{"id":39884,"date":"2021-03-04T15:27:32","date_gmt":"2021-03-04T15:27:32","guid":{"rendered":"https:\/\/packetstormsecurity.com\/news\/view\/32077\/Researcher-Finds-5-Privilege-Escalation-Vulns-In-Linux-Kernel.html"},"modified":"2021-03-04T15:27:32","modified_gmt":"2021-03-04T15:27:32","slug":"researcher-finds-5-privilege-escalation-vulns-in-linux-kernel","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/researcher-finds-5-privilege-escalation-vulns-in-linux-kernel\/","title":{"rendered":"Researcher Finds 5 Privilege Escalation Vulns In Linux Kernel"},"content":{"rendered":"
\n
Oracle Co-Founder Larry Ellison delivers a keynote address at the Oracle OpenWorld conference in 2006. A researcher found five similar vulnerabilities in the kernel of Linux operating systems that can allow an attacker to escalate local privileges on a victim\u2019s network. (Justin Sullivan\/Getty Images)<\/figcaption><\/figure>\n

A researcher at Positive Technologies found five similar vulnerabilities in the kernel of Linux operating systems that can allow an attacker to escalate local privileges on a victim\u2019s network.<\/p>\n

The flaws, discovered by security researcher Alexander Popov, could allow an attacker to potentially steal data, run administrative commands or install malware on operating systems or server applications. Popov was able to successfully test an exploit of one of the vulnerabilities on Fedora Server 33, notifying the Linux Foundation<\/a>, a non-profit consortium designed to standardize support for the open-source Linux system, and other parties through email<\/a> on February 5.<\/p>\n

\u201cHello! Let me inform you about the Linux kernel vulnerabilities that I\u2019ve found in AF_VSOCK implementation. I managed to exploit one of them for a local privilege escalation on Fedora Server 33 for x86_64, bypassing SMEP and SMAP,\u201d Popov wrote to the group, adding he planned to share more details about the exploit techniques with them \u201clater.\u201d  <\/p>\n

Popov said in the email that he had already developed a patch and followed responsible disclosure guidelines throughout the process. He submitted his findings to the National Institute of Standards and Technologies\u2019 National Vulnerability Database, which developed them into CVE-2021-26708<\/a>.<\/p>\n

The vulnerabilities received a 7.0 out of 10 for severity by the Common Vulnerability Scoring System. According to Popov, the vulnerable kernel modules are race conditions that are present in all major GNU\/Linux distributions and automatically load when creating a socket through the AF_VSOCK core, which is designed<\/a> to communicate between guest virtual machines and their host.<\/p>\n

Privilege escalation vulnerabilities are considered particularly dangerous because of the level of control it can give an attacker within a victim network.  In a recent report<\/a> on vulnerabilities tied to ransomware operations, RiskSense classifies privilege escalation alongside remote code execution as the two types of vulnerabilities that \u201csignificantly increases risk to an organization.\u201d<\/p>\n

They also found that such vulnerabilities are becoming increasingly popular among cybercriminals and security researchers, with more than 25% of newly published Common Vulnerabilities and Exposure (CVE) records this past year containing some component of privilege escalation or remote code execution.<\/p>\n

Popov has found at least two other privilege escalation vulnerabilities in Linux kernels, CVE-2019-18683<\/a> in 2019 and CVE-2017-2636<\/a> in 2017.   <\/p>\n<\/p><\/div>\n

\n

Topics:<\/h2>\n

Patch management<\/a> Threat intelligence<\/a> Vulnerability Management<\/a> <\/section>\n

READ MORE HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

READ MORE HERE…<\/p>\n","protected":false},"author":2,"featured_media":39885,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[60],"tags":[3707],"class_list":["post-39884","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-packet-storm","tag-headlinelinuxflaw"],"yoast_head":"\nResearcher Finds 5 Privilege Escalation Vulns In Linux Kernel 2026 | ThreatsHub Cybersecurity News<\/title>\n<meta name=\"description\" content=\"ThreatsHub Cybersecurity News | ThreatsHub.org | Cloud Security & Cyber Threats Analysis Hub. 100% Free OSINT Threat Intelligent and Cybersecurity News.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.threatshub.org\/blog\/researcher-finds-5-privilege-escalation-vulns-in-linux-kernel\/\" 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