SANS Stormcast Friday, August 8th, 2025:: ASN43350 Mass Scans; HTTP1.1 Must Die; Hyprid Exchange Vuln; Sonicwall Update; SANS.edu Research: OSS Security and Shifting Left (#)

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SANS Stormcast Friday, August 8th, 2025:: ASN43350 Mass Scans; HTTP1.1 Must Die; Hyprid Exchange Vuln; Sonicwall Update; SANS.edu Research: OSS Security and Shifting Left Mass Internet Scanning from ASN 43350 Our undergraduate intern Duncan Woosley wrote up aggressive scans from ASN 43350 https://isc.sans.edu/diary/Mass+Internet+Scanning+from+ASN+43350+Guest+Diary/32180/#comments HTTP/1.1 Desync Attacks Portswigger released details about new types of HTTP/1.1 desync attacks it uncovered. These attacks are particularly critical for organizations using middleboxes to translate from HTTP/2 to HTTP/1.1 https://portswigger.net/research/http1-must-die Microsoft Warns of Exchange Server Vulnerability An attacker with admin access to an Exchange Server in a hybrid configuration can use this vulnerability to gain full domain access. The issue is mitigated by an April hotfix, but was not noted in the release of the April Hotfix. https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53786 Sonicwall Update Sonicwall no longer believes that a new vulnerability was used in recent compromises https://www.sonicwall.com/support/notices/gen-7-and-newer-sonicwall-firewalls-sslvpn-recent-threat-activity/250804095336430 SANS.edu Research: Wellington Rampazo, Shift Left the Awareness and Detection of Developers Using Vulnerable Open-Source Software Components https://www.sans.edu/cyber-research/shift-left-awareness-detection-developers-using-vulnerable-open-source-software-components/ keywords: http/1.1; http request smuggeling; http/2; asn 43350; exchange; sonicwall; SANS.edu; research; shiftin left; wellington; rampazo

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