Category Archives: Security
According to statistics published in csoonline.com cyber crimes damages will hit 6 trillion by 2021 and 6 billion people target ( 75% of projected 8 billion population). As the access to network is increasing, hacking and committing cyber crime has become as easy as sending an email with malware link and its clicking by unsuspecting victims.
A botnet consists of a number of compromised hosts controlled by botnet controller managed by third parties . Bot net constitutes a major security threat and used to deploy malware, steal sensitive data, orchestrate DDoS attack. Once systems inside a network are compromised by installing malware it becomes very difficult to detect as the theft of data and sources of DDoS is orchestrated from within the network.
DNS sink hole is a process to identify the bot net master hosting malware software servers and assign the dns record of these hosts to localhost, non-existing or unused ip address . A valid ip is not returned for these host resolution and the infected host never connects to the bot net master server.
In order to understand how DNS Sink hole work we need to understand the bot net structure and its organization.
How a bot network is organized and activated ?
The initial part involves getting access to inside corporate network. This can be achieved in many ways like using brute force method to crack the passwords and encrypted data and other approach is rather simple, involving sending a link in email and betting on the chances that some users will click the link and deploy malware on their computers.
KRACK is a security flaw with WPA2 security and it allows to compromise wireless WPA security by forcing nonce reuse .
This is not an issue related to passwords but the protocol used by WPA and impacts pretty much all devices which uses wi-fi connection like phone, computers, wi-fi routers are impacted.
About CVE-2017-1000253 Bug:
This issue is related to the Linux kernel loaded Executable and Linkable Format (ELF) executables. If an ELF application was built as Position Independent Executable (PIE), the loader can allow part of that application’s data segment to map over the memory area reserved for its stack.
It can cause memory corruption and may allow an unprivileged local user to gain privileged access using Set owner User ID (SUID) or privileged flawed PIE binary.
netstat is a command line utility in Unix, Linux and Unix like systems to show information about
- network connections,
- routing tables,
- interface statistics,
- mas-querade connections
- multicast memberships
By default, netstat displays a list of open sockets of all configured address families , tcp , udp etc.
netstat provide very extensive network details and here are the top netstat usage with different options to get you the just the information you need.
SHA-1 is widely used in applications like SSL, SSH, TLS, IPsec PGP, S/MIME to protect the sensitive information.
Google has demonstrated that SHA-1 Collision is possible and two files can have the same SHA-1 hash. This means that system can be manipulated by presenting it with manipulated data with same hash as good data.