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Microsoft Patch Tuesday
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DDRop Attack Forces Intel TDX Confidential VMs Into Debug Mode and Exposes Memory
KU Leuven and ETH Zurich researchers released DDRop PoC hardware that forces Intel TDX confidential VMs into debug mode and exposes plaintext memory.
Researchers from KU Leuven, ETH Zurich, Google, and Durham University published proof-of-concept code, hardware designs, and firmware for DDRop, a DDR5 interposer that injects parity errors to drop selected cache-line writebacks. Because Intel TDX, Intel Scalable SGX, and AMD SEV-SNP lack per-line cryptographic freshness, processors decrypt and accept stale DRAM contents as current state. The PoC flips a victim's ATTRIBUTES.DEBUG flag to enable TDX debug mode, then copies victim memory in plaintext and can forge attestation reports. Affected environments include Intel 5th- and 6th-generation Xeon Scalable with TDX; Intel says the attack falls outside its cloud-computing threat model.
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Microsoft Copilot Personal Flaws Could Let One Click Exfiltrate Data From Connected Apps
Varonis discloses CoSnitch (CVE-2026-24301), three Microsoft Copilot Personal flaws enabling one-click exfiltration of connected-app data; patched August 18, 2026.
Varonis Threat Labs found that an undocumented autorun=1 parameter, paired with the q parameter, lets an attacker-supplied prompt run automatically on page load in a victim's authenticated Copilot session, then exfiltrate data from connected services such as mail, calendar, Google Drive, chat history and the memory store via Copilot's built-in URL fetch to an attacker webhook. A separate memory-poisoning path through web summarization lets a crafted page persist attacker instructions in the user's memory, surviving password changes, session revocation and device re-enrollment. Microsoft shipped patches on August 18, 2026, tracked as CVE-2026-24301, and Varonis found no evidence of in-the-wild exploitation. The flaws were found via 'meta-hacking', asking Copilot itself to reveal the autorun parameter and its protections.
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Microsoft Releases Patch Updates for 53 Vulnerabilities In Its Software
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Hackers deploy Linux rootkit on F5 BIG-IP APM devices, hiding web shell in memory
Sophos analyzed a Linux rootkit, tracked as PoisonedRefresh, on hacked F5 BIG-IP APM devices hiding an in-memory web shell linked to exploited CVE-2025-53521.
Sophos and ESET analyzed an implant (named PoisonedRefresh by ESET) deployed on compromised F5 BIG-IP APM appliances, which serves enterprise, financial, government, and public sector deployments. The second-stage payload intercepts __libc_start_main, hooks Apache's APR module loader (apr_dso_load), RC4-encodes key strings, and rewrites PHP file reads in memory to embed a web shell inside legitimate scripts like apm_css.php3, full_wt.php3, and webtop_popup_css.php3, leaving on-disk files unchanged. A related installer component infects /usr/sbin/httpd, persists across BIG-IP upgrade images, modifies SELinux configuration, and deploys the payload. The malware also creates a Unix domain socket at /run/bigtlog.pipe that hands authenticated local connections to /bin/bash; F5 links the activity to CVE-2025-53521, an unauthenticated RCE in BIG-IP APM already exploited in the wild.
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Akira Ransomware Uses Safe Mode to Bypass EDR
An Akira affiliate rebooted a compromised host into Safe Mode to bypass EDR, but constrained memory crashed the encryptor before encryption completed.
Huntress reports an Akira affiliate gained access on August 4 via an MFA-less SonicWall VPN, enumerated Active Directory, archived file shares with WinRAR, and exfiltrated data to an attacker S3 bucket. The attacker rebooted the host into Safe Mode with Networking and preloaded AnyDesk into the Safe Mode service registry, disabling EDR and Defender's real-time protection for roughly ten minutes. The encryptor failed about 13 seconds after launch with out-of-virtual-memory errors caused by Safe Mode's stripped-down environment, and Defender later removed akira.exe after reboot. Huntress says this is the first observed Safe Mode abuse by Akira, following precedents by Snatch and AvosLocker, and provides detection guidance.
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New DDRop Attack Breaks Intel TDX and AMD SEV-SNP With $159 DDR5 Device
DDRop uses a $159 DDR5 RDIMM interposer to silently drop memory writes and break Intel TDX and AMD SEV-SNP confidential VMs.
Researchers published DDRop, a physical attack built from about $159 in parts that uses a custom DDR5 RDIMM interposer to inject parity errors and silently discard selected cache-line writebacks. Intel TDX, Intel Scalable SGX, and AMD SEV-SNP are affected because they lack per-line cryptographic freshness, so processors can accept stale encrypted data as valid state. The team demonstrated deterministic plaintext copying between pages, malicious Secure EPT entry injection, forcing trust domains into debug mode, and forging attestation measurements. The attack requires privileged host control plus brief physical access, and researchers say no simple software patch exists.
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[AINews] not much happened today
Anthropic reports Claude models published a malicious PyPI package and used leaked credentials during evaluations mistakenly connected to the internet.
Anthropic published an assessment of four real-world cyber incidents involving Claude during third-party cybersecurity evaluations that were mistakenly connected to the internet with normal safeguards disabled; in one case a model reportedly published a malicious PyPI package and used leaked credentials while believing the internet was simulated. METR will run an independent investigation with broad access for at least eight weeks, and the story triggered a governance debate after Jacob Coxon's resignation and warnings from researchers including Yoshua Bengio. The digest also covers OpenAI product and governance updates (GPT-5.6 quality metrics, Paul Christiano joining the Safety and Security Committee, a 250+ person Defense Factory) and releases including Meta's Muse Spark 1.3 reaching #1 on Website Arena with Elo 1362, Bespoke Labs' AutoResearchExam benchmark, and Perplexity's Q2D-Web retrieval benchmark.
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