> Most web apps are built in languages that don't have buffer overrun problems.
The author is using "buffer" in a different sense than you are. You're thinking of a malloc'd buffer. The author is using "buffer" more abstractly, to refer to a data segment, such as a JSON or HTML string, or a string of encoded form data. His point is that that latter type of "buffer" has no declared length, and needs to be parsed in order to determine where it ends, and that as a result it is subject to problems that one can term "buffer overrun" by analogy with the traditional C scenario in which one obtains a pointer to some memory that you should not have access to.
The author is using "buffer" in a different sense than you are. You're thinking of a malloc'd buffer. The author is using "buffer" more abstractly, to refer to a data segment, such as a JSON or HTML string, or a string of encoded form data. His point is that that latter type of "buffer" has no declared length, and needs to be parsed in order to determine where it ends, and that as a result it is subject to problems that one can term "buffer overrun" by analogy with the traditional C scenario in which one obtains a pointer to some memory that you should not have access to.