

Today’s websites have an extensive range of functions and business opportunities, as well as web security issues compared to their grandparents from the year 2000. Could we imagine doing our banking or registering for a doctor’s appointment through websites? Doubtful.
However, as in any situation, there is a flip side to the coin. As web technologies have evolved, malware has evolved as well. Today websites process a lot of sensitive user information – credit card numbers, insurance policy numbers, geolocation, and much more. The loss of such data can threaten a company’s reputation, cause lawsuits, and, in the end, substantial financial losses. This is the reason why web app security has become a critical aspect in the development communities.
You might have heard that to protect against web attacks, an application or website should be developed according to OWASP guidelines. Let’s find out what OWASP is.
OWASP (Open Web Application Security Project) is an online community that publishes articles on web development security and vast documentation, guidelines for development and testing during all SDLC phases, as well as various tools and technologies.
Following these guidelines has become synonymous with high-quality and secure code. It guarantees that the most common website security risks do not threaten your site.
Even the world’s most secure software can suffer cyber-attacks. However, according to OWASP, there are the top 10 web applications security vulnerabilities through which cyber criminals more often carry out their malicious activities.
An attacker injects invalid data into a web application to make it do something the application was not designed/programmed for. The most common type of this web application threat is code injection via an SQL query (SQL injection) that uses unreliable data. The main reason for this software security vulnerability is the lack of validation and cleanup of the data used by the web application. This means that this vulnerability is present in any type of technology.
Anything that accepts parameters as input could potentially be the target of a similar attack.
The ability to prevent code injection depends on the technology you use on your site. For example, if you use WordPress, you can minimize potential problems by limiting the number of installed plugins.
If you are in the development stage, it is always better to turn to highly qualified professionals. A team of top-talented developers will help form the security requirements, which will later be followed when writing the software.
This web security threat lies in that an attacker, using manual or automatic methods, can gain control over any account or, even worse, over the system. This is one of the most common types of website vulnerabilities. Authentication breaches are usually related to logical problems in the authentication mechanism, such as poor session management where usernames are enumerated. In this case, the attacker uses brute-force techniques to guess the system’s user data. This vulnerability’s second most common manifestation allows users to use username and password matching for site pages.
Common reasons for creating insecure code containing such vulnerabilities are usually:
To avoid problems related to incorrect authentication, make sure that developers are implementing best practices for site security and have sufficient time to properly test the code before deploying the application in a production environment.
The vulnerability of critical data is one of the most common vulnerabilities. It’s primarily about sensitive data, which requires special attention and protection. These web attacks usually target credit card numbers, medical information, personally identifiable information, etc.
Over the past few years, the disclosure of confidential data has become one of the most common web security threats worldwide. The lack of encryption of sensitive data is the main reason why these attacks still happen so often. Even encrypted data can be compromised because of:
The application automatically encrypts credit card numbers in the database. However, when received, this data is automatically decrypted, allowing the vulnerability of the SQL injection to receive credit card numbers in plain text.
The site does not use TLS for all pages or supports weak encryption. The attacker monitors network traffic (e.g., on an unsecured wireless network), downgrades the connection from HTTPS to HTTP, intercepts requests, and steals the user’s session cookie. The attacker then replays those cookies and hijacks the user’s session (already authenticated), gaining access to the user’s private data.
The website security threats occur when a poorly configured XML parser processes XML input containing a reference to an external object. Most XML parsers are vulnerable to XXE attacks by default. It is primarily the responsibility of the developer to ensure that the application does not contain this vulnerability.
According to the OWASP Top 10, the main attack vectors for external XML objects (XXE) include the use of:
There are many variants of this attack, and the most common is brute force. In its essence, this is an attempt to enter many possible combinations. Here are the reasons that can make this kind of web attack successful:
One of the most common mistakes webmasters make is keeping the default CMS settings. Modern CMS applications, while easy to use, can be insecure for end users. Most web attacks are fully automated, and attackers rely on users having default settings. This means that many website security threats can be wiped out by changing the default settings when installing the CMS.
File permissions are another place, which should be enforced in the use of default settings.
Security misconfigurations can occur at any level of the application stack:
One example of application misconfiguration is Memcached servers used for DDoS attacks on services in the technology industry.
The server comes with sample applications that have known security flaws. Attackers can break into the server if one of these is the administrator console (and the default accounts have not been changed). The attacker logs in with the default passwords and takes control.
The cloud provider has sharing permissions by default. This allows attackers to access sensitive data in cloud storage.
The OWASP Top-10 notes that this web vulnerability was added to the list based on the results of an industry survey, not a study of quantifiable data.
Attackers will always try to “play” with everything interacting with an application, from URLs to serialized objects.
To simplify understanding some of the key concepts, let’s introduce you to the accepted terminology:
The React application calls a set of Spring Boot microservices. Being functional programmers, the developers tried to ensure that their code remained consistent. The solution they came up with was to serialize the user state and pass it back and forth with each request. The attacker notices the signature of the “R00” object and uses the Java Serial Killer tool to execute the code on the application server remotely.
The PHP forum uses the serialization of an object to store a supercookie containing the user’s ID, role, password hash, and other states. Then the attacker modifies the serialized object to gain administrator rights.
One of the attack vectors is a supercookie that contains serialized information about the logged-in user. This cookie specifies the user’s role.
When an attacker successfully deserializes this object, he or she changes the user’s permissions, gives himself the administrator’s role, and serializes the object again. This set of actions can create a considerable website security threat.
One of the most widespread session Riding or session hijacking attacks is a cross-site scripting (XSS) software attack. XSS is a standard web security issue that affects many sites. XSS attacks involve injecting malicious client scripts into a site and then using the site as a distributor.
The risks associated with this web vulnerability allow an attacker to inject content into the site and change its display. It forces the victim’s browser to execute code provided by the attacker when the page loads.
XSS vulnerabilities are present in about two-thirds of all applications. Typically, they require some type of user interaction, which must be initiated either through social engineering or by visiting a specific page. An unpatched XSS vulnerability can be very dangerous for any site.
According to the OWASP Top 10, there are three types of cross-site scripting:
The application or API includes unverified and unscreened user input in the HTML output. A successful attack will allow the attacker to load arbitrary HTML and execute JavaScript in the victim’s browser. Typically, the user needs to interact with some malicious link to a page controlled by the attacker.
An application or API stores raw user input that another user or administrator later views. Stored XSS code is often considered high or critical risk.
JavaScript frameworks, single-page applications, and APIs that dynamically include attacker-controlled data are vulnerable to DOM XSS.
These days, even simple sites, such as personal blogs, have many integrations with third-party services, plugins, and other applications that can become a site of attack.
Not being able to update every piece of software on the server and client-sides of a site, sooner or later, creates serious security risks.
In 2019, 56% of all CMS applications were out of date when they were infected.
It may sound overly dramatic, but every time you ignore an update warning, you allow an already known vulnerability to survive on your system. Trust me, cybercriminals are quick to investigate software and change lists.
Most content management systems (CMS) are subject to this web security threat. By default, everyone has access to the admin login page. In most cases, even the two-factor authentication (2FA) method is not used.
Here are a few examples of what we include in the concept of access:
Attackers can use authorization flaws for the following purposes:
To protect against this vulnerability, you need to follow the security principles described in OWASP during the design and configuration of the site.
The importance of web security cannot be underestimated. While 100 percent security is not an achievable goal, there are ways to keep your website under constant monitoring so that you can take immediate action when something happens.
Eventually, a lack of adequate monitoring can lead to increased damage from a website hack.
An open-source platform run by a small team was hacked using a vulnerability in its software. The attackers managed to destroy the internal repository with all the contents inside. The content could be recovered, but the lack of monitoring led to much more severe consequences.
Attackers are looking for users with a shared password. They can access all accounts with that password. For all other users, this scan leaves only one false login. After a few days, the process repeats, but with a different password.
Keeping audit logs allows you to be aware of any suspicious changes. This is a document in which all events occurring on the site are recorded. It enables you to detect any anomalies so that you can contact a specialist in time to confirm or deny a website attack.
As you can see, modern websites have a massive number of web security vulnerabilities, and we have listed only the most common ones. To ensure that your site is protected, you need to entrust its development to experts who use OWASP guidelines and strictly follow them.
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