70

1.1.0

1.1.1

1.1.2

1.1.3

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/06/GHSA-9f46-5r25-5wfm/GHSA-9f46-5r25-5wfm.json"

Packagist / league/flysystem

Package

Name: league/flysystem
Purl: pkg:composer/league/flysystem

Affected ranges

Type: ECOSYSTEM
Events: Introduced

2.0.0

Fixed

2.1.1

Affected versions

2.*

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

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/06/GHSA-9f46-5r25-5wfm/GHSA-9f46-5r25-5wfm.json"