yohanmanuja

former bug bounty hunter ,web pentester

Claude Desktop extension dialog on macOS with a security prompt, highlighting sanitized AppleScript parameters and blocked shell operators

Claude Desktop Extensions Vulnerable to Command Injection

Researchers documented CVSS 8.9 command injection in three official Claude Desktop extensions Chrome, iMessage, and Apple Notes. Because those connectors built AppleScript commands with unescaped user input, prompt injection could pivot from web content to local shell execution on macOS. Anthropic patched the issues. This analysis explains the exploit chain, the fixes, and the validation steps security teams should run to keep MCP servers safe.

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Signed MSI delivers EndClient RAT while AutoIt loader runs in memory

EndClient RAT Targets NGOs via Signed MSI Installer

EndClient RAT arrives as a signed MSI named “StressClear.msi,” which abuses code-signing trust and SmartScreen gaps. The package decoys with a VeraPort component while an obfuscated AutoIt loader executes in memory, establishes the IoKlTr task, and opens a JSON-over-TCP C2. To reduce risk, restrict MSI installs, enforce SmartScreen blocking, instrument MSI→AutoIt lineage, and remove scheduled tasks used for persistence.

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