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Server Security
Network configuration in Ubuntu 18.04 LTS using netplan
With Ubuntu 18.04 onwards, configuring IP addresses stands different from the older versions. When comparing with the previous versions the Ubuntu is using a new utility called Netplan – another order line arrange design utility, to arrange an IP address. Netplan has been presented by Ubuntu engineers in Ubuntu 17.10 where we no longer use the “interfaces” file to configure IP address but does the task using a YAML file with all default arrangement documents found under /etc/netplan/ directory. In this blog, we will check on how to design static …
Apache Struts 2 is an open-source development framework for Java applications. On March 6th, 2017, a vulnerability tracked as CVE-2017-5638 in Apache Struts 2 was made public. This vulnerability could allow an attacker to perform remote code execution with malicious Content. This particular vulnerability can be exploited if the attacker sends a request to upload a file to a vulnerable server that uses a Jakarta-based plugin to process the upload request. The attacker can then send malicious code in the Content-Type header to execute the command on a vulnerable server. …
A serious vulnerability named Dirty COW has been discovered recently which has put the Linux kernel under risk. It is said that this vulnerability was noticed nine years ago (since version 2.6.22 in 2007) and remained unnoticed throughout this time. A researcher named Phil Oester was the man behind the detection of this serious threat. According to him, the vulnerability is described as a race condition where the Linux kernel’s memory subsystem handles the copy-on-write (COW) breakage of private read-only memory mappings. In this way, the attackers gain write access to …
Security researchers identified a new OpenSSL vulnerability, called DROWN( Decrypting RSA with Obsolete and Weakened Encryption ) on March 2016. This attack was focused on servers that use the more secure TLS protocol, which also supports the obsolete SSLv2.This vulnerability allows an attacker to decrypt the highly secured TLS encrypted communication if the server houses SSLv2 cipher support. DROWN was assigned the CVE-2016-0800 id by the us-nert on the march (https://www.us-cert.gov/ncas/bulletins/SB16-067 ). More than 11 million websites that use TLS were vulnerable to DROWN attack. If your website is protected …
Now-a-days Brute force attacks to servers/websites are frequent. Brute force attack is generally a password guessing technique. It is a type of attack in which trying every possible combination of characters or data in order to find the decrypted message. A brute force guarantees finding the key – it’s trying every possible combination and does not rely on any potentially incomplete dictionaries or lists of possible keys. cPHulk Brute force Protection is an inbuilt protection used in WHM for preventing brute force attack. cPHulk Brute force Protection will detect and …
Installation and configuration of ‘Pyxsoft Antimalware’ in cPanel servers
Pyxsoft antimalware Plugin for cPanel/WHM protects your server from attacker scripts such as c99shell, r57shell, ANIShell, and hundreds more. It is a real-time Anti Malware for cPanel/WHM. Attackers can take control of your servers or can damage your customer’s data by uploading one of these scripts. Pyxsoft antimalware plugin works to protects your server in two ways: Protecting from the six server’s entrance SQL Injection Legitimate Access (SSH, cPanel etc) Web Forms FTP Brute Force Attacks Installed Trojans or shells
As we are aware, usually installing SSL Certificate requires Dedicated IP . The cost of this address is typically being passed down to the end user. Also the IPv4 address will be filled completely if every domain require a dedicated IP. So administrators decided to use multiple SSL installation on a single IP. Thus SNI (Server Name Identification) is established. >> What is SNI : —————— Server Name Indication (SNI) is an extension to the TLS protocol that indicates what hostname the client is attempting to connect. SNI is an …
The SSLv3 Poodle vulnerability which was released on October 14th 2014, is an attack on the SSL 3.0 protocol and it is completely protocol based vulnerability. POODLE stands for “Padding Oracle On Downgraded Legacy Encryption”. The padding attack happens when a plain text is converted to ciphertext. The plain text message often has to be expanded to be compatible with the underlying cryptographic structure and the leakage of data mainly occur during the decryption of the cipher text. The SSLv3 poodle vulnerability allows a man-in-the-middle attacker to decrypt ciphertext using …
VENOM vulnerability also known as QEMU exploit is the most recent vulnerability reported on May 13, 2015 and it is discovered by Jason Geffner while performing a security review of virtual machine hypervisors. VENOM stands for “Virtualized Environment Neglected Operations Manipulation”. This venom exploits QEMU, an open source machine emulator. The venom CVE-2015-3456 vulnerability resides in the virtual floppy drive code (FDC) used by the virtualization platforms. If it gets exploited, it allows an attacker to gain full control of the operating system hosting them and as well as on …