GHSA-9f46-5r25-5wfm

Suggest an improvement
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
Published
2021-06-29T03:13:28Z
Modified
2024-02-16T08:21:35.601880Z
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: - 1.x: https://github.com/thephpleague/flysystem/commit/f3ad69181b8afed2c9edf7be5a2918144ff4ea32 - 2.x: https://github.com/thephpleague/flysystem/commit/a3c694de9f7e844b76f9d1b61296ebf6e8d89d74

Workarounds

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

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

Affected packages

Packagist / league/flysystem

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown 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

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