documentclass{book}
usepackage[utf8]{inputenc}
usepackage[T1]{fontenc}
usepackage[svgnames]{xcolor}

usepackage{lipsum}

usepackage[explicit]{titlesec}

newcommand{crulefill}{leavevmodeleadershrule height 0.7ex depthdimexpr 0.5pt-0.7exhfillkern 0pt}

titleformat{section}{bfseriesLarge} {fboxrule=0.5ptfcolorbox{black}{white!0}{{color{black}thesection.}}rule[.7ex]{10pt}{.5pt} } {0pt} {upshapebfseriesLarge#1  crulefill}%

titleformat{subsection}{bfserieslarge} {thesubsection.enspacecolor{LightSteelBlue}vrulecolor{black}}{0.6em} {#1}

begin{document}
setcounter{chapter}{1}
section{Sección}

subsection{Subsection}
lipsum[11]
section{Sección}
lipsum[12]
subsection{Subsection}
lipsum[13]

end{document}