{"uuid": "1870e130-5c6c-4dff-ad94-2abb70339710", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-31199", "type": "seen", "source": "https://t.me/hacking_Attack/12056", "content": "vulnerability in Chrome and Chromium browsers that allows attackers to exploit the Chrome renderer process (the processes that are responsible for what happens inside users\u2019 tabs).\nKaspersky experts did find and analyze the second exploit, however: An elevation of privilege exploit that exploits two distinct vulnerabilities in the Microsoft Windows OS kernel: CVE-2021-31955 and CVE-2021-31956. The CVE-2021-31955 bug \u201cis affiliated with SuperFetch, a feature first introduced in Windows Vista that aims to reduce software loading times by pre-loading commonly used applications into memory,\u201d they explained.\n\nThe second flaw, CVE-2021-31956, is an Elevation of Privilege vulnerability and heap-based buffer overflow. Kaspersky said that attackers used this vulnerability alongside Windows Notification Facility (WNF) \u201cto create arbitrary memory read/write primitives and execute malware modules with system privileges.\u201d\n\n\u201cOnce the attackers have used both the Chrome and Windows exploits to gain a foothold in the targeted system, the stager module downloads and executes a more complex malware dropper from a remote server,\u201d they continued. \u201cThis dropper then installs two executables, which pretend to be legitimate files belonging to Microsoft Windows OS. The second of these two executables is a remote shell module, which is able to download and upload files, create processes, sleep for certain periods of time, and delete itself from the infected system.\u201d\n\nBoris Larin, senior security researcher with Kaspersky\u2019s Global Research and Analysis Team (GReAT), said that the team hasn\u2019t been able to link these highly targeted attacks to any known threat actor: Hence the name PuzzleMaker and the determination to closely monitor the security landscape \u201cfor future activity or new insights about this group,\u201d he was quoted as saying in the press release.\n\nIf the current trend is any indication, expect to see more of the same, Larin said. \u201cOverall, of late, we\u2019ve been seeing several waves of high-profile threat activity being driven by zero-day exploits,\u201d he said. \u201cIt\u2019s a reminder that zero days continue to be the most effective method for infecting targets. Now that these vulnerabilities have been made publicly known, it\u2019s possible that we\u2019ll see an increase of their usage in attacks by this and other threat actors. That means it\u2019s very important for users to download the latest patch from Microsoft as soon as possible.\u201d CVE-2021-31199/CVE-2021-31201The two Enhanced Cryptographic Provider Elevation of Privilege vulnerabilities are linked to the Adobe Reader bug that came under active attack\u00a0last month (CVE-2021-28550), ZDI explained. \u201cIt\u2019s common to see privilege escalation paired with code execution bugs, and it seems these two vulnerabilities were the privilege escalation part of those exploits,\u201d he explained. \u201cIt is a bit unusual to see a delay between patch availability between the different parts of an active attack, but good to see these holes now getting closed.\u201d CVE-2021-33739Breen noted that privilege escalation vulnerabilities such as this one in the Microsoft DWM Core Library are just as valuable to attackers as RCEs. \u201cOnce they have gained an initial foothold, they can move laterally across the network and uncover further ways to escalate to system or domain-level access,\u201d he said. \u201cThis can be hugely damaging in the event of ransomware attacks, where high privileges can enable the attackers to stop or destroy backups and other security tools.\u201d\nSource: threatpost.com (Click Link)Recent News* https://www.blackhatethicalhacking.com/wp-content/uploads/2021/06/Untitled-design-1-1-90x90.png RockYou2021: largest password compilation of all time leaked online \u2013 8.4 billion entries17 hours ago\n* https://www.blackhatethicalhacking.com/wp-content/uploads/2021/06/microsoft-exploit-90x90.jpg Windows Container Malware Targets Kubernetes Clusters1 day ago\n* https://www.blackhatethicalhacking[...]\n\n___________________________ \n@hacking_Attack\n@Hacking_Video", "creation_timestamp": "2026-09-02T01:03:13.285957Z"}