memory corruption Archives

Winsage

September 13, 2026

Microsoft reveals why 32-bit Windows was limited to 4GB RAM, and it wasn’t a technical limit

32-bit Windows is commonly thought to be limited to 4GB of RAM due to its 32-bit address space, but this overlooks the role of Physical Address Extension (PAE), which allows access to more than 4GB of RAM on compatible processors. PAE enables 32-bit x86 processors to use 36-bit physical addresses. Windows allocates a 4GB virtual address space to each 32-bit application, with 2GB reserved for the application and 2GB for system use. Windows Server 2003 SP1 Enterprise can support up to 64GB of RAM, while the Datacenter edition can handle 128GB. Microsoft did not extend this capability to consumer editions due to the complexities and potential issues with hardware drivers, which often assume a 32-bit framework. Modifying drivers for PAE can be challenging, as incorrect assumptions about physical and virtual addresses can lead to memory corruption. To mitigate risks, Microsoft capped physical address space at 4GB in Windows XP SP2 and Windows Server 2003 SP1 Standard Edition. Server environments typically have more controlled hardware selections, allowing for the use of drivers that are tested for compatibility with addresses exceeding 4GB. Microsoft began discouraging the production of 32-bit systems in 2020 and ended 32-bit edition production with Windows 11.

Tech Optimizer

September 3, 2026

Prolific Microsoft 0-day hunter drops CrowdStrike Falcon exploit PoC

Nightmare Eclipse, a security researcher known for identifying vulnerabilities in Microsoft products, has shifted focus to other vendors, revealing a zero-day vulnerability called FalconFlank that targets CrowdStrike’s Falcon endpoint security platform. FalconFlank is a privilege escalation vulnerability that exploits the Microsoft Office malicious macros remediation feature within CrowdStrike Falcon. CrowdStrike is investigating the claims and advises customers to disable the Microsoft Office File Suspicious Macro Removal Windows policy setting while assuring them of continued protection through Cloud Anti-malware settings. The exploit works on fully updated Windows 11 25H2 and Windows Server 2025 systems running CrowdStrike Falcon with Optimal Protection enabled. Nightmare Eclipse has also discovered other vulnerabilities, including HardBreacher affecting Kaspersky’s endpoint antivirus and PrettyPrague in Gen Digital’s Avast antivirus, which allows attackers to dump the SAM database. Gen Digital is developing a patch for the Avast vulnerability, while Kaspersky has not commented. Additionally, Nightmare disclosed a memory corruption zero-day vulnerability in Nvidia, named GreenSection, which causes system crashes.

Winsage

July 16, 2026

Windows Netlogon Flaw CVE-2026-41089: CVSS 9.8 [2026]

CVE-2026-41089 is a critical vulnerability in the Windows Netlogon service, rated 9.8 on the CVSS scale, allowing unauthenticated attackers to execute arbitrary code with SYSTEM-level privileges on domain controllers. It affects all supported versions of Windows Server configured as domain controllers, from Windows Server 2012 R2 to the latest release. Microsoft addressed this vulnerability on May 12, 2026, during a broader update that included 138 fixes, but it went largely unnoticed until early June when active exploitation was confirmed. The vulnerability is characterized as a stack-based buffer overflow and is considered "wormable" due to its ability to self-propagate across systems without user intervention. Organizations are advised to patch all domain controllers and audit network access to mitigate exposure.

Winsage

June 10, 2026

Microsoft Defender RoguePlanet Zero-Day Grants SYSTEM Access on Updated Windows

An anonymous researcher known as Chaotic Eclipse has released a proof-of-concept exploit called RoguePlanet, targeting a zero-day vulnerability in Microsoft Defender. The exploit, which is a race condition, has a variable success rate, achieving 100% success on some machines while being less effective on others. When successful, it grants attackers SYSTEM-level privileges on Windows 10 and 11 systems with the June 2026 Patch Tuesday updates. The exploit does not work on Windows Server due to restrictions on mounting ISO images. Chaotic Eclipse has criticized Microsoft's defenses against path redirection attacks and claims to have found multiple vulnerabilities within Defender and other Microsoft software components. The researcher has expressed dissatisfaction with Microsoft's handling of vulnerability disclosures, particularly after losing access to the Microsoft Security Response Center account. Microsoft has condemned the public disclosure of vulnerabilities as unjustifiable, stating it puts customers at unnecessary risk, and has removed Chaotic Eclipse's GitHub and GitLab accounts. Microsoft clarified that it does not intend to pursue legal action against individuals conducting security research but will collaborate with law enforcement against malicious activities.

Tech Optimizer

May 29, 2026

This compact antivirus protection package is now less than £25 — Norton 360 has everything you need to secure your devices against malware, ransomware, and hacking

Norton 360 Standard is currently available for £25, down from its regular price of £70 for the first year. It protects up to three devices from threats like malware and ransomware and includes features such as cloud backup, a VPN, and a password manager. It has a Scam Protection feature that identifies scams in messages and deepfake videos, and an AI Genie for user support. Norton 360 is consistently ranked among the top three antivirus solutions and has received high marks from AV-Comparatives and AV-TEST. It secures internet traffic on public Wi-Fi networks and offers 10GB of cloud backup to protect important files. The deal auto-renews at the standard price after the first year.

Tech Optimizer

May 21, 2026

PostgreSQL Flaws Expose Databases to Remote Code Execution and SQL Injection

PostgreSQL has released versions 18.4, 17.10, 16.14, 15.18, and 14.23 to address 11 security vulnerabilities and over 60 bugs. The vulnerabilities affect PostgreSQL versions 14 through 18 and include issues such as remote code execution, SQL injection, and denial-of-service risks. Specific vulnerabilities include: - CVE-2026-6472: Missing authorization in CREATE TYPE allows query hijacking. - CVE-2026-6473: Integer wraparound leads to out-of-bounds writes and server crashes. - CVE-2026-6474: Format string issue leaks server memory. - CVE-2026-6475: Symlink attack allows overwriting arbitrary files. - CVE-2026-6476: SQL injection allows execution of arbitrary SQL as superuser. - CVE-2026-6477: Memory buffer overwrite via libpq lo_* functions. - CVE-2026-6478: Timing attack exposes MD5-hashed passwords. - CVE-2026-6479: SSL/GSS recursion flaw allows denial-of-service. - CVE-2026-6575: Buffer over-read leaks memory data (PostgreSQL 18 only). - CVE-2026-6637: Refint module enables stack overflow and SQL injection, leading to possible RCE. - CVE-2026-6638: SQL injection in REFRESH PUBLICATION via table names. Organizations are advised to upgrade to the latest versions, avoid MD5 password authentication, restrict privileges, audit extensions, and monitor for abnormal activity. PostgreSQL 14 will reach its end-of-life on November 12, 2026.

Tech Optimizer

May 20, 2026

Critical PostgreSQL Flaws Enable Code Execution and SQL Injection

On May 14, 2026, PostgreSQL released critical security updates for versions 18.4, 17.10, 16.14, 15.18, and 14.23, addressing 11 Common Vulnerabilities and Exposures (CVEs) related to stack buffer overflows, SQL injection, memory disclosure, and denial-of-service vulnerabilities. The most critical vulnerability, CVE-2026-6637, has a CVSS score of 8.8 and allows remote, unprivileged database users to execute arbitrary code. Other notable vulnerabilities include CVE-2026-6473, which affects memory allocation leading to potential memory corruption, and CVE-2026-6475, which allows overwriting sensitive OS-level files. Additional vulnerabilities include SQL injection flaws and authentication issues, with various CVSS scores ranging from 3.7 to 7.5. The updates can be implemented without a database dump, and PostgreSQL 14 will reach its end-of-life on November 12, 2026.

Tech Optimizer

May 20, 2026

PoC Exploit Released for 20-Year Old PostgreSQL RCE Vulnerability

A proof-of-concept exploit has been developed for CVE-2026-2005, a remote code execution vulnerability in the pgcrypto extension of PostgreSQL. This vulnerability, stemming from legacy code, allows attackers to trigger a heap-based buffer overflow through specially crafted PGP messages, enabling arbitrary memory read and write operations. Successful exploitation can escalate privileges to PostgreSQL superuser status and execute commands on the operating system. The exploit targets PostgreSQL instances compiled from a specific vulnerable commit and circumvents protections like Address Space Layout Randomization (ASLR). It involves corrupting heap memory structures, leading to a controlled pointer leak that reveals the heap layout. Security researcher Varik Matevosyan has published the PoC on GitHub, demonstrating the exploitation process. The exploit requires a compatible PostgreSQL binary and utilizes Python-based tools for interaction. Organizations are advised to review their PostgreSQL deployments, disable unnecessary extensions, and apply security updates to mitigate risks.

Tech Optimizer

May 19, 2026

Critical PostgreSQL Vulnerabilities Enables Code Execution and SQL Injections

The PostgreSQL Global Development Group has released security updates for versions 18.4, 17.10, 16.14, 15.18, and 14.23, addressing 11 vulnerabilities, including critical issues related to arbitrary code execution and SQL injection flaws. All supported branches from 14 through 18 are affected by vulnerabilities, necessitating updates. Database administrators can perform in-place upgrades without needing a dump/restore. Key vulnerabilities include: - CVE-2026-6637: Stack buffer overflow in the refint module allowing arbitrary code execution. - CVE-2026-6472: Privilege bypass and arbitrary SQL execution. - CVE-2026-6473: Potential remote code execution and memory corruption. - CVE-2026-6474: Server memory information leak. - CVE-2026-6475: Arbitrary file overwrite vulnerability. - CVE-2026-6476: SQL injection with superuser execution. - CVE-2026-6477: Client-side code execution risk. - CVE-2026-6478: MD5 credential timing leak. - CVE-2026-6479: SSL/GSS denial-of-service flaw. - CVE-2026-6575: Limited memory disclosure issue. - CVE-2026-6638: SQL injection in logical replication. Organizations using PostgreSQL 14 should upgrade to version 14.23 and plan migration to a newer version before the end-of-life on November 12, 2026. The updates are urgent for deployments exposed to the internet or in multi-tenant environments.

Winsage

April 27, 2026

Using Windows or Microsoft Office? India issues high-severity cyber alert, how to stay safe

India’s cybersecurity agency, CERT-In, has issued an advisory regarding high-severity vulnerabilities in various Microsoft products, including multiple versions of Windows, Windows Server, Microsoft Office, and the Chromium-based Microsoft Edge browser. These vulnerabilities can allow attackers to execute malicious code, elevate system privileges, access sensitive data, or disrupt services. They arise from issues such as improper input validation, memory corruption, insufficient access control, and inadequate memory object handling. Exploitation can occur remotely or locally, sometimes requiring user interaction. CERT-In advises users and organizations to apply the latest security updates from Microsoft to mitigate these risks.