{"id":32205,"date":"2019-12-05T16:54:00","date_gmt":"2019-12-05T16:54:00","guid":{"rendered":"https:\/\/packetstormsecurity.com\/news\/view\/30739\/OpenBSD-Patches-Auth-Bypass-Privilege-Escalation-Vulns.html"},"modified":"2019-12-05T16:54:00","modified_gmt":"2019-12-05T16:54:00","slug":"openbsd-patches-auth-bypass-privilege-escalation-vulns","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/openbsd-patches-auth-bypass-privilege-escalation-vulns\/","title":{"rendered":"OpenBSD Patches Auth Bypass, Privilege Escalation Vulns"},"content":{"rendered":"<div><img decoding=\"async\" src=\"https:\/\/zdnet1.cbsistatic.com\/hub\/i\/r\/2019\/12\/05\/05fac7ec-65f9-4ed3-8713-aff8eb905670\/thumbnail\/770x578\/61c63f9d59fda9a93914d403b2e23e76\/screenshot-2019-12-04-at-15-48-41.png\" class=\"ff-og-image-inserted\"><\/div>\n<p>OpenBSD has patched four vulnerabilities including privilege escalation flaws and a remotely exploitable authentication bypass.<\/p>\n<p><a href=\"https:\/\/www.openbsd.org\/\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">OpenBSD<\/a> is an open source Unix operating system based on Berkeley Software Distribution (BSD) and built with security in mind. On Wednesday, Qualys Research Labs revealed the existence of <a href=\"https:\/\/www.qualys.com\/2019\/12\/04\/cve-2019-19521\/authentication-vulnerabilities-openbsd.txt?_ga=2.75852181.122675264.1575541632-949691503.1575541632\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">four vulnerabilities<\/a> in the OS that were first privately reported in the interest of responsible disclosure.&nbsp;<\/p>\n<p>The vulnerabilities have been assigned as CVE-2019-19522, CVE-2019-19521, CVE-2019-19520, and CVE-2019-19519.<\/p>\n<p><strong>See also:&nbsp;<\/strong><a href=\"https:\/\/www.zdnet.com\/article\/new-zealands-gun-buyback-scheme-suffers-data-breach-sap-to-blame\/\" target=\"_blank\" rel=\"noopener noreferrer\">New Zealand&#8217;s gun buyback scheme impacted by data breach, SAP to blame<\/a><\/p>\n<p>The first bug, <a href=\"https:\/\/nvd.nist.gov\/vuln\/detail\/CVE-2019-19522\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">CVE-2019-19522<\/a>, is an authentication bypass issue found in the OpenBSD&#8217;s authentication protocol. The operating system relies on BSD Authentication and if an attacker specifies a particular username, it is possible to force authentication automatically without challenge. The vulnerability is remotely exploitable through smtpd, ldapd, and radiusd.<\/p>\n<p>&#8220;If an attacker specifies a username of the form &#8220;-option&#8221;, they can influence the behavior of the authentication program in unexpected ways,&#8221; the security advisory reads.<\/p>\n<p>The second security flaw, <a href=\"https:\/\/nvd.nist.gov\/vuln\/detail\/CVE-2019-19520\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">CVE-2019-19520<\/a>, is a local privilege escalation problem caused by a failed check in xlock. If an attacker has local access to OpenBSD, they can obtain the privileges of set-group-ID &#8220;auth&#8221; through xlock, which is installed by default.&nbsp;<\/p>\n<section class=\"sharethrough-top\" data-component=\"medusaContentRecommendation\" data-medusa-content-recommendation-options=\"{&quot;promo&quot;:&quot;promo_zd_recommendation_sharethrough_top_in_article_desktop&quot;,&quot;spot&quot;:&quot;dfp-in-article&quot;}\">\n<\/section>\n<p><a href=\"https:\/\/nvd.nist.gov\/vuln\/detail\/CVE-2019-19522\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">CVE-2019-19522<\/a>, the third bug squashed by OpenBSD, is another local privilege escalation problem found in &#8220;S\/Key&#8221; and &#8220;YubiKey&#8221; functions.&nbsp;<\/p>\n<p><strong>CNET:&nbsp;<\/strong><a href=\"https:\/\/www.cnet.com\/news\/tiktok-accused-of-secretly-gathering-user-data-and-sending-it-to-china\/?ftag=CMG-01-10aaa1b\" target=\"_blank\" rel=\"noopener noreferrer\" data-component=\"externalLink\">TikTok accused of secretly gathering user data and sending it to China<\/a><\/p>\n<p>&#8220;If the S\/Key or YubiKey authentication type is enabled (they are both installed by default but disabled), then a local attacker can exploit the privileges of the group &#8220;auth&#8221; to obtain the full privileges of the user &#8220;root&#8221;,&#8221; Qualys says.&nbsp;<\/p>\n<p>To obtain &#8220;auth&#8221; privileges, attackers can first exploit CVE-2019-19520 as part of an attack chain.<\/p>\n<p>The fourth and final vulnerability, <a href=\"https:\/\/nvd.nist.gov\/vuln\/detail\/CVE-2019-19519\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">CVE-2019-19519<\/a>, was found in the &#8220;su&#8221; function. Local attackers can exploit su&#8217;s &#8220;-L&#8221; option &#8212; a software loop which continues until a correct username and password combination is entered &#8212;&nbsp; to log in as themselves, but with a different login class.&nbsp;<\/p>\n<p><strong>TechRepublic:&nbsp;<\/strong><a href=\"https:\/\/www.techrepublic.com\/article\/how-to-protect-computers-that-store-biometric-data-from-malware\/?ftag=CMG-01-10aaa1b\" target=\"_blank\" rel=\"noopener noreferrer\" data-component=\"externalLink\">How to protect computers that store biometric data from malware<\/a><\/p>\n<p>After Qualys reported the security flaws, OpenBSD developers acknowledged the issues and were able to develop and publish patches in less than 40 hours.&nbsp;<\/p>\n<p>The fixes are now available. Users of <a href=\"https:\/\/www.openbsd.org\/errata65.html\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">OpenBSD 6.5<\/a> and <a href=\"https:\/\/www.openbsd.org\/errata66.html\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">OpenBSD 6.6<\/a> should update their builds to stay protected.&nbsp;<\/p>\n<h3>Previous and related coverage<\/h3>\n<hr>\n<p><strong>Have a tip?<\/strong> Get in touch securely via WhatsApp | Signal at +447713 025 499, or over at Keybase: charlie0<\/p>\n<hr>\n<p>READ MORE <a href=\"https:\/\/packetstormsecurity.com\/news\/view\/30739\/OpenBSD-Patches-Auth-Bypass-Privilege-Escalation-Vulns.html\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":32206,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[60],"tags":[8318],"class_list":["post-32205","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-packet-storm","tag-headlineflawbsdpatch"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>OpenBSD Patches Auth Bypass, Privilege Escalation Vulns 2026 | ThreatsHub Cybersecurity News<\/title>\n<meta name=\"description\" content=\"ThreatsHub Cybersecurity News | ThreatsHub.org | Cloud Security &amp; 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 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