Php dns txt record Processing Heap Buffer Overflow Vulnerability (CVE-2014-3597)
Release date:Updated on:
Affected Systems:PHPUnaffected system:PHP 5.xDescription:--------------------------------------------------------------------------------Bugtraq id: 69322CVE (CAN) ID: CVE-2014-3597
PHP is a widely used scripting language. It is especially suitable for Web de
-mail system sends the message. For example, when a user on the internet wants to send a letter to user@mydomain.com, the user's mail system finds an MX record of the domain name mydomain.com through DNS, and if the MX record exists, The user's computer sends the message to the mail server specified by the MX
A record
Quote:The A (Address) record is used to specify the IP address record corresponding to the Host Name (or domain name. You can direct the website server under this domain name to your web server. You can also set a subdomain name for your domain name. In general, a record is the IP address of the server, and
DNS Services : is the domain name resolution, such as itbdw.tk is only a domain name, the actual access to the IP address, we enter the domain name, and then through the DNS server resolution to the corresponding IP, you can visit the site.
a record : Each host on the Internet has an IP address and has 4 sets of numbers. These numbers are used. Separate, for
Each entry in a database is called a resource record (RR)
Resource record format:
The second field in the first section, the third field, the fourth field (resource record type), and the fifth field
Name TTL in (Internet) rrtvalue
If TTL is not written, you must specify a default value in the global variable. The TTL value can be omitted.
TTL 600;
For
the meaning of reading SPF record values
Results
Meaning
Server Processing methods
pass The sender IP is legal
accept Letters
fail
back letter
soft Fail
accept letters, but Mark
neutral SPF record does not have information about whether the sender IP is legitimate
About the dns resolution and mx record of the email server!
How do I make MX resolution records for domain names? --------------------------------------------------------------------------------Most SMTP requests an MX record to point to a host name. Therefore, specify an MX
-authoritative" response is replicated from other DNS servers, corresponding to the "authoritative" answer, which is the answer from the server where the domain name is located, sounds difficult to understand, let's take a look at an example.
I am located in Shenzhen, where the public DNS server is 202.96.134.133, we have to check.
The following figure:
Here t
The DNS record disappears! Don't be confused. It's not so terrible. The first thing you need to do is to find the invisible DNS records (as described above). Now you have calmed down, let's take a look at how to fix the DNS records that disappear!
Fix "corrupted" or wrong DNS
DNS service to fill in the record,1) About: servername in the configuration/etc/resolv.conf of the secondary DNS server points to itself.SlavesVim/etc/named.rfc1912.zones"Add changes to"Zone "Hxl.com" in {Type slave;Masters {172.25.254.206;};File "Slaves/hxl.com.zone";allow-update {none;};};Vim/etc/named.rfc1912.zones on the primary
localhost, which is to allow only native queries. Recursionyes;dnssec-enableyes;dnssec-validationyes;dnssec-lookasideauto;/*pathtoiscdlvkey*/bindkeys-file " /etc/named.iscdlv.key ";managed-keys-directory"/var/named/dynamic ";}; logging{channeldefault_debug{ file "Data/named.run" ; severity dynamic;};}; zone "." IN{typehint;file "named.ca";};/ /include "/etc/named/named.rfc1912.zones";include "/etc/named/named.mydomain.cn.zone"; //because this file is to be used, so specify to this file include
placed in the "delete objects" folder, as shown in 1. However, the deleted DNS object is stored in the database where other DNS records are stored. For example, in Figure 2, we can see the DNS record stored in the DC = DomainDNSZones library, but it also has the "delete obj
=" Wkiol1m8g3hz_nvyaaauy6nb98e649.png "/>DNS distributed features650) this.width=650; "src=" Https://s1.51cto.com/wyfs02/M02/06/B1/wKiom1m8hFugm-2WAAB00Pw_cHk501.png "title=" Qq20170916095350.png "alt=" Wkiom1m8hfugm-2waab00pw_chk501.png "/> Zone Resolution Library: Made up of a number of RRsRR: resource record type Resource Record details the relationship of a
Create a forward lookup zone ynkm.com and create a host record under this zone webserver,ynkm.com. Action steps are as follows:
① Open the (INSMGMT console window, select the DNS server for which you want to create a forward lookup zone, and then select the Action-New Zone command in the menu bar, as shown in Figure 1.)
② pops up the New Zone Wizard dialog box as shown in Figure 2, which guides the u
Previously thought is not set up, because in the self-service management system did not find the place.
Today to the million Network technology customer service call, just know, in fact, can be set. Login www.net.cn, in the left menu has a "domain DIY self-help management", click to enter the "domain name self-help resolution platform" (Http://diy.hichina.com/cgi-bin/login), Use domain name and domain name password (not million network account password OH) login, click on the left menu "
network or enter the address, you can find that we have been configured successfully, but the main page of the jump is Tomcat's homepage, this time we need to redirect the main page, whichTime We need to modify a configuration, the Server.xml file under the Tomcat installation path confAdd and modify the following:After configuring the Tomcat service to restart, the browser types the localhost effect:After the successful external network mapping, the detection effect:The difference between intr
III.Analysis of specific examples:The MATLAB website uses two examples to describe the basic usage of each command in great detail. In reality, how can we choose the appropriate command for the data on the opponent's head? The following is a summary based on several examples:
1. Pure data (with the same number of columns ):Source file:
Code:0 3866.162 2198.938 141.1401 3741.139 2208.475 141.25223866.200 2198.936 141.1563 3678.048 2199.191 141.2304 3685.453 2213.726141.2615 3728.769 2212.433 141
1.DNS Query process:
Take query www.baidu.com as an example
(1) The computer sends the request of parsing www.baidu.com to the local domain name server(2) The local domain name server receives the request, first inquires the local cache, if finds the direct return query result, if does not have this record, the local domain name server sends the www.baidu.com r
Article Title: DNS configuration example. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.
DNS Server configuration example:
Note: The above
1 Dnspython Processing module installation, source modewget http://www.dnspython.org/kits/1.9.4/dnspython-1.9.4.tar.gzTar zxf dnspython-1.9.4.tar.gzCD dnspython-1.9.4/Python setup.py Install2 parsing examplesA record query example#!/usr/bin/env python#-*-coding:utf-8-*-import dns.resolverdomain = raw_input ("Please enter a domain name to resolve:") A = Dns.resolver.query (Domain, ' A ') for I in A.response.
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