Description of problem: The MMAP feature of lrzsz does not verify the boundary of a reposition request. In most cases, this is likely to just cause a segfault. This could also probably be used to intentionally read any memory available to the remote process. This could be a security bug, depending on how it is being used. Fortunately, the receive code does not use mmap, so it can't be used to overwrite executable code in the remote process. I reported this a long time ago, but it ended up getting lost in an old-bug cleanup. Version-Release number of selected component (if applicable): lrzsz-0.12.20-21.2.1 How reproducible: Always Steps to Reproduce: Difficult to reproduce. I discovered it from using buggy zmodem software with a bug, that sent a bogus reposition request when an error occurs. Actual results: Segfault. Expected results: An error message. Additional info: There are two places in lrz.c where fseek() can result in error messages. These places have no corresponding check for the mmap position pointer. It is trivial to fix, but maybe easier to just build it without the MMAP feature. It might seem worth just dropping the package, but there are cases where it is still a valuable tool. We have some hardware that uses zmodem for firmware updates.
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