Detecting cron tasks run by another user
Clash Royale CLAN TAG#URR8PPP
I am currently working through the Nebula challenges on exploit-exercises.com, and one of the challenges relies on a script being run by cron.
This is run by another user (flag03) and the user I am logged in as (level03) doesn't have privileges to run crontab -u flag03 to view the job.
The hint clearly indicates the script is run by cron. Additionally, it is the only script in the /home/flag03 directory, so we would likely investigate further.
However, if this was the real world, I wouldn't know that this script was being run by cron.
Therefore the question is, how would I detect that the task was being run from the perspective of an unprivileged user?
I have tried the following:
while true; do ps au | grep <scriptname> | grep -v grep; done;
This allows me to see processes that run for a significant length of time, but not ones that exit almost immediately. It also presumes I know the name of the script.
The specific environment is Ubuntu. I can't use apt-get, but I have access to gcc.
Any ideas?
cron privileges
edited May 3 '18 at 18:50
José Castillo Lema
25119
asked Jun 6 '14 at 7:05
CybergibbonsCybergibbons
1362
add a comment |
I am currently working through the Nebula challenges on exploit-exercises.com, and one of the challenges relies on a script being run by cron.
This is run by another user (flag03) and the user I am logged in as (level03) doesn't have privileges to run crontab -u flag03 to view the job.
The hint clearly indicates the script is run by cron. Additionally, it is the only script in the /home/flag03 directory, so we would likely investigate further.
However, if this was the real world, I wouldn't know that this script was being run by cron.
Therefore the question is, how would I detect that the task was being run from the perspective of an unprivileged user?
I have tried the following:
while true; do ps au | grep <scriptname> | grep -v grep; done;
This allows me to see processes that run for a significant length of time, but not ones that exit almost immediately. It also presumes I know the name of the script.
The specific environment is Ubuntu. I can't use apt-get, but I have access to gcc.
Any ideas?
cron privileges
edited May 3 '18 at 18:50
José Castillo Lema
25119
asked Jun 6 '14 at 7:05
CybergibbonsCybergibbons
1362
1
Can you look at anything under/var/log/? Look for log messages about cron tasks.
– slm♦
Jun 6 '14 at 18:09
No, unfortunately no permissions or not relevant (grep -ri cron / or find / -name cron)
– Cybergibbons
Jun 6 '14 at 19:15
add a comment |
I am currently working through the Nebula challenges on exploit-exercises.com, and one of the challenges relies on a script being run by cron.
This is run by another user (flag03) and the user I am logged in as (level03) doesn't have privileges to run crontab -u flag03 to view the job.
The hint clearly indicates the script is run by cron. Additionally, it is the only script in the /home/flag03 directory, so we would likely investigate further.
However, if this was the real world, I wouldn't know that this script was being run by cron.
Therefore the question is, how would I detect that the task was being run from the perspective of an unprivileged user?
I have tried the following:
while true; do ps au | grep <scriptname> | grep -v grep; done;
This allows me to see processes that run for a significant length of time, but not ones that exit almost immediately. It also presumes I know the name of the script.
The specific environment is Ubuntu. I can't use apt-get, but I have access to gcc.
Any ideas?
cron privileges
edited May 3 '18 at 18:50
José Castillo Lema
25119
asked Jun 6 '14 at 7:05
CybergibbonsCybergibbons
1362
I am currently working through the Nebula challenges on exploit-exercises.com, and one of the challenges relies on a script being run by cron.
This is run by another user (flag03) and the user I am logged in as (level03) doesn't have privileges to run crontab -u flag03 to view the job.
The hint clearly indicates the script is run by cron. Additionally, it is the only script in the /home/flag03 directory, so we would likely investigate further.
However, if this was the real world, I wouldn't know that this script was being run by cron.
Therefore the question is, how would I detect that the task was being run from the perspective of an unprivileged user?
I have tried the following:
while true; do ps au | grep <scriptname> | grep -v grep; done;
This allows me to see processes that run for a significant length of time, but not ones that exit almost immediately. It also presumes I know the name of the script.
The specific environment is Ubuntu. I can't use apt-get, but I have access to gcc.
Any ideas?
cron privileges
cron privileges
edited May 3 '18 at 18:50
José Castillo Lema
25119
asked Jun 6 '14 at 7:05
CybergibbonsCybergibbons
1362
edited May 3 '18 at 18:50
José Castillo Lema
25119
asked Jun 6 '14 at 7:05
CybergibbonsCybergibbons
1362
edited May 3 '18 at 18:50
José Castillo Lema
25119
edited May 3 '18 at 18:50
José Castillo Lema
25119
edited May 3 '18 at 18:50
José Castillo Lema
25119
25119
asked Jun 6 '14 at 7:05
CybergibbonsCybergibbons
1362
asked Jun 6 '14 at 7:05
CybergibbonsCybergibbons
1362
asked Jun 6 '14 at 7:05
CybergibbonsCybergibbons
1362
1362
1
Can you look at anything under/var/log/? Look for log messages about cron tasks.
– slm♦
Jun 6 '14 at 18:09
No, unfortunately no permissions or not relevant (grep -ri cron / or find / -name cron)
– Cybergibbons
Jun 6 '14 at 19:15
add a comment |
1
Can you look at anything under/var/log/? Look for log messages about cron tasks.
– slm♦
Jun 6 '14 at 18:09
No, unfortunately no permissions or not relevant (grep -ri cron / or find / -name cron)
– Cybergibbons
Jun 6 '14 at 19:15
1
1
Can you look at anything under
/var/log/? Look for log messages about cron tasks.– slm♦
Jun 6 '14 at 18:09
Can you look at anything under
/var/log/? Look for log messages about cron tasks.– slm♦
Jun 6 '14 at 18:09
No, unfortunately no permissions or not relevant (grep -ri cron / or find / -name cron)
– Cybergibbons
Jun 6 '14 at 19:15
No, unfortunately no permissions or not relevant (grep -ri cron / or find / -name cron)
– Cybergibbons
Jun 6 '14 at 19:15
add a comment |
6 Answers
6
active
oldest
votes
Maybe using inotifywait in the /proc/[0-9]+ directories would let you have a better glimpse of short run processes.
answered Jun 7 '14 at 11:34
pirouxpiroux
1
add a comment |
Looking at the challenge this method of attack would assume that you can run a script and watch what runs on the box, so I would write a script that simply does a dump of ps -eaf every couple of seconds, this would catch a cron, eventually, since crons run once every minute.
This vector of attack would require you to watch for this script running, note the location of the script, and dig in deeper.
answered Jun 7 '14 at 12:31
slm♦slm
251k67529685
Isn't that pretty much the one-liner I posted in the question?
– Cybergibbons
Jun 9 '14 at 8:13
@Cybergibbons - more or less. I'd modify the script slightly and there are other ways to watch for processes running, so if this wasn't successful in finding any cronjobs, I might dig in deeper with those.
– slm♦
Jun 9 '14 at 11:58
add a comment |
In this specific case, the file is located on /var/spool/cron/crontabs/flag03, and you can read it with the nebula account.
But level03 doesn't have enough privileges to access it.
answered Mar 12 '15 at 15:59
thiagowfxthiagowfx
736413
add a comment |
Which version of Ubuntu? If it's using systemd, you could rely on the cron cgroup created by systemd I guess, as all processes started by cron will be a direct child.
One of the option to get this information is to use the ps command with something like:
ps -eo user,pid,cmd,unit | grep cron.service | grep flag03
edited Dec 11 '16 at 12:08
mazs
2,5921623
answered Dec 11 '16 at 11:35
BigonBigon
1,257713
Why does this not suffer from the same issue as the suggestion in the question i.e. short lived processes will be missed.
– Cybergibbons
Dec 20 '16 at 14:39
Indeed, but you could mix that with the idea from @piroux and add a inotify watch on the files in/sys/fs/cgroup/systemd/system.slice/cron.service/
– Bigon
Dec 20 '16 at 15:27
add a comment |
You can't. The closest you can get is:
inotifywait -m /home/flag03/script
That won't show execution but it will show when script is opened or accessed.
answered May 3 '18 at 23:53
Mark WagnerMark Wagner
1,35667
add a comment |
while true; do ps aux | egrep -v "grep|tail|aux" | tail -n 1; sleep 1; done
edited Dec 11 '16 at 20:36
slm♦
251k67529685
answered Dec 11 '16 at 5:44
RobRob
1
3
Give more info, it is a Q&A site and not a snippet sharing one.
– peterh
Dec 11 '16 at 7:52
add a comment |
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6 Answers
6
active
oldest
votes
6 Answers
6
active
oldest
votes
active
oldest
votes
active
oldest
votes
Maybe using inotifywait in the /proc/[0-9]+ directories would let you have a better glimpse of short run processes.
answered Jun 7 '14 at 11:34
pirouxpiroux
1
add a comment |
Maybe using inotifywait in the /proc/[0-9]+ directories would let you have a better glimpse of short run processes.
answered Jun 7 '14 at 11:34
pirouxpiroux
1
add a comment |
Maybe using inotifywait in the /proc/[0-9]+ directories would let you have a better glimpse of short run processes.
answered Jun 7 '14 at 11:34
pirouxpiroux
1
Maybe using inotifywait in the /proc/[0-9]+ directories would let you have a better glimpse of short run processes.
answered Jun 7 '14 at 11:34
pirouxpiroux
1
answered Jun 7 '14 at 11:34
pirouxpiroux
1
answered Jun 7 '14 at 11:34
pirouxpiroux
1
answered Jun 7 '14 at 11:34
pirouxpiroux
1
1
add a comment |
add a comment |
Looking at the challenge this method of attack would assume that you can run a script and watch what runs on the box, so I would write a script that simply does a dump of ps -eaf every couple of seconds, this would catch a cron, eventually, since crons run once every minute.
This vector of attack would require you to watch for this script running, note the location of the script, and dig in deeper.
answered Jun 7 '14 at 12:31
slm♦slm
251k67529685
Isn't that pretty much the one-liner I posted in the question?
– Cybergibbons
Jun 9 '14 at 8:13
@Cybergibbons - more or less. I'd modify the script slightly and there are other ways to watch for processes running, so if this wasn't successful in finding any cronjobs, I might dig in deeper with those.
– slm♦
Jun 9 '14 at 11:58
add a comment |
Looking at the challenge this method of attack would assume that you can run a script and watch what runs on the box, so I would write a script that simply does a dump of ps -eaf every couple of seconds, this would catch a cron, eventually, since crons run once every minute.
This vector of attack would require you to watch for this script running, note the location of the script, and dig in deeper.
answered Jun 7 '14 at 12:31
slm♦slm
251k67529685
Isn't that pretty much the one-liner I posted in the question?
– Cybergibbons
Jun 9 '14 at 8:13
@Cybergibbons - more or less. I'd modify the script slightly and there are other ways to watch for processes running, so if this wasn't successful in finding any cronjobs, I might dig in deeper with those.
– slm♦
Jun 9 '14 at 11:58
add a comment |
Looking at the challenge this method of attack would assume that you can run a script and watch what runs on the box, so I would write a script that simply does a dump of ps -eaf every couple of seconds, this would catch a cron, eventually, since crons run once every minute.
This vector of attack would require you to watch for this script running, note the location of the script, and dig in deeper.
answered Jun 7 '14 at 12:31
slm♦slm
251k67529685
Looking at the challenge this method of attack would assume that you can run a script and watch what runs on the box, so I would write a script that simply does a dump of ps -eaf every couple of seconds, this would catch a cron, eventually, since crons run once every minute.
This vector of attack would require you to watch for this script running, note the location of the script, and dig in deeper.
answered Jun 7 '14 at 12:31
slm♦slm
251k67529685
answered Jun 7 '14 at 12:31
slm♦slm
251k67529685
answered Jun 7 '14 at 12:31
slm♦slm
251k67529685
answered Jun 7 '14 at 12:31
slm♦slm
251k67529685
251k67529685
Isn't that pretty much the one-liner I posted in the question?
– Cybergibbons
Jun 9 '14 at 8:13
@Cybergibbons - more or less. I'd modify the script slightly and there are other ways to watch for processes running, so if this wasn't successful in finding any cronjobs, I might dig in deeper with those.
– slm♦
Jun 9 '14 at 11:58
add a comment |
Isn't that pretty much the one-liner I posted in the question?
– Cybergibbons
Jun 9 '14 at 8:13
@Cybergibbons - more or less. I'd modify the script slightly and there are other ways to watch for processes running, so if this wasn't successful in finding any cronjobs, I might dig in deeper with those.
– slm♦
Jun 9 '14 at 11:58
Isn't that pretty much the one-liner I posted in the question?
– Cybergibbons
Jun 9 '14 at 8:13
Isn't that pretty much the one-liner I posted in the question?
– Cybergibbons
Jun 9 '14 at 8:13
@Cybergibbons - more or less. I'd modify the script slightly and there are other ways to watch for processes running, so if this wasn't successful in finding any cronjobs, I might dig in deeper with those.
– slm♦
Jun 9 '14 at 11:58
@Cybergibbons - more or less. I'd modify the script slightly and there are other ways to watch for processes running, so if this wasn't successful in finding any cronjobs, I might dig in deeper with those.
– slm♦
Jun 9 '14 at 11:58
add a comment |
In this specific case, the file is located on /var/spool/cron/crontabs/flag03, and you can read it with the nebula account.
But level03 doesn't have enough privileges to access it.
answered Mar 12 '15 at 15:59
thiagowfxthiagowfx
736413
add a comment |
In this specific case, the file is located on /var/spool/cron/crontabs/flag03, and you can read it with the nebula account.
But level03 doesn't have enough privileges to access it.
answered Mar 12 '15 at 15:59
thiagowfxthiagowfx
736413
add a comment |
In this specific case, the file is located on /var/spool/cron/crontabs/flag03, and you can read it with the nebula account.
But level03 doesn't have enough privileges to access it.
answered Mar 12 '15 at 15:59
thiagowfxthiagowfx
736413
In this specific case, the file is located on /var/spool/cron/crontabs/flag03, and you can read it with the nebula account.
But level03 doesn't have enough privileges to access it.
answered Mar 12 '15 at 15:59
thiagowfxthiagowfx
736413
answered Mar 12 '15 at 15:59
thiagowfxthiagowfx
736413
answered Mar 12 '15 at 15:59
thiagowfxthiagowfx
736413
answered Mar 12 '15 at 15:59
thiagowfxthiagowfx
736413
736413
add a comment |
add a comment |
Which version of Ubuntu? If it's using systemd, you could rely on the cron cgroup created by systemd I guess, as all processes started by cron will be a direct child.
One of the option to get this information is to use the ps command with something like:
ps -eo user,pid,cmd,unit | grep cron.service | grep flag03
edited Dec 11 '16 at 12:08
mazs
2,5921623
answered Dec 11 '16 at 11:35
BigonBigon
1,257713
Why does this not suffer from the same issue as the suggestion in the question i.e. short lived processes will be missed.
– Cybergibbons
Dec 20 '16 at 14:39
Indeed, but you could mix that with the idea from @piroux and add a inotify watch on the files in/sys/fs/cgroup/systemd/system.slice/cron.service/
– Bigon
Dec 20 '16 at 15:27
add a comment |
Which version of Ubuntu? If it's using systemd, you could rely on the cron cgroup created by systemd I guess, as all processes started by cron will be a direct child.
One of the option to get this information is to use the ps command with something like:
ps -eo user,pid,cmd,unit | grep cron.service | grep flag03
edited Dec 11 '16 at 12:08
mazs
2,5921623
answered Dec 11 '16 at 11:35
BigonBigon
1,257713
Why does this not suffer from the same issue as the suggestion in the question i.e. short lived processes will be missed.
– Cybergibbons
Dec 20 '16 at 14:39
Indeed, but you could mix that with the idea from @piroux and add a inotify watch on the files in/sys/fs/cgroup/systemd/system.slice/cron.service/
– Bigon
Dec 20 '16 at 15:27
add a comment |
Which version of Ubuntu? If it's using systemd, you could rely on the cron cgroup created by systemd I guess, as all processes started by cron will be a direct child.
One of the option to get this information is to use the ps command with something like:
ps -eo user,pid,cmd,unit | grep cron.service | grep flag03
edited Dec 11 '16 at 12:08
mazs
2,5921623
answered Dec 11 '16 at 11:35
BigonBigon
1,257713
Which version of Ubuntu? If it's using systemd, you could rely on the cron cgroup created by systemd I guess, as all processes started by cron will be a direct child.
One of the option to get this information is to use the ps command with something like:
ps -eo user,pid,cmd,unit | grep cron.service | grep flag03
edited Dec 11 '16 at 12:08
mazs
2,5921623
answered Dec 11 '16 at 11:35
BigonBigon
1,257713
edited Dec 11 '16 at 12:08
mazs
2,5921623
edited Dec 11 '16 at 12:08
mazs
2,5921623
edited Dec 11 '16 at 12:08
mazs
2,5921623
2,5921623
answered Dec 11 '16 at 11:35
BigonBigon
1,257713
answered Dec 11 '16 at 11:35
BigonBigon
1,257713
answered Dec 11 '16 at 11:35
BigonBigon
1,257713
1,257713
Why does this not suffer from the same issue as the suggestion in the question i.e. short lived processes will be missed.
– Cybergibbons
Dec 20 '16 at 14:39
Indeed, but you could mix that with the idea from @piroux and add a inotify watch on the files in/sys/fs/cgroup/systemd/system.slice/cron.service/
– Bigon
Dec 20 '16 at 15:27
add a comment |
Why does this not suffer from the same issue as the suggestion in the question i.e. short lived processes will be missed.
– Cybergibbons
Dec 20 '16 at 14:39
Indeed, but you could mix that with the idea from @piroux and add a inotify watch on the files in/sys/fs/cgroup/systemd/system.slice/cron.service/
– Bigon
Dec 20 '16 at 15:27
Why does this not suffer from the same issue as the suggestion in the question i.e. short lived processes will be missed.
– Cybergibbons
Dec 20 '16 at 14:39
Why does this not suffer from the same issue as the suggestion in the question i.e. short lived processes will be missed.
– Cybergibbons
Dec 20 '16 at 14:39
Indeed, but you could mix that with the idea from @piroux and add a inotify watch on the files in
/sys/fs/cgroup/systemd/system.slice/cron.service/– Bigon
Dec 20 '16 at 15:27
Indeed, but you could mix that with the idea from @piroux and add a inotify watch on the files in
/sys/fs/cgroup/systemd/system.slice/cron.service/– Bigon
Dec 20 '16 at 15:27
add a comment |
You can't. The closest you can get is:
inotifywait -m /home/flag03/script
That won't show execution but it will show when script is opened or accessed.
answered May 3 '18 at 23:53
Mark WagnerMark Wagner
1,35667
add a comment |
You can't. The closest you can get is:
inotifywait -m /home/flag03/script
That won't show execution but it will show when script is opened or accessed.
answered May 3 '18 at 23:53
Mark WagnerMark Wagner
1,35667
add a comment |
You can't. The closest you can get is:
inotifywait -m /home/flag03/script
That won't show execution but it will show when script is opened or accessed.
answered May 3 '18 at 23:53
Mark WagnerMark Wagner
1,35667
You can't. The closest you can get is:
inotifywait -m /home/flag03/script
That won't show execution but it will show when script is opened or accessed.
answered May 3 '18 at 23:53
Mark WagnerMark Wagner
1,35667
answered May 3 '18 at 23:53
Mark WagnerMark Wagner
1,35667
answered May 3 '18 at 23:53
Mark WagnerMark Wagner
1,35667
answered May 3 '18 at 23:53
Mark WagnerMark Wagner
1,35667
1,35667
add a comment |
add a comment |
while true; do ps aux | egrep -v "grep|tail|aux" | tail -n 1; sleep 1; done
edited Dec 11 '16 at 20:36
slm♦
251k67529685
answered Dec 11 '16 at 5:44
RobRob
1
3
Give more info, it is a Q&A site and not a snippet sharing one.
– peterh
Dec 11 '16 at 7:52
add a comment |
while true; do ps aux | egrep -v "grep|tail|aux" | tail -n 1; sleep 1; done
edited Dec 11 '16 at 20:36
slm♦
251k67529685
answered Dec 11 '16 at 5:44
RobRob
1
3
Give more info, it is a Q&A site and not a snippet sharing one.
– peterh
Dec 11 '16 at 7:52
add a comment |
while true; do ps aux | egrep -v "grep|tail|aux" | tail -n 1; sleep 1; done
edited Dec 11 '16 at 20:36
slm♦
251k67529685
answered Dec 11 '16 at 5:44
RobRob
1
while true; do ps aux | egrep -v "grep|tail|aux" | tail -n 1; sleep 1; done
edited Dec 11 '16 at 20:36
slm♦
251k67529685
answered Dec 11 '16 at 5:44
RobRob
1
edited Dec 11 '16 at 20:36
slm♦
251k67529685
edited Dec 11 '16 at 20:36
slm♦
251k67529685
edited Dec 11 '16 at 20:36
slm♦
251k67529685
251k67529685
answered Dec 11 '16 at 5:44
RobRob
1
answered Dec 11 '16 at 5:44
RobRob
1
answered Dec 11 '16 at 5:44
RobRob
1
1
3
Give more info, it is a Q&A site and not a snippet sharing one.
– peterh
Dec 11 '16 at 7:52
add a comment |
3
Give more info, it is a Q&A site and not a snippet sharing one.
– peterh
Dec 11 '16 at 7:52
3
3
Give more info, it is a Q&A site and not a snippet sharing one.
– peterh
Dec 11 '16 at 7:52
Give more info, it is a Q&A site and not a snippet sharing one.
– peterh
Dec 11 '16 at 7:52
add a comment |
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Can you look at anything under
/var/log/? Look for log messages about cron tasks.– slm♦
Jun 6 '14 at 18:09
No, unfortunately no permissions or not relevant (grep -ri cron / or find / -name cron)
– Cybergibbons
Jun 6 '14 at 19:15