CVE-2023-44487

Patch Tuesday: Redmond patches 71 security flaws and calls immediate attention to an exploited Windows zero-day reported by CrowdStrike.

ICS Patch Tuesday advisories have been published by Siemens, Schneider Electric, Rockwell Automation, Aveva and CISA.

New HTTP/2 DoS method named Continuation Flood can pose a greater risk than Rapid Reset, which has been used for record-breaking attacks.

Atlassian has released urgent patches for several of its products to fix remote code execution and denial-of-service vulnerabilities. Flaws in Atlassian products have been exploited by hackers before, including shortly after a patch was released or even before a fix was available. In October, Atlassian released an emergency fix for a broken access control issue […]

The largest and oldest bank in Russia Sberbank faced the record-breaking DDoS attack that reached 1 million RPS. Sberbank , the Russian banking and financial services giant, announced that it was recently hit by a record-breaking distributed denial of service (DDoS) attack that reached 1 million RPS. After the invasion of Ukraine, most Russian organizations […]

Cloudflare mitigated thousands of hyper-volumetric HTTP distributed denial-of-service (DDoS) attacks exploiting the flaw HTTP/2 Rapid Reset. Cloudflare DDoS threat report of 2023 states that the company has mitigated thousands of hyper-volumetric HTTP distributed denial-of-service attacks. 89 of the attacks mitigated by the company exceeded 100 million requests per second (rps), the largest attack peaked at […]

Cisco has released fixes to address two vulnerabilities – CVE-2023-20198 and CVE-2023-20273 – that hackers exploited to compromise tens of thousands of IOS XE devices. CVE-2023-20198 could allow a remote, unauthenticated attacker to create an account on an affected system with privilege level 15 access. The attacker can then use that account to gain control […]

Cisco’s recently disclosed Web UI-based critical zero-day has been confirmed to have more than 40,000 infected hosts, with over a fourth in the US alone. Closely tracking Cisco’s Web UI privilege escalation vulnerability (dubbed CVE-2023-20198), cybersecurity research firm Censys revealed that the number of compromised devices went down slightly on October 19 following hefty jumps […]

For the latest discoveries in cyber research for the week of 9th October, please download our Threat_Intelligence Bulletin. TOP ATTACKS AND BREACHES LockBit ransomware gang has claimed responsibility for an alleged attack on the multibillion-dollar IT products and services reseller CDW. The gang has demanded $80M ransom and threatened to release stolen data, said to […]

Here’s an overview of some of last week’s most interesting news, articles, interviews and videos: Turning military veterans into cybersecurity experts In this Help Net Security interview, James Murphy, the Director of the TechVets Programme at the Forces Employment Charity and member of Fortinet’s Veterans Program Advisory Council, discusses the challenges that military veterans face when transitioning from military to civilian life. Unmasking the limitations of yearly penetration tests In this Help Net Security interview, … More →

US CISA added the flaw CVE-2023-21608 in Adobe Acrobat Reader to its Known Exploited Vulnerabilities catalog. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added five new flaws to its Known Exploited Vulnerabilities Catalog, including a high-severity flaw (CVE-2023-21608) (CVSS score: 7.8) in Adobe Acrobat Reader. The flaw is a use-after-free issue, an attacker can trigger the flaw to achieve […]

Organizations respond to HTTP/2 Rapid Reset zero-day vulnerability exploited to launch the largest DDoS attacks seen to date.

Microsoft Patch Tuesday security updates for October 2023 fixed three actively exploited zero-day vulnerabilities. Microsoft Patch Tuesday security updates for October 2023 addressed a total of 103 vulnerabilities in Microsoft Windows and Windows Components; Exchange Server; Office and Office Components; ASP.NET Core and Visual Studio; Azure; Microsoft Dynamics; and Skype for Business. Three of the […]

A new DDoS technique named ‘HTTP/2 Rapid Reset’ is actively employed in attacks since August enabling record-breaking attacks. Researchers disclosed a new zero-day DDoS attack technique, named ‘HTTP/2 Rapid Reset’, that was exploited since August in record-breaking attacks. Google announced to have observed a new series of massive DDoS attacks that reached a peak of […]

Over the past two months attackers have been abusing a feature of the HTTP/2 web communication protocol that makes web application servers, load balancers, and web proxies vulnerable to distributed denial-of-service (DDoS) attacks of unprecedented scale. Google, AWS, Cloudflare, and other major cloud infrastructure providers, as well as web server vendors have been working on […]

On this October 2023 Patch Tuesday, Microsoft has released 103 patches and has fixed three actively exploited vulnerabilities (CVE-2023-36563, CVE-2023-41763, CVE-2023-44487). The exploited zero-days (CVE-2023-36563, CVE-2023-41763, CVE-2023-44487) CVE-2023-36563, discovered by Microsoft Threat Intelligence, is a WordPad vulnerability that could allow attackers to grab NTLM hashes (i.e., encrypted user passwords on Windows systems). “To exploit this vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted … More →

A zero-day vulnerability named HTTP/2 Rapid Reset has been exploited to launch some of the largest DDoS attacks in history.

Cloudflare, Google, and Amazon AWS revealed that a zero-day vulnerability in the HTTP/2 protocol has been used to mount massive, high-volume DDoS attacks, which they dubbed HTTP/2 Rapid Reset. Decoding HTTP/2 Rapid Reset (CVE-2023-44487) In late August 2023, Cloudflare discovered a zero-day vulnerability developed by an unknown threat actor. The vulnerability exploits the standard HTTP/2 protocol—a fundamental piece to how the Internet and most websites operate. HTTP/2 is responsible for how browsers interact with a … More →