GHSA-m3cr-vc2j-pm27: Coder vulnerable to workspace auto-creation via crafted URL parameters without user consent

Command injection via dotfiles URI parameter combined with workspace auto-creation Summary The dotfiles registry module passed unsanitized user input to shell commands, allowing arbitrary code execution inside a provisioned workspace. Any user who supplied a crafted dotfiles_uri value (for example, one containing shell command substitution such as $(...)) could achieve command execution in their own workspace. The Create Workspace page's mode=auto deep links amplified this into a one-click attack: an attacker could craft a URL that prefilled param.dotfiles_uri and silently provisioned a workspace with the attacker-controlled value, with no explicit user confirmation. Details Command injection in the dotfiles module (root cause) The dotfiles module interpolated the user-provided dotfiles_uri value directly into a shell script and executed it without input validation. Because the value was expanded by the shell, payloads using command substitution ($(...)), command separators (;, |, &&), or backticks were interpreted before the coder dotfiles CLI was invoked. The Coder CLI itself uses exec.CommandContext() with an argument array and is not vulnerable; the injection occurred earlier, during shell expansion inside the module. As a result, a user who entered a crafted dotfiles_uri obtained arbitrary code execution in their workspace, even without mode=auto. Auto-creation amplification (mode=auto) The Create Workspace page supported a mode=auto query parameter that, combined with param.* URL parameters, automatically created a workspace on page load without displaying a confirmation prompt. An attacker could craft a malicious URL pointing to a victim's Coder deployment and set arbitrary template parameter values (for example, param.dotfiles_uri). When an authenticated user clicked the link, the workspace was created immediately with the attacker-supplied parameters, turning the command injection above into a one-click, no-consent attack. Example URL: https://<dep