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The Hacker News - Cybersecurity News and Analysis: denial-of-service attacks

8 New HTTP/2 Implementation Flaws Expose Websites to DoS Attacks

8 New HTTP/2 Implementation Flaws Expose Websites to DoS Attacks
August 14, 2019Mohit Kumar
Various implementations of HTTP/2 , the latest version of the HTTP network protocol, have been found vulnerable to multiple security vulnerabilities affecting the most popular web server software, including Apache, Microsoft's IIS, and NGINX. Launched in May 2015, HTTP/2 has been designed for better security and improved online experience by speeding up page loads. Today, over hundreds of millions of websites, or some 40 percent of all the sites on the Internet, are running using HTTP/2 protocol. A total of eight high-severity HTTP/2 vulnerabilities , seven discovered by Jonathan Looney of Netflix and one by Piotr Sikora of Google, exist due to resource exhaustion when handling malicious input, allowing a client to overload server's queue management code. The vulnerabilities can be exploited to launch Denial of Service (DoS) attacks against millions of online services and websites that are running on a web server with the vulnerable implementation of HTTP/2 , knocking

DDoSing Hospital Networks Landed This Hacktivist in Jail for Over 10 Years

DDoSing Hospital Networks Landed This Hacktivist in Jail for Over 10 Years
January 11, 2019Mohit Kumar
A simple DDoS attack could land you in jail for 10 years or even more. A Massachusetts man has been sentenced to over 10 years in prison for launching DDoS attacks against the computer network of two healthcare organizations in 2014 to protest the treatment of a teenager at the centers. Beyond serving 121 months in prison, Martin Gottesfeld , 34, was also ordered by U.S. District Judge Nathaniel Gorton to pay nearly $443,000 in restitution for damages he caused to the targeted facilities. Gottesfeld carried out the DDoS attacks on behalf of the Anonymous hacker collective against Boston Children's Hospital (BCH) and Wayside Youth & Family Support Network—a nonprofit home treatment facility that provides a range of mental health counselings to children, young adults, and families in Massachusetts. In April 2014, the hacker used a botnet of over 40,000 network routers that he infected with customized malicious software to carry out the DDoS attacks that not only knocke

Google Finds 7 Security Flaws in Widely Used Dnsmasq Network Software

Google Finds 7 Security Flaws in Widely Used Dnsmasq Network Software
October 03, 2017Unknown
Security researchers have discovered not one or two, but a total of seven security vulnerabilities in the popular open source Dnsmasq network services software, three of which could allow remote code execution on a vulnerable system and hijack it. Dnsmasq is a widely used lightweight network application tool designed to provide DNS (Domain Name System) forwarder, DHCP (Dynamic Host Configuration Protocol) server, router ads and network boot services for small networks. Dnsmasq comes pre-installed on various devices and operating systems, including Linux distributions such as Ubuntu and Debian, home routers, smartphones and Internet of Things (IoT) devices. A shodan scan for "Dnsmasq" reveals around 1.1 million instances worldwide. Recently, Google's security team reviewed Dnsmasq and discovered seven security issues, including DNS-related remote code execution, information disclosure, and denial-of-service (DoS) issues that can be triggered via DNS or DHCP. &q

Even A Single Computer Can Take Down Big Servers Using BlackNurse Attack

Even A Single Computer Can Take Down Big Servers Using BlackNurse Attack
November 14, 2016Swati Khandelwal
Yes, you only need a single laptop with a decent internet connection, rather a massive botnet, to launch overwhelming denial of service (DoS) attacks in order to bring down major Internet servers and modern-day firewalls. Researchers at TDC Security Operations Center have discovered a new attack technique that lone attackers with limited resources (in this case, a laptop and at least 15Mbps of bandwidth) can use to knock large servers offline. Dubbed a BlackNurse attack or the low-rate " Ping of Death " attack, the technique can be used to launch several low-volume DoS attacks by sending specially formed Internet Control Message Protocol (ICMP) packets, or 'pings' that overwhelm the processors on server protected by firewalls from Cisco, Palo Alto Networks, among others. ICMP is a protocol used by routers and other networking devices to send and receive error messages. According to a technical report [ PDF ] published this week, the BlackNurse attack is mo

Critical DoS Flaw found in OpenSSL — How It Works

Critical DoS Flaw found in OpenSSL — How It Works
September 23, 2016Swati Khandelwal
The OpenSSL Foundation has patched over a dozen vulnerabilities in its cryptographic code library, including a high severity bug that can be exploited for denial-of-service (DoS) attacks. OpenSSL is a widely used open-source cryptographic library that provides encrypted Internet connections using Secure Sockets Layer (SSL) or Transport Layer Security (TLS) for the majority of websites, as well as other secure services. The vulnerabilities exist in OpenSSL versions 1.0.1, 1.0.2 and 1.1.0 and patched in OpenSSL versions 1.1.0a, 1.0.2i and 1.0.1u. The Critical-rated bug ( CVE-2016-6304 ) can be exploited by sending a large OCSP Status Request extension on the targeted server during connection negotiations, which causes memory exhaustion to launch DoS attacks, the OpenSSL Project said . What is OCSP Protocol? OCSP (Online Certificate Status Protocol), supported by all modern web browsers, is a protocol designed to perform verification and obtain the revocation status of a digital

602 Gbps! This May Have Been the Largest DDoS Attack in History

602 Gbps! This May Have Been the Largest DDoS Attack in History
January 09, 2016Swati Khandelwal
Cyber attacks are getting evil and worst nightmare for companies day-by-day, and the Distributed Denial of Service (DDoS) attack is one of the favorite weapon for hackers to temporarily suspend services of a host connected to the Internet. Until now, nearly every big website had been a victim of this attack, and the most recent one was conducted against the BBC 's websites and Republican presidential candidate Donald Trump 's main campaign website over this past holiday weekend. Out of two, the largest DDoS attack in the history was carried out against the BBC website: Over 600 Gbps . Largest DDoS Attack in the History The group calling itself New World Hacking claimed responsibility for taking down both the BBC's global website and Donald Trump's website last week. The group targeted all BBC sites, including its iPlayer on-demand service, and took them down for at least three hours on New Year's Eve. At the moment, the BBC news organiz

Chinese Hackers tried to Take Down Tibetan Social Networking Website

Chinese Hackers tried to Take Down Tibetan Social Networking Website
January 04, 2016Wang Wei
Tibet is an area in the Republic of China that has been the point of conflict for many years in China. While China believes that Tibet has been under Chinese rule for many centuries, Tibetans claim that they declared itself an independent republic in 1912. Tibetan Groups, especially pro-democracy activists, are being repeatedly targeted by persistent Cyber Attacks by Chinese State-sponsored hackers. Our Sources in Tibetan Community told The Hacker News that they are once again being targeted by Chinese hackers; this time their social network website. Chinese hackers are believed to have targeted a Tibetan only social networking site, unitib.com ( United Tibet ) as Beijing views the platform as a threat promoting free Tibet movement. The Unitib technical team sought assistance from Taiwanese and Indian security experts after they were forced to take the platform offline for few days due to the attack. Tashi, a member of the technical team at Unitib told The Hac

DDoS Botnet Leverages Thousands of Insecure SOHO Routers

DDoS Botnet Leverages Thousands of Insecure SOHO Routers
May 13, 2015Swati Khandelwal
Small office and home office (SOHO) routers are an increasingly common target for cybercriminals, not because of any vulnerability, but because most routers are loosely managed and often deployed with default administrator credentials. A new report suggests that hackers are using large botnet of tens of thousands of insecure home and office-based routers to launch Distributed Denial-of-Service ( DDoS ) attacks . Security researchers from DDoS protection firm Incapsula uncovered a router-based botnet, still largely active while investigating a series of DDoS attacks against its customers that have been underway since at least last December, 2014. Over the past four months, researchers have recorded malicious traffic targeting 60 of its clients came from some 40,269 IP addresses belonging to 1,600 ISPs around the world. Almost all of the infected routers that were part of the botnet appear to be ARM-based models from a California-based networking company Ubiquiti Net

iOS 8 Vulnerability Lets Hackers Crash Any iPhone and iPad Within Wi-Fi Range

iOS 8 Vulnerability Lets Hackers Crash Any iPhone and iPad Within Wi-Fi Range
April 22, 2015Swati Khandelwal
Security researchers have uncovered a zero-day vulnerability in iOS 8 that could repeatedly crash users' Apple iPhones, iPads and iPods when the devices connect to a malicious wireless hotspot. It's like Denial of Service (DoS) attack on Apple's iOS devices that results in crashing either individual iOS apps or users' entire iPhones. NO iOS ZONE Adi Sharabani and Yair Amit of Mobile security firm Skycure presented their latest research, titled " No iOS Zone ", at the RSA security conference in San Francisco on Tuesday. The duo showed: It is possible for an attacker to create malicious Wi-Fi networks in order to crash nearby users' mobile devices with incredible accuracy. Also, even the "No iOS Zone" attack is capable to make iOS things within the range completely unusable by triggering constant numbers of reboots. It is nothing but a DoS attack… ...that makes the device inaccessible by its users, just like in the ca

Crash Your Friends' WhatsApp Remotely with Just a Message

Crash Your Friends' WhatsApp Remotely with Just a Message
December 01, 2014Swati Khandelwal
A Vulnerability has been discovered in the wildly popular messaging app WhatsApp , which allows anyone to remotely crash WhatsApp just by sending a specially crafted message, two security researchers reported ' The Hacker News '. Two India based independent security researchers, Indrajeet Bhuyan and Saurav Kar, both 17-year old teenagers demonstrated the WhatsApp Message Handler vulnerability to one of our security analyst. In a video demonstration, they showed that how a 2000 words (2kb in size) message in special character set can crash Whatsapp messenger app. Previous it was discovered that sending a huge message ( greater than 7mb in size) on Whatsapp could crash victim device and app immediately, but using this new exploit attacker only need to send a very small size (approx 2kb) message to the victim. The worried impact of the vulnerability is that the user who received the specially crafted message will have to delete his/her whole conversation and start a fresh

Reflection DDoS Attacks Using Millions of UPnP Devices on the Rise

Reflection DDoS Attacks Using Millions of UPnP Devices on the Rise
October 17, 2014Swati Khandelwal
After successful in launching reflection and amplification Distributed Denial-of-Service (DDoS) attacks by abusing various protocols such as DNS, NTP and SMTP, hackers are now abusing Simple Service Discovery Protocol (SSDP) – part of the UPnP protocol standard – to target home and office devices, researchers warned. SSDP is a network protocol based on the Internet Protocol Suite that comes enabled on millions of networked devices, such as computers, printers, Internet gateways, Router / Wi-Fi access points, mobile devices, webcams, smart TVs and gaming consoles, to discover each other and automatically establish working configurations that enable data sharing, media streaming, media playback control and other services. FLAW IN UPnP USED IN AMPLIFICATION DDoS ATTACK Prolexic Security Engineering & Response Team (PLXsert) at Akamai Technologies have issued a warning that the devices use in residential or small office environments are being co-opted into reflection

Adobe Releases Critical Security Updates for Acrobat and Reader

Adobe Releases Critical Security Updates for Acrobat and Reader
September 18, 2014Swati Khandelwal
After a week delay, Adobe has finally pushed out critical security updates for its frequently-attacked Reader and Acrobat PDF software packages to patch serious vulnerabilities that could lead to computers being compromised. The new versions of Adobe Reader and Acrobat released Tuesday for both Windows and Macintosh computers address eight vulnerabilities, five of which could allow for remote code execution . The remaining three vulnerabilities involve a sandbox bypass vulnerability that can be exploited to escalate an attacker's privileges on Windows, a denial-of-service (DoS) vulnerability related to memory corruption, and a cross-site scripting (XSS) flaw that only affects the programs on the Mac platform. According to Adobe's advisory , applying the patches will involve a system restart. The affected versions are: Adobe Reader XI (11.0.08) and earlier 11.x versions for Windows Adobe Reader XI (11.0.07) and earlier 11.x versions for Macintosh Adobe Reade

Remote Attack Could Format Your Pebble Smartwatch Easily

Remote Attack Could Format Your Pebble Smartwatch Easily
August 22, 2014Swati Khandelwal
Pebble, a wristwatch that can connect to your phone - both iOS and Android - and interact with apps, has a hard-coded vulnerability that allows a remote attacker to destroy your Smartwatch completely. Pebble Smartwatch , developed and released by Pebble Technology Corporation in 2013, is considered as one of the most popular SmartWatches that had become the most funded project in the history of Kickstarter. Just two hours after its crowd-funding campaign launched, Pebble had already surpassed its $100,000 goal and at last had reached over $10.25 million pledged by nearly 70,000 Kickstarter backers. A security enthusiast Hemanth Joseph  claimed to have found that his Pebble SmartWatch with the latest v2.4.1 Firmware can be remotely exploited by anyone with no technical knowledge in order to delete all data stored in the device, apps, notes, and other information stored in it. HOW PEBBLE SMARTWATCH WORKS Before proceeding towards how he did this, let me explain how Peb

Hacking Traffic Lights is Amazingly Really Easy

Hacking Traffic Lights is Amazingly Really Easy
August 21, 2014Swati Khandelwal
Hacking Internet of Things (IoTs) have become an amazing practice for cyber criminals out there, but messing with Traffic lights would be something more crazy for them. The hacking scenes in hollywood movies has just been a source of entertainment for the technology industry, like we've seen traffic lights hacked in Die Hard and The Italian Job , but these movies always inspire hackers to perform similar hacking attacks in day-to-day life. Security researchers at the University of Michigan have not only hacked traffic light signals in real life, but also claimed that it's actually shockingly easy to perform by anyone with a laptop and the right kind of radio. If we compare the traffic light hacks in movies and real life, the reality is much easier. In a paper study published this month, the security researchers describe how a series of major security vulnerabilities in traffic light systems allowed them to very easily and very quickly seized control of the whole system of at

Anonymous Group Takes Down Mossad's Website Over Gaza Conflict

Anonymous Group Takes Down Mossad's Website Over Gaza Conflict
August 01, 2014Wang Wei
The hacktivist group Anonymous has reportedly taken down the official website of the Israeli intelligence agency Mossad against Israel's military incursion in Gaza, which has resulted in hundreds of civilian casualties. The government of Israel has yet to comment on the Mossad hack attack. The ' Hacktivists ' were able to take down Mossad's website in a Distributed Denial of Service (DDoS) attack early morning, claims a statement on one of the Anonymous hacker's Twitter account. The attack on the website is supposed to be severe as it has been over 10 hours and the site is still down at the time of writing. OPERATION SAVE GAZA The Anonymous group has already targeted a number of other Israeli organizations as part of a campaign titled " Operation Save Gaza " in the mission to stop this " massacre ." Anonymous group has also claimed responsibility of taking down multiple Israeli government sites following the death of one of the organization's members. The member n

Snapchat app vulnerable to denial-of-service attack, allows remotely crash iPhone

Snapchat app vulnerable to denial-of-service attack, allows remotely crash iPhone
February 08, 2014Anonymous
SNAPCHAT , photo sharing app is the majority choice for variety of users. Recently, the company has faced data breach and Captcha bypass vulnerability, and just yesterday a new denial-of-service attack has been revealed which can crash an iPhone . Jamie Sanchez , a security researcher has found the app vulnerable, which can enable a hacker to launch a denial-of-service attacks , resulting prompt the user to reset the mobile device. The flaw into the Snapchat app allows someone to flood a user with thousands of messages in a measure of seconds, " By reusing old tokens, hackers can send massive amounts of messages using powerful computers. This method could be used by spammers to send messages in mass quantities to numerous users, or it could be used to launch a cyber attack on specific individuals " he said. He demonstrated the vulnerability to LA Times reporter, bombarded his handset with thousands of messages within five seconds in a denial-of-service

10th Anniversary of the World's first Mobile Malware 'Cabir'

10th Anniversary of the World’s first Mobile Malware 'Cabir'
January 27, 2014Swati Khandelwal
The year 2014 starts with the formation of new mobile malware like ' Android . HeHe ', with the ability to steal text messages, intercept phone calls, and other malware such as ' XXXX . apk ' uses WiFi networks or hotspots to steal information, infected more than 24,000 Devices. But it should not be forgotten by us that 2014 marks the 10th Anniversary of the World's First mobile malware . FortiGuard Labs has published a whitepaper  that briefly explains the major mobile threats from 'Cabir' to 'FakeDefend' over the last decade. The world's first mobile malware was ' Cabir ', detected in 2004 when mobiles were not so popular among all of us. It was developed by the group of hackers known as 29A , designed to infect the Nokia Series 60 , the most popular Smartphone platform with tens of millions users worldwide at that time. The name " Caribe " appears on the screen of the infected phones and the worm spreads itself by seeking other devices such as

100Gbps DDoS attack took down Gaming servers with NTP Servers

100Gbps DDoS attack took down Gaming servers with NTP Servers
January 13, 2014Swati Khandelwal
The New Year begins with a new form of amplified Distributed Denial of Service (DDoS) Attack, a weapon for attackers to bring down websites and servers. As we have reported two weeks ago that the attackers are abusing the Network Time Protocol (NTP) servers to perform an amplified version of DDoS Attack on various targets across the world. Earlier this week a number of popular Gaming services, including League of Legends, EA.com and Battle.net from Blizzard were taken down by similar DDoS attack . 'Network Time Protocol (NTP)' is a distributed network clock time synchronization protocol that is used to synchronize computer clock times in a network of computers and runs over port 123 UDP. " The attacker sends a small spoofed 8-byte UDP packets are sent to the vulnerable NTP Server that requests a large amount of data (megabytes worth of traffic) be sent to the DDoS's target IP Address.  "Security Researcher, Wang Wai  detailed  in a previous article on 'The

DDoS Attacks : A Serious unstoppable menace for IT security communities

DDoS Attacks : A Serious unstoppable menace for IT security communities
October 18, 2013Anonymous
It should be the busiest day of the year for your business, but your website has just disappeared off the Internet and orders have dried up. If this happens to you, then you likely just become yet another victim of a distributed denial of service (DDoS) attack . By now, everyone who uses the Internet has come across DDoS attacks . It is one of the oldest attack technologies on the web, and a popular way of paralyzing the huge data centers. Just yesterday we have reported about a massive 100Gbps DDoS attack that hit World's 3rd Largest Chinese Bitcoin exchange for 9 hours. Arbor Networks, a leading provider of DDoS and advanced threat protection solutions, today released data on global distributed denial of service (DDoS) attack trends for the first three quarters of 2013, revealed that this kind of attack still represents a serious menace for IT security communities.  The document provides an interesting overview into Internet traffic patterns and threat evolutio
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