s2 mobile

The Struts S2-020 announcement has been published for some time. We all know that this vulnerability can cause DOS, file download, and other dangers. We believe that major vendors have also taken corresponding security measures. Today, I would like to share with you some research on this vulnerability, including how to cause RCE in Tomcat 8. The purpose is to introduce some of the shortcomings. 1. attribute listOne difficulty of this vulnerability ana

Struts2 has the remote code execution vulnerability again. For details, see 《Struts2 Remote Code Execution Vulnerability Analysis (S2-013)"The following is a temporary solution provided by the LH Team:Modify the file: org. apache. struts2.views. util. DefaultUrlHelper lines 281-284: Private String translateVariable (String input ){ ValueStack valueStack = ServletActionContext. getContext (). getValueStack (); Return TextParseUtil. translateVariable

Struts2 as a widely used web framework, security issues continue to emerge. In order to ensure security, in the business process should not trust the user to submit any data, do a good job of security filtering. It is best to add a filter blacklist to the OGNL execution portal and update struts to 2.3.25 (not released) in a timely manner.STRUTS2 official website released the latest 2.5beta, unable to download to 2.3.25. Maven cannot find resources, but it can be https://repository.apache.org/con

interface through extends, the class implements the interface through implements, and C # uses the colon ":" to implement these two functions. member variables (attributes) in the Java interface are constants that are automatically modified with public static final, and theC # interface does not allow member variables, but can have properties. the properties and methods in the Java interface can be decorated with public , which is public by default in C # , but does not allow the display to us

object as follows. (File) InputStream in=new FileInputStream ("C:\\Test.txt");3. Use fileinputstream to read the text file using the following steps. (1) introduce the relevant classes. Import java.io.IOException;Import Java.io.InputStream;Import Java.io.FileInputStream;(2) Create a file input stream object. InputStream fileobject=new FileInputStream ("C:\\Test.txt");(3) Use the file input stream method to read the text file data. Fileobejct.available (); number of bytes that can be readFileobj

of the Entity class:1, the attributes of the entity class are generally decorated with private . 2, according to business needs and packaging requirements for the attributes of the entity class to provide a getter/setter method, responsible for reading and assigning properties, general use of public decoration. 3, the entity class to provide a non-parametric construction method, according to business needs to provide a corresponding parameter construction method. 4, entity class best implement

CPU only know 0 and 1, so we need to compile the source file into a middleFile, named MSIL (Microsoft intermediate code). Then the middle code, the CPU still does not know, need to go through a special component of the CLR, is JIT (JustIn time compiler) to translate, translated into the CPU can read 0 and 1, if the bottom said, 0 and 1 in the computer corresponding to the high and low potential.The high potential is represented by 1, and the low potential is represented by 0.10. Class Diagram:1

prevents type names from conflicting. Library developers should use the following guidelines when creating names for namespaces: "Company name. Technical name" For example, the Microsoft.word namespace conforms to this principle. Using a naming scheme to group related types into namespaces is a very useful way to generate and record class libraries. However, this naming scheme is not valid for visibility, member access, inheritance, security, or binding. A namespace can be divided into multiple

Catalog 1. Description 2. Effected Scope 3. Exploit Analysis 4. Principle of vulnerability 5. Patch Fix 1. Description Dynamic method Invocation are a mechanism known to impose possible security vulnerabilities, but until now it is enabled B Y default with warning so users should switch it off if possible. Relevant Link: Http://struts.apache.org/docs/s2-019.html?spm=5176.775974950.2.8.iJuruO 2. Effected Scope3. Exploit analysis 0x1:poc Require targ

exception(Unable to represent certain information)4Delete exception(Loss of useful information)Three normative theories of database designOneThe objective of the first paradigm is to ensure thatThe atomicity of each columnTwoThe objective of the second paradigm is to ensure thatEach column in the table is associated with the primary keyThreeThe objective of the third paradigm is to ensure thatEach column is directly related to the primary key,Rather than indirectly related(Cannot pass dependent

interface contains a number of basic database operations methods, the following 3 methods for executing SQL commands . ResultSet executeQuery (String sql): You can execute a SQL query and get the ResultSet object. int executeupdate (String sql): You can perform an INSERT, delete, update operation. The return value is the number of rows affected by performing the operation. Boolean execute (String sql): you can execute any SQL statement that returns true if the result is a ResultSet object, or

The handwriting input method is a feature provided by Samsung tablet. We only need to switch the input method on the information filling interface. The details are as follows.1. Click [application] on the mobile phone interface. The result is as follows:2. Then we can find the [Settings] option. The effect is as follows.3. Then find the language and input here. The result is as follows.4. Click [Samsung Chinese input method ].5. Click [Chinese ].6. Se

It took two days to record one: background:Apache Strust2 released its latest security bulletin on August 22, 2018, and Apache Struts2 has a high-risk vulnerability to remote code execution.Second: The vulnerability of the creation principle:1. Need to know the action name of the corresponding jump requestThe properties in the 2.struts2 frame are set to:1) Struts.mapper.alwaysSelectFullNamespace = True2) type = "Redirectaction" or type = "Chain"Third: Malicious code to run the process:1. Struts2

Catalog1 . Description2. Effected Scope3. ExploitAnalysis4. Principle of Vulnerability5. Patch Fix1. DescriptionOGNL provides, among other features, extensive expression evaluation capabilities.A request that included a specially crafted request parameter could is used to inject arbitrary OGNL code in a property, Afterward used as request parameter of a redirect address, which would cause a further evaluation.OGNL evaluation was already addressed in s2