Sql Server Express Limit Hack
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SQL Server Express, which you can download from this link, -us/sql-server/sql-server-editions-express is ascaled down edition of SQL Server. Its origins go back to the years of SQLServer 7 and SQL Server 2000, but in those days SQL Server Express was called MSDE(Microsoft SQL Server Data Engine). As a side note, some people say MSDE standsfor Microsoft Desktop Engine, but in my opinion, they are wrong because MSDE is anapplication intended for data management which has nothing to do with the WindowsDesktop.
2. Vulnerability scanning Vulnerability scanning often reveals weaknesses in the underlying OS, the Web application or the database system itself. Anything from missing SQL Server patches to Internet Information Services (IIS) configuration weaknesses to SNMP exploits can be uncovered by attackers and lead to database server compromise. The bad guys may use open source, home-grown or commercial tools. Some are even savvy enough to carry out their hacks manually from a command prompt. In the interest of time (and minimal wheel spinning), I recommend using commercial vulnerability assessment tools like QualysGuard from Qualys Inc. (for general scanning), WebInspect from SPI Dynamics (for Web application scanning) and Next Generation Security Software Ltd.'s NGSSquirrel for SQL Server (for database-specific scanning). They're easy to use, offer the most comprehensive assessment and, in turn, provide the best results. Figure 1 shows some SQL injection vulnerabilities you may be able to uncover.
9. Google hacks Google hacks use the extraordinary power of the Google search engine to ferret out SQL Server errors -- such as "Incorrect syntax near" -- leaking from publicly accessible systems. Several Google queries are available at Johnny Long's Google Hacking Database. (Look in the sections titled Error Messages and Files containing passwords.) Hackers use Google to find passwords, vulnerabilities in Web servers, underlying operating systems, publicly available procedures and more that they can use to further compromise a SQL Server system. Combining these queries with Web site names via Google's 'site:' operator often turns up juicy info you never imagined you could unearth.
Also, if a user tries to access a page on a website too often, the server of that website could trigger a rate-limiting feature implemented in it. So, this is a good security measure to put in place in order to prevent attacks from hackers.
The leaky bucket algorithm keeps a finite number of requests for a given user in a queue manner and execute them at a constant rate. It uses queue to enforce the limit based on the queue size in a first-in first-out (FIFO) approach. Requests are taken out of the queue and processed at a constant rate. If the requests exceed the queue size, those incoming requests will be dropped until the requests in the bucket are process. It works at a constant rate no matter the amount of traffic that a server receives.For instance, if the limit is 5 requests per minute, then the queue would only be able to hold 5 requests per time.For an in-depth discussion on all the techniques, checkout the links below
To implement rate limiting on a node js express js server, we will make use of a third-party library known as express-rate-limit which has done most of the heavy lifting for us. Express-rate-limit is a basic rate-limiting middleware for Express. It limits repeated requests to public APIs and/or endpoints such as authentication routes.
1. Using globally across all routesIf you want to use it globally, open your main server file where you have configured your express app and import the loginRateLimiter middleware function from middleware as shown below;
For the client-side implementation with react js where I have developed a login form and limit access to 5 requests per 15 min window size, you can get the repo here; Get the whole repo both client & server on Gthub repo
In this case, the issue may stem from your CDN's servers or some other restriction set by your hosting provider. First, reach out to your hosting support, detailing the problem and the steps you've taken so far to resolve it. It may be that you've exceeded your plan's file size limit without realizing. Or, your configurations may have inadvertently caused another error.
From what I have come across on the web, Window Authentication is preferred for security purposes. SQL Authentication appears to be easier to hack into since once you locate the server you can start trying to guess passwords.
In this information age, the data server has become the heart of acompany. This one piece of software controls the rhythm of most organizationsand is used to pump information lifeblood through the arteries of the network.Because of the critical nature of this application, the data server is also theone of the most popular targets for hackers. If a hacker owns this application,he can cause the company's "heart" to suffer a fatal arrest.
Ironically, although most users are now aware of hackers, they still do notrealize how susceptible their database servers are to hack attacks. Thus, thisarticle presents a description of the primary methods of attacking databaseservers (also known as SQL servers) and shows you how to protect yourselffrom these attacks.
All the connection information is important, but by far the weakest link isthe authentication information—or lack thereof. In a properly managedserver, each database has its own users with specifically designated permissionsthat control what type of activity they can perform. For example, a user accountwould be set up as read only for applications that need to only accessinformation. Another account should be used for inserts or updates, and maybeeven a third account would be used for deletes. This type of account controlensures that any compromised account is limited in functionality. Unfortunately,many database programs are set up with null or easy passwords, which leads tosuccessful hack attacks.
To prevent this, we can reduce the number of times a certain user can try to log in (using rate-limiter); we can lock the account of the user after several tries (using modules like Mongoose); we can gradually increase the response time for every login request from a certain user (using express-bouncer); we can also use CAPTCHAs to stop these attacks (using svg-captcha); we can potentially use hydra, a proof-of-concept tool to test how our application behaves in these scenarios.
As the name suggests, server security concerns the security of the server. It mainly focuses on the protection of data and resources held on the servers. It comprises tools and techniques that help prevent intrusions, hacking, and other malicious actions.
Buffering and parsing of request bodies can be a resource intensive task. If there is no limit on the size of requests, attackers can send requests with large request bodies that can exhaust server memory and/or fill disk space. You can limit the request body size for all requests using raw-body.
However, fixing a request size limit for all requests may not be the correct behavior, since some requests may have a large payload in the request body, such as when uploading a file. Also, input with a JSON type is more dangerous than a multipart input, since parsing JSON is a blocking operation. Therefore, you should set request size limits for different content types. You can accomplish this very easily with express middleware as follows:
Brute-forcing is a common threat to all web applications. Attackers can use brute-forcing as a password guessing attack to obtain account passwords. Therefore, application developers should take precautions against brute-force attacks especially in login pages. Node.js has several modules available for this purpose. Express-bouncer, express-brute and rate-limiter are just some examples. Based on your needs and requirements, you should choose one or more of these modules and use accordingly. Express-bouncer and express-brute modules work very similar and they both increase the delay with each failed request. They can both be arranged for a specific route. These modules can be used as follows:
Apart from express-bouncer and express-brute, the rate-limiter module can also help to prevent brute-forcing attacks. It enables specifying how many requests a specific IP address can make during a specified time period. 2b1af7f3a8