Worse, some systems decode input multiple times (double decoding). An attacker might send:
: Indicates an action or command used by a script or application to retrieve a remote or local resource. 3A : The URL-encoded representation of a colon ( : ). 2F : The URL-encoded representation of a forward slash ( / ).
192.168.1.100 - - [15/May/2025:10:23:45 +0000] "GET /api/fetch?url=file-3A-2F-2F-2Froot-2F.aws-2Fconfig HTTP/1.1" 400 512 fetch-url-file-3A-2F-2F-2Froot-2F.aws-2Fconfig
This article explains how to interpret, retrieve, and securely handle a resource referenced as the encoded path "fetch-url-file-3A-2F-2F-2Froot-2F.aws-2Fconfig" — a URL-like token representing the file path "/root/.aws/config". It covers decoding, common contexts where the file is used, how to safely fetch it, and security/privacy considerations.
: Decodes to .aws/config , the default configuration file for the Amazon Web Services (AWS) Command Line Interface (CLI). 2. The Mechanics of the Attack Worse, some systems decode input multiple times (double
sudo chmod 700 /root/.aws sudo chmod 600 /root/.aws/config sudo chmod 600 /root/.aws/credentials
A 400 response suggests the application rejected the request, but a 200 with the file contents indicates a successful breach. 2F : The URL-encoded representation of a forward slash ( / )
Requires root privileges.
The string file-3A-2F-2F-2Froot-2F.aws-2Fconfig is a specific, highly targeted variation aimed at the root AWS configuration file. It shows that the attacker has prior knowledge of Linux filesystem structure and AWS CLI default paths.
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