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CVE-2021-32708 PoC — thephpleague flysystem 代码注入漏洞

来源
关联漏洞
标题: thephpleague flysystem 代码注入漏洞 (CVE-2021-32708)
Description:Flysystem是一个开源文件存储库。 thephpleague flysystem存在代码注入漏洞,该漏洞源于在某些特定条件下,flysystem可能允许恶意用户远程执行代码。
Description
Affected versions of this package are vulnerable to Race Condition. 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.
介绍
# CVE-2021-32708
Affected versions of this package are vulnerable to Race Condition. 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.
How the Exploit Works

Unicode Bypass: The filename exploit\u202Ephp.txt uses the Right-to-Left Override (RLO) character to disguise the file extension.

Malicious File Upload: The file is uploaded and stored on the server.

Payload Execution: If the server allows code execution in the uploads directory, the attacker can run the PHP payload remotely.
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