PHP Execute with > - Close

Question

i try to make this:

<?php
error_reporting(E_ALL);
echo "<HTML><BODY>";
exec("echo Hallo > /tmp/testtt.txt", $output, $retval);
echo "Rückgabe mit Status $retval und Ausgabe:\n<br/>";
foreach($output as &$s){
       echo $s."<br/>";
}
echo "</BODY></HTML>";
?>

i already tried system, passthru, exec, popen but, it never creates /tmp/testtt.txt Rights of /tmp:

drwxrwxrwt  10 root root 220K Mai  3 10:28 tmp

What is my mistake?

How did you check /tmp/testtt.txt ? Did you try to chmod after exec? — Itagaki Fumihiko, May 03 '22 at 08:42
ls /tmp/ --> no file there. i got Root acces to the webserver — Jan Lahr-Kuhnert, May 03 '22 at 08:45
Just to add, Your $output will not contain anything useful as there is no output from the exec command. — TimBrownlaw, May 03 '22 at 09:03
How about exec("echo Hallo > /tmp/testtt.txt ; chmod 777 /tmp/testtt.txt", $output, $retval); — Itagaki Fumihiko, May 03 '22 at 09:06
Its a case of it "works for me" but while I have my /tmp owner/group as root root, I could still create the file with my user setting it to owner/group for the file. I have added myself to the sudo group. I'll need to try a virgin system. — TimBrownlaw, May 03 '22 at 09:08
Nope, it does nothing. i already added www-data to the sudoers. I can login with www-data to a other account. but i can not do touch or > — Jan Lahr-Kuhnert, May 03 '22 at 09:14
i found it. 'df -H: ' --> '/dev/sdb7 853G 80M 810G 1% /tmp' if i create a new folder /ttt and write the files there it runs. — Jan Lahr-Kuhnert, May 03 '22 at 09:50

score 0 · Answer 1 · answered May 03 '22 at 08:51

0

Try this

exec('sh -c "echo Hallo > /tmp/testtt.txt"', $output, $retval);

answered May 03 '22 at 08:51

Itagaki Fumihiko

574
3
8

The same. returncode 0 and the shell runs, but it cant create the file – Jan Lahr-Kuhnert May 03 '22 at 08:59
Are you sure the file is not created. If you cd into your systems tmp folder using cd /tmp is it in that folder? Or use ls /tmp – TimBrownlaw May 03 '22 at 09:01
yes, i'm rot at the system. the file don't exists. if i create the file and make chmod 777, it don't write into it. – Jan Lahr-Kuhnert May 03 '22 at 09:11

score 0 · Answer 2 · answered May 03 '22 at 10:13

0

The Problem was the Sticky bit. /tmp/ has a Sticky bit - so there is a Problem with the PHP exec...

answered May 03 '22 at 10:13

Jan Lahr-Kuhnert

21
2

Your answer could be improved with additional supporting information. Please [edit] to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers [in the help center](/help/how-to-answer). – Community May 05 '22 at 13:02

PHP Execute with > - Close

2 Answers2