The talkd security hole can ealso be exploited by wall (and thus rwall).

write and talk are not affected.
Now print out escape sequences in the same way as is done by write(1).

usr.bin/wall/wall.c

@@ -178,6 +178,11 @@ makemsg(fname)
 				putc('\r', fp);
 				putc('\n', fp);
 				cnt = 0;
+			} else if (!isprint(ch) && !isspace(ch) && ch != '\007')
+ {
+				putc('^', fp);
+				putc(ch^0x40, fp);	/* DEL to ?, others to a
+lpha */
 			} else
 				putc(ch, fp);
 		}