#denialofservice

[autumnalfoxfire]

I am very happy to present my first comic collaboration!

Denial of Service

Written by @MorganDyneira, DoS tells the story of a crazy, not-at-all prophesied, alternative version of our near-future.

We hope you enjoy!

[definitelytzar]

CISA Adds Actively Exploited SolarWinds Serv-U DoS Flaw to KEV Catalog

The Cybersecurity and Infrastructure Security Agency (CISA) has added a high-severity SolarWinds Serv-U Denial-of-Service (DoS) vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog following confirmed evidence of active exploitation. The directive requires Federal Civilian Executive Branch (FCEB) agencies to remediate the flaw by June 19, 2026, while private sector organizations are strongly urged to patch immediately.

The Vulnerability: CVE-2026-28318

Tracked as CVE-2026-28318, this unauthenticated DoS flaw carries a CVSS score of 7.5 and targets the Serv-U multi-protocol file server service. The vulnerability allows attackers to crash the Serv-U service by sending specially crafted POST requests that include the Content-Encoding: deflate header. No authentication is required, making it trivial to exploit at scale.

The attack works by triggering uncontrolled resource consumption within the Serv-U process. When the malformed request is received, the service attempts to process the deflate encoding but fails to handle the resource allocation properly, resulting in a complete service crash. This renders the file server unavailable until manual intervention restarts the service.

Why This Matters: The KEV Catalog Significance

CISA's KEV Catalog is not a routine advisory—it is a prioritized list of vulnerabilities that are actively being weaponized in the wild. Inclusion in the KEV catalog signals that:

- Exploitation Is Confirmed: This is not theoretical; attackers are actively using this flaw in real-world attacks - Remediation Is Mandatory for FCEB: Federal agencies face a hard deadline (June 19, 2026) to patch or face compliance consequences - Private Sector Should Prioritize: While not mandated, CISA's guidance makes clear that all organizations treating cybersecurity seriously should treat this as urgent

Remediation and Mitigation Options

SolarWinds has released a security update—Serv-U version 15.5.4 HF1—that addresses CVE-2026-28318. Organizations should prioritize this patch above all else.

For environments where immediate patching is not feasible, CISA and SolarWinds recommend the following mitigations:

- IP Access Restrictions: Limit Serv-U access to known, trusted IP addresses only. This reduces the attack surface by preventing unauthenticated connections from unknown sources - Block Content-Encoding Headers: Configure web application firewalls (WAFs) or reverse proxies to block any POST requests containing the content-encoding header. The vulnerable service does not require this functionality for legitimate operations - Monitor for Crash Events: Implement logging and alerting for unexpected Serv-U service terminations. Sudden crashes may indicate active exploitation attempts

Strategic Context: SolarWinds Under Renewed Scrutiny

This incident occurs against the backdrop of SolarWinds' long recovery from the catastrophic 2020 SUNBURST supply chain attack. While CVE-2026-28318 is not a supply chain compromise or remote code execution flaw, its addition to the KEV catalog reinforces that SolarWinds products remain high-value targets for adversaries.

For security teams, the lesson is clear: vendors with historical exposure attract persistent scrutiny from attackers. Every new vulnerability in their portfolio is assumed to be weaponized until proven otherwise.

The Bottom Line

CVE-2026-28318 is a straightforward DoS flaw, but its inclusion in the KEV catalog elevates it from a routine bug to a priority remediation item. For FCEB agencies, patching is mandatory within two weeks. For everyone else, the math is simple: an unauthenticated DoS that requires no user interaction and can be exploited en masse is exactly the kind of low-effort, high-impact attack that botnets and ransomware operators love. Patch now, mitigate if you must, but do not ignore this advisory. When CISA says "actively exploited," they mean it.

[cyberdudebivash-news]

CVE-2025-13878: The One-Packet Kill for BIND DNS Servers.

Read the full report on -

CVE-2025-13878: The One-Packet Kill for BIND DNS Servers.

CyberDudeBivash News delivers daily cybersecurity threat intel, CVE alerts, malware trends, and crypto security briefings.

[whiztekcorp]

Critical .NET Security Updates Released for July 2024

Remote Code Execution Vulnerabilities in .NET 6.0 and 8.0

Denial of Service Vulnerabilities affecting .NET 8.0

As developers, it's crucial that we stay on top of these security patches to maintain the integrity and safety of our applications. Failing to update could leave our systems exposed to potential attacks.The .NET team has been hard at work to identify and resolve these issues, and we commend their commitment to keeping the framework secure. 👏If you haven't already, make sure to update your .NET 6.0 and 8.0 installations as soon as possible. The stability and protection of our applications depend on it!

Check out www.whiztekcorp.com

[scienza-magia]

La misteriosa figura oscura del creatore dei Bitcoin

Le ultime corrispondenze di Satoshi Nakamoto, il creatore di Bitcoin, in merito ai suoi progetti futuri. Dodici anni fa, precisamente il 23 aprile 2011, un individuo noto come Satoshi Nakamoto, il creatore di Bitcoin, scrisse una delle sue ultime corrispondenze con lo sviluppatore di software Mike Hearn. Nello specifico, la mente dietro Bitcoin aveva dichiarato che lui, lei o loro erano “passati ad altre cose” e ha affermato con sicurezza che il progetto era stato affidato in “buone mani”. Di seguito tutti i dettagli. Satoshi Nakamoto crea Bitcoin e scompare nel nulla Come sappiamo, dopo la creazione di Bitcoin e l’implementazione iniziale della tecnologia, il misterioso Satoshi Nakamoto è scomparso dalla scena pubblica nel dicembre del 2010. In particolare, l’ultimo messaggio pubblico di Nakamoto è stato emesso il 12 dicembre dello stesso anno, quando Nakamoto ha sottolineato che “c’è altro lavoro da fare su DoS (denial-of-service)”.

Bitcoin: le ultime e-mail di Satoshi Nakamoto Successivamente, il creatore di Bitcoin ha tenuto una corrispondenza con alcuni degli sviluppatori dietro la prestigiosa crypto, tra cui Mike Hearn e Gavin Andresen. Hearn, nello specifico, ha ricevuto un’e-mail da Nakamoto il 23 aprile 2011, intitolata “Tenere monete in uno stato non spendibile per una finestra temporale continua”. Al tempo stesso, proprio Hearn chiedeva informazioni sulla possibilità del ritorno di Nakamoto nella comunità Bitcoin. Ed è stato a quel punto che Nakamoto ha affermato che lui, lei o loro erano “passati ad altre cose”, dichiarando con fermezza che il progetto era in “buone mani con Gavin e gli altri”. Il creatore di Bitcoin, inoltre, aveva anche rinnovato la speranza per il continuo sviluppo di Bitcoinj, la versione Java di Bitcoin di Mike Hearn, in quanto offre agli sviluppatori Java qualcosa su cui lavorare. Pochi giorni dopo questi fatti, Andresen ha ricevuto un’e-mail da Nakamoto in cui questo esprimeva frustrazione per il ritratto negativo ricevuto dalla stampa, come si legge: “Vorrei che non continuassi a parlare di me come di una misteriosa figura oscura. La stampa lo trasforma in un angolo di valuta pirata. Invece occupati del progetto open source e dai più credito ai tuoi contributori di sviluppo; aiuta a motivarli.”  È importante sottolineare che proprio questa mail è considerata l’ultima comunicazione conosciuta dall’enigmatico creatore di Bitcoin a chiunque. Le speculazioni in merito all’identità segreta Alcune delle speculazioni più importanti in merito all’identità del misterioso creatore di Bitcoin Satoshi Nakamoto sono avvenute il 7 marzo 2014, quando un articolo su Newsweek aveva affermato che il creatore di Bitcoin era un giapponese-americano di 64 anni di nome Dorian Nakamoto.  Tuttavia, un messaggio presumibilmente scritto da Nakamoto, è apparso sul forum online della P2P Foundation per smentire quanto sostenuto, come si legge: “Non sono Dorian Nakamoto.”  Da allora, non sono emersi ulteriori messaggi dal creatore di Bitcoin e di conseguenza le e-mail a Hearn e Andresen rimangono l’ultima traccia di testimonianze da parte di Nakamoto da oltre dieci anni. Ma perché si pensava proprio a Dorian Nakamoto dietro l’identità nascosta dell’inventore di Bitcoin? Tutto inizia appunto nel 2014, quando Leah McGrath Goodman di Newsweek ha pubblicato un articolo, di cui sopra, in cui affermava che si trattava del residente in California Dorian Nakamoto. Come ben sappiamo, negli ultimi undici anni ci sono state numerose identità che si sono autoproclamate di essere Satoshi, così come quelli che sono stati accusati da terzi di esserlo. La maggior parte dei sospetti, inoltre, aveva qualche legame con il movimento cypherpunk, ma non il sospettato di Goodman, il quale ha passato due mesi a indagare sulla sua storia. Nello specifico, uno dei maggiori punti di forza a sostegno del fatto che l’inventore di Bitcoin fosse Dorian Nakamoto risiede nel suo nome di nascita, che a quanto pare è proprio Satoshi Nakamoto. Inoltre, quando Goodman è arrivato a casa di Dorian in California, quest’ultimo aveva dichiarato che “non era più coinvolto in questo” e che “non può discuterne”. Il commento ha dunque spinto Goodman e le sue coorti di Newsweek a presumere che stesse parlando della creazione di Bitcoin, motivo per cui si è poi scatenata la teoria di cui sopra. Le teorie più importanti in merito all’identità del creatore di Bitcoin Satoshi Nakamoto Come si può facilmente immaginare, le teorie sulla vera identità di Satoshi Nakamoto sono numerose, in quanto nessuno veramente sa se è un uomo, una donna, un insieme di persone o altro ancora. Per risalire all’identità, dunque, all’inizio alcuni erano partiti dall’origine del nome giapponese. Infatti, in giapponese “satoshi” significa “un pensiero chiaro, veloce e saggio”. Mentre, “Naka” può significare “medium”, “dentro” o “relazione”. Infine, “Moto” può significare “origine” o “fondamento”. Tuttavia, non è mai stato verificato che questi significati possano ricondurre all’identità dietro la persona che ha inventato Bitcoin. Inoltre, in un secondo momento, si era pensato a Michael Clear, laureato in crittografia al Trinity College. Tuttavia, Clear ha negato ogni suo possibile coinvolgimento dietro l’invenzione di Bitcoin. Altri ancora sospettavano di Vili Lehdonvirta, ex sviluppatore di giochi finlandese, ma anch’egli ha smentito qualsiasi legame con Satoshi. Non solo, nel 2017, dopo una soffiata di un dipendente di SpaceX, è apparsa l’idea sul web che dietro allo pseudonimo si nascondesse Elon Musk, teoria poi smentita dallo stesso imprenditore sul suo account Twitter. Come abbiamo visto, le teorie negli anni sono balzate da una persona all’altra, fino ad arrivare alle dichiarazioni di Wright del 2016. Wright, al momento, sembra essere la personalità più accreditata per essere la mente dietro la creazione di Bitcoin. Ad ogni modo, in tutti questi anni ci sono state solo speculazioni, molte delle quali smentite. Dunque, molti dubbi e pochissime certezze in merito all’identità nascosta dietro lo pseudonimo di Satoshi Nakamoto. Viene spontaneo chiedersi se sapremo mai chi è veramente l’ideatore della famosa crypto Bitcoin. Read the full article

[arashtadstudio]

What is DoS Attack and How to Prevent it?

Denial-of-Service attacks (DoS) shut down a machine or network by flooding it with traffic or sending information that triggers it to crash, preventing its users from accessing it. DoS attacks accomplish this by flooding the target with traffic. The DoS attack robs legitimate users (e.g. employees, members, or account holders) of the services or resources they expect. Often, DoS attacks target the web servers of high-profile organizations, such as banks, commerce, and media firms, as well as government agencies and trade associations. Although DoS attacks rarely result in the theft or loss of significant information or assets, they can cost the victim a lot of time and money to handle. How Does a DoS Attack happen? Often, DoS events are caused by the overloading of a service's underlying systems. In order to clarify how overload-based DoS attacks work, let's imagine an attack on a shopping website. The requests that you make when you shop online pass through your Internet Service Provider's network. Through one or more exchanges, and out to other providers' networks. Once your clicks have passed through the hosting service, they reach the shopping site's infrastructure.Each server within a shopping site will do a small part of the work needed to create the page you see. These include database servers that provide product lists and application servers that interpret product information. And also, web servers that create the pages you are viewing. Like humans, each server can only do so much work in a given period of time. Thus, when too many users request pages from a shopping site at once, the infrastructure or servers may not be able to handle everyone's requests in a timely manner. This may result in some or all users not being able to view the shopping site. or, to put it another way, they are unable to access the service.DoS and DDoS:In a Dos attack, the attacker employs a small number of attacking systems (possibly just one) to overload the target. This was the most common approach to attacking the Internet during the early days when services were small and security technology was developing rapidly. Nevertheless, nowadays, a simple DoS attack is usually easy to ward off since the attacker is easily identifiable and blocked. Industrial control systems may be notable exceptions to this, as equipment may not tolerate bogus traffic well, or may be connected via low bandwidth connections that are easily saturated. On the other hand, in DDos (stands for Distributed Denial of Service) attacks, an attacker recruits (many) thousands of Internet users to send a small number of requests each, which, when combined, overload the target. These participants may be willing accomplices (for example, attacks initiated by loosely organized illegal "hacktivist" groups) or unwitting victims whose machines have been infected with malware.Different Types of DoS Attacks: Volume Based AttacksFlooding attacks include UDP floods, ICMP floods, and other spoofed packet floods. The attack aims to overload the attacked site's bandwidth and is measured in bits per second (Bps).Protocol AttacksAmong them are SYN floods, fragmented packet attacks, Pings of Death, and Smurf DDoS attacks. These attacks consume the actual server resources or those of intermediate communication equipment, such as firewalls and load balancers, and are measured in packets per second (Pps).Application Layer AttacksThere are many types of attacks in this class. These attacks include low-speed attacks, GET/POST floods, attacks on Apache, Windows, or OpenBSD vulnerabilities, and more. Usually composed of seemingly innocent and legitimate requests, these attacks aim to crash the web server. The magnitude of these requests is measured in Requests per second (Rps).Different Types of DDoS Attacks: UDP FloodUser Datagram Protocol (UDP) floods, by definition, are DDoS attacks that flood a target with UDP packets. Their goal is to flood random ports on a remote server. It causes the host to keep checking for applications listening on that port, and (when none are found) reply with an ICMP 'Destination Unreachable' packet. This consumes host resources, resulting in unavailability.ICMP (Ping) FloodThis attack is similar to the UDP flood attack in that the target resource is the subject of the attack with ICMP Echo Request (ping) packets. Due to ICMP Echo Reply packets that the victim’s server sends, this type of attack consumes both outgoing and incoming bandwidth.SYN FloodAs a result of a weakness in TCP connection sequence (the "three-way handshake"), an SYN flood DDoS attack exploits a feature of an SYN request. This feature consists of the fact that in order to initiate a TCP connection with a host, an SYN request must be followed by an SYN-ACK reply from that host. And also an ACK response from the requester must come in the following. SYN floods occur when the requester sends multiple SYN requests without acknowledging the host's SYN-ACK response or sends the SYN requests from a spoofed IP address. In either case, the host system keeps waiting for acknowledgments to each request, binding resources until new connections are not possible, resulting in a denial of service.Ping of Death In a POD attack, the attacker sends multiple malformed or malicious pings to a computer. the maximum IP packet length is 65,535 bytes (including headers). Nevertheless, the Data Link Layer usually limits the maximum frame size – for example, 1500 bytes over an Ethernet network. In this case, a large IP packet consists of multiple IP packets, and the recipient host reassembles the IP fragments into a complete packet. The recipient ends up with an IP packet with more than 65,535 bytes when reassembled as a result of malicious manipulation of fragment content in a Ping of Death scenario. The packet overflows the memory buffer, causing legitimate packets to underperform.HTTP Flood A DDoS attack involving HTTP floods exploits a web server or application using seemingly legitimate HTTP GET or POST requests. HTTP floods don't use sub-standard packets, spoofing, or reflection techniques, and take less bandwidth than other attacks to bring down a site or server. When a server or application has to allocate maximum resources to every request, the attack is most effective.NTP Amplification In NTP amplification attacks, the perpetrator exploits publicly-accessible Network Time Protocol (NTP) servers to overwhelm a victim server with UDP traffic. the name of the attack is amplification assault because the query-to-response ratio is anywhere from 1:20 to 1:200. In other words, if an attacker obtains a list of open NTP servers (e.g., by using Metasploit or Open NTP Project data), he or she can easily launch a devastating DDoS attack that is high-bandwidth and high-volume.SlowrisWith Slowloris, one web server can take down another without affecting other services or ports on the target network. Slowloris does this by keeping as many connections as possible open to the target web server. Using Slowloris, the target server has a connection, but only a partial request is sent to the server. Slowloris constantly sends more HTTP headers, but never completes a request. the target server keeps each of these false connections open until the maximum concurrent connection pool reaches the overflow level, which prevents legitimate clients from connecting.Conclusion: In this article, you learned about DoS and DDoS attacks and their different types. Most of the attacks occur by creating an overload of requests to the target server by the attacker. The attacker may have different motivations such as a political reason, boredom, money extortion, etc. The Overload DoS attacks may happen on the application layer or the network layer. Download this Article in PDF format Arashtad Custom Services In Arashtad, we have gathered a professional team of developers who are working in fields such as 3D websites, 3D games, metaverses, and other types of WebGL and 3D applications as well as blockchain development. Visit Our Services Arashtad Serivces Drop us a message and tell us about your ideas. Fill in the Form Blockchain Development

[kryptobia]

Solana attributes major outage to denial-of-service attack targeting DEX offering https://kryptobia.com/solana-attributes-major-outage-to-denial-of-service-attack-targeting-dex-offering/?utm_source=dlvr.it&utm_medium=tumblr

[freemiumworldblog]

What is a Distributed Denial-of-Service (DDoS) attack? How does it work?

What is a Distributed Denial-of-Service (DDoS) attack? How does it work?

Disbursed denial of provider or DDoS for brief tries to make an internet site unavailable through overwhelming it with undesirable site visitors from more than one computer systems. To hold out the DDoS assaults, hackers most commonly tries to unfold malicious recordsdata to inclined computer systems thru inflamed emails and attachments.

What’s a Disbursed Denial-of-Provider (DDoS) assault?…

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