debsecan: add page (#6567)

pages/linux/debsecan.md

@@ -0,0 +1,24 @@
+# debsecan
+
+> Debian Security Analyzer, a tool to list vulnerabilities on a particular Debian installation.
+> More information: <https://gitlab.com/fweimer/debsecan>.
+
+- List vulnerable installed packages on the current host:
+
+`debsecan`
+
+- List vulnerable installed packages of a specific suite:
+
+`debsecan --suite {{release_code_name}}`
+
+- List only fixed vulnerabilities:
+
+`debsecan --suite {{release_code_name}} --only-fixed`
+
+- List only fixed vulnerabilities of unstable ("sid") and mail to root:
+
+`debsecan --suite {{sid}} --only-fixed --format {{report}} --mailto {{root}} --update-history`
+
+- Upgrade vulnerable installed packages:
+
+`sudo apt upgrade $(debsecan --only-fixed --format {{packages}})`