{"id":251441,"date":"2021-03-25T10:54:50","date_gmt":"2021-03-25T09:54:50","guid":{"rendered":"https:\/\/www.borncity.com\/blog\/?p=251441"},"modified":"2022-05-14T10:05:58","modified_gmt":"2022-05-14T08:05:58","slug":"schwachstelle-in-openssl-update-kommt-am-25-3-2021","status":"publish","type":"post","link":"https:\/\/borncity.com\/blog\/2021\/03\/25\/schwachstelle-in-openssl-update-kommt-am-25-3-2021\/","title":{"rendered":"Schwachstelle in OpenSSL &#8211; Update kommt am 25.3.2021"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" style=\"float: left; margin: 0px 10px 0px 0px; display: inline;\" src=\"https:\/\/borncity.com\/blog\/wp-content\/uploads\/2015\/01\/Schutz.jpg\" width=\"40\" height=\"47\" align=\"left\" \/>[English]In der Software OpenSSL gibt es wohl Schwachstellen (\u00fcber Seitenkanalangriffe), die die Sicherheit der Verbindungen tangiert. Details sind noch unbekannt, aber das OpenSSL-Team will am heutigen Donnerstag (25.3.2021) ein Sicherheitsupdate ver\u00f6ffentlichen.<\/p>\n<p><!--more--><\/p>\n<p>Blog-Leser Mario hat <a href=\"https:\/\/borncity.com\/blog\/2021\/03\/24\/schweizer-impfplattform-mit-schweren-sicherheitsmngeln\/#comment-103656\" target=\"_blank\" rel=\"noopener\">diesen Kommentar<\/a> im Blog hinterlassen, der aktuell auf das Thema hinweist (danke). Netzwoche <a href=\"https:\/\/www.netzwoche.ch\/news\/2021-03-24\/openssl-bringt-update-aufgrund-eines-hohen-sicherheitsrisikos\" target=\"_blank\" rel=\"noopener\">berichtete hier<\/a> vorab \u00fcber das Thema. Das Projektteam hinter dem Open-Source-Zugriffsprotokoll <a href=\"https:\/\/web.archive.org\/web\/20220427003935\/https:\/\/www.openssl.org\/policies\/secpolicy.html\" target=\"_blank\" rel=\"noopener\">k\u00fcndigte ein Sicherheitsupdate<\/a> an. Die Entwickler halten OpenSSL als nicht f\u00fcr sicher gegen die folgenden Klassen von Angriffen:<\/p>\n<ul>\n<li>same physical system side channel<\/li>\n<li>CPU\/hardware flaws<\/li>\n<li>physical fault injection<\/li>\n<li>physical observation side channels (e.g. power consumption, EM emissions, etc)<\/li>\n<\/ul>\n<p>Es gibt wohl das Risiko von Seitenkanal-Angriffen, die die Entwickler untersucht haben. Meine Lesart ist, dass man daran arbeitet, diese Art Angriffe zu erschweren. Sobald Details vorliegen, werde ich diese nachtragen.<\/p>\n<h2>Erg\u00e4nzung: Fix der Schwachstelle VE-2021-3450<\/h2>\n<p>Wie bereits im Kommentar erw\u00e4hnt, ist zum 25. M\u00e4rz 2021 Sicherheitshinweis zu\u00a0<a href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2021-3450\" target=\"_blank\" rel=\"noopener\" name=\"CVE-2021-3450\">CVE-2021-3450<\/a> erschienen. Das <a href=\"https:\/\/www.openssl.org\/news\/secadv\/20210325.txt\" target=\"_blank\" rel=\"noopener\">OpenSSL advisory<\/a> vom 26. M\u00e4rz 2021 wird als hoch eingestuft:<\/p>\n<blockquote><p>The X509_V_FLAG_X509_STRICT flag enables additional security checks of the certificates present in a certificate chain. It is not set by default. Starting from OpenSSL version 1.1.1h a check to disallow certificates in the chain that have explicitly encoded elliptic curve parameters was added as an additional strict check. An error in the implementation of this check meant that the result of a previous check to confirm that certificates in the chain are valid CA certificates was overwritten. This effectively bypasses the check that non-CA certificates must not be able to issue other certificates. If a \"purpose\" has been configured then there is a subsequent opportunity for checks that the certificate is a valid CA. All of the named \"purpose\" values implemented in libcrypto perform this check. Therefore, where a purpose is set the certificate chain will still be rejected even when the strict flag has been used. A purpose is set by default in libssl client and server certificate verification routines, but it can be overridden or removed by an application. In order to be affected, an application must explicitly set the X509_V_FLAG_X509_STRICT verification flag and either not set a purpose for the certificate verification or, in the case of TLS client or server applications, override the default purpose. OpenSSL versions 1.1.1h and newer are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1k. OpenSSL 1.0.2 is not impacted by this issue. Reported by Benjamin Kaduk (Akamai), Xiang Ding (Akamai), others at Akamai.<\/p><\/blockquote>\n<p>Die Schw\u00e4che in der Verschl\u00fcsselung wurde in OpenSSL 1.1.1k <a href=\"https:\/\/github.com\/openssl\/openssl\/commit\/2a40b7bc7b94dd7de897a74571e7024f0cf0d63b\">(git commit)<\/a> (betrifft Version 1.1.1h-1.1.1j) behoben.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>[English]In der Software OpenSSL gibt es wohl Schwachstellen (\u00fcber Seitenkanalangriffe), die die Sicherheit der Verbindungen tangiert. Details sind noch unbekannt, aber das OpenSSL-Team will am heutigen Donnerstag (25.3.2021) ein Sicherheitsupdate ver\u00f6ffentlichen.<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[426,7459,185],"tags":[3335,4328,4315],"class_list":["post-251441","post","type-post","status-publish","format-standard","hentry","category-sicherheit","category-software","category-update","tag-openssl","tag-sicherheit","tag-update"],"_links":{"self":[{"href":"https:\/\/borncity.com\/blog\/wp-json\/wp\/v2\/posts\/251441","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/borncity.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/borncity.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/borncity.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/borncity.com\/blog\/wp-json\/wp\/v2\/comments?post=251441"}],"version-history":[{"count":0,"href":"https:\/\/borncity.com\/blog\/wp-json\/wp\/v2\/posts\/251441\/revisions"}],"wp:attachment":[{"href":"https:\/\/borncity.com\/blog\/wp-json\/wp\/v2\/media?parent=251441"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/borncity.com\/blog\/wp-json\/wp\/v2\/categories?post=251441"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/borncity.com\/blog\/wp-json\/wp\/v2\/tags?post=251441"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}