- #Stack smashing detected stratum terminated code#
- #Stack smashing detected stratum terminated Offline#
It is notably used to keep track of the return point (the return address) after running a subroutine plus, the data used locally by a function is usually written on the stack.
![stack smashing detected stratum terminated stack smashing detected stratum terminated](https://signalsandthreads.com/static/images/header-mobile.jpg)
The stack is a part of a program's memory (another well known part is the heap).
#Stack smashing detected stratum terminated code#
In particular, *** stack smashing detected *** is printed *after* printing the robot so some code is still executed before crashing. Interesting! we managed to make the program crash, and with a verbose error. Welcome to the rise of the machines aaaaaa. We try to input a long string of chars: 1Īaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaībbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb (side note: by running the remote program, we learn the length of the real flag it's too long to be bruteforced, of course). So there is a function that reads the flag, but instead of simply displaying, this function replaces the chars by * beforehand. Locally, we create this file with dummy contents, but on the server it contains what we want. This program reads a file flag.txt which looks darn promising. \babyfirst, hoping for some low-hanging fruits, but without success. I hope we won't have to understand the source from those instructions only. 1īabyfirst: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, \
![stack smashing detected stratum terminated stack smashing detected stratum terminated](https://user-images.githubusercontent.com/33536490/32642452-f9ce8ab0-c606-11e7-9254-23cea4341917.png)
#Stack smashing detected stratum terminated Offline#
The latter indicates that we will probably need to do something with that binary, as opposed to directly trying injections on the remote instance plus, it is natural to start by analyzing the offline material we are given. You start with two things: a network address where a program runs (you can connect via ssh and interact with it), and the binary of that program, babyfirst. Google is turning up nothing useful for why crond is encountering this problem.Scenario. I've tried reinstalling cronie (hence the "Reloading" stuff up above), but the problem clearly persists. It seems like the problem began on the day that anacron stopped working, so my best guess is that since cronie uses cron to run anacron, this stack smashing issue is what's preventing anacron from running on schedule. The "stack smashing problem" seemed promising, so I pulled upĪpr 22 13:01:01 localhost CROND: (root) CMD (run-parts /etc/cron.hourly)Īpr 22 14:01:01 localhost CROND: (root) CMD (run-parts /etc/cron.hourly)Īpr 22 15:01:01 localhost CROND: (root) CMD (run-parts /etc/cron.hourly)Īpr 22 16:01:01 localhost CROND: (root) CMD (run-parts /etc/cron.hourly)Īpr 22 17:01:01 localhost crond: *** stack smashing detected ***: terminatedĪpr 22 18:01:01 localhost crond: *** stack smashing detected ***: terminatedĪpr 22 19:01:01 localhost crond: *** stack smashing detected ***: terminated Jun 18 12:01:01 localhost crond: *** stack smashing detected ***: terminated Jun 18 11:43:01 localhost crond: (root) CAN'T OPEN (/etc/crontab): No such file or directory Jun 18 11:42:01 localhost crond: (root) CAN'T OPEN (/etc/crontab): No such file or directory
![stack smashing detected stratum terminated stack smashing detected stratum terminated](https://i.imgur.com/ebJ51xG.png)
Jun 18 11:01:01 localhost crond: *** stack smashing detected ***: terminated
![stack smashing detected stratum terminated stack smashing detected stratum terminated](https://www.educative.io/static/imgs/logos/EdpressoLogo2.png)
Jun 18 10:42:01 localhost crond: (root) CAN'T OPEN (/etc/crontab): No such file or directory Jun 18 10:41:01 localhost crond: (CRON) INFO (running with inotify support) Jun 18 10:40:46 localhost systemd: Reloaded Periodic Command Scheduler. Jun 18 10:40:46 localhost systemd: Reloading Periodic Command Scheduler. Jun 18 10:01:01 localhost crond: *** stack smashing detected ***: terminated Jun 18 09:01:01 localhost crond: *** stack smashing detected ***: terminated Loaded: loaded (/usr/lib/systemd/system/rvice disabled vendor preset: disabled)Īctive: active (running) since Thu 09:56:25 MST 3 months 18 days ago