CVE-2021-32708
Flysystem Remote Code Execution
Description
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.
INFO
Published Date :
June 24, 2021, 5:15 p.m.
Last Modified :
Nov. 7, 2023, 3:35 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
5.9
Exploitability Score :
3.9
Public PoC/Exploit Available at Github
CVE-2021-32708 has a 1 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-32708.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Clones a Github repository with PHP & ZipArchive. Without using Git or exec().
composer-library github php zipfile
PHP Dockerfile
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-32708 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-32708 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Nov. 07, 2023
Action Type Old Value New Value Added Reference GitHub, Inc. https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RNZSWK4GOMJOOHKLZEOE5AQSLC4DNCRZ/ [No types assigned] Added Reference GitHub, Inc. https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NWPTENBYKI2IG47GI4DHAACLNRLTWUR5/ [No types assigned] Removed Reference GitHub, Inc. https://lists.fedoraproject.org/archives/list/[email protected]/message/RNZSWK4GOMJOOHKLZEOE5AQSLC4DNCRZ/ Removed Reference GitHub, Inc. https://lists.fedoraproject.org/archives/list/[email protected]/message/NWPTENBYKI2IG47GI4DHAACLNRLTWUR5/ -
Modified Analysis by [email protected]
Sep. 20, 2021
Action Type Old Value New Value Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/NWPTENBYKI2IG47GI4DHAACLNRLTWUR5/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/NWPTENBYKI2IG47GI4DHAACLNRLTWUR5/ Mailing List, Third Party Advisory Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/RNZSWK4GOMJOOHKLZEOE5AQSLC4DNCRZ/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/RNZSWK4GOMJOOHKLZEOE5AQSLC4DNCRZ/ Mailing List, Third Party Advisory Added CWE NIST CWE-367 Added CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Jul. 04, 2021
Action Type Old Value New Value Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/RNZSWK4GOMJOOHKLZEOE5AQSLC4DNCRZ/ [No Types Assigned] Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/NWPTENBYKI2IG47GI4DHAACLNRLTWUR5/ [No Types Assigned] -
Initial Analysis by [email protected]
Jul. 01, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:C/I:C/A:C) Added CVSS V3.1 NIST AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Changed Reference Type https://github.com/thephpleague/flysystem/commit/a3c694de9f7e844b76f9d1b61296ebf6e8d89d74 No Types Assigned https://github.com/thephpleague/flysystem/commit/a3c694de9f7e844b76f9d1b61296ebf6e8d89d74 Patch, Third Party Advisory Changed Reference Type https://github.com/thephpleague/flysystem/commit/f3ad69181b8afed2c9edf7be5a2918144ff4ea32 No Types Assigned https://github.com/thephpleague/flysystem/commit/f3ad69181b8afed2c9edf7be5a2918144ff4ea32 Patch, Third Party Advisory Changed Reference Type https://github.com/thephpleague/flysystem/security/advisories/GHSA-9f46-5r25-5wfm No Types Assigned https://github.com/thephpleague/flysystem/security/advisories/GHSA-9f46-5r25-5wfm Patch, Third Party Advisory Changed Reference Type https://packagist.org/packages/league/flysystem No Types Assigned https://packagist.org/packages/league/flysystem Product, Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:thephpleague:flysystem:*:*:*:*:*:*:*:* versions from (including) 1.0.0 up to (excluding) 1.1.4 *cpe:2.3:a:thephpleague:flysystem:*:*:*:*:*:*:*:* versions from (including) 2.0.0 up to (excluding) 2.1.1
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-32708 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-32708
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.71 }} 0.05%
score
0.79903
percentile