{"id":19824,"date":"2021-05-07T21:54:41","date_gmt":"2021-05-07T19:54:41","guid":{"rendered":"http:\/\/159.69.82.204\/win\/?p=19824"},"modified":"2022-04-14T11:45:22","modified_gmt":"2022-04-14T09:45:22","slug":"poc-fr-den-von-der-nsa-entdeckten-microsoft-exchange-bug-ffentlich","status":"publish","type":"post","link":"https:\/\/borncity.com\/win\/2021\/05\/07\/poc-fr-den-von-der-nsa-entdeckten-microsoft-exchange-bug-ffentlich\/","title":{"rendered":"PoC for Microsoft Exchange bug discovered by NSA public"},"content":{"rendered":"

\"Sicherheit[German<\/a>]Various security vulnerabilities in Microsoft Exchange were discovered by the US intelligence agency NSA and reported to Microsoft. Microsoft closed these vulnerabilities in April 2020 with corresponding updates. As a \"reminder for the weekend\", we would like to point out that a proof of concept (PoC) has been published for these vulnerabilities. So anyone who is not up to date with the latest patch status should take advantage of the weekend.<\/p>\n

<\/p>\n

The NSA vulnerabilities in Microsoft Exchange<\/h2>\n

\"\"Regular blog readers should actually be well informed and have long updated their Microsoft Exchange servers. Because I had pointed out in the blog post PSA: Watch your Exchange Patch status \u2013 0 day vulnerabilities found, is the next Exchange disaster in sight?<\/a> that something was coming for Exchange on April 13, 2021. I was wrong about closed vulnerabilities, bBut on patchday, April 13, 2021, security updates for Microsoft Exchange were released. <\/p>\n

The National Security Agency (NSA) had discovered and reported several RCE vulnerabilities CVE-2021-28480<\/a>, CVE-2021-28481<\/a>, CVE-2021-28482<\/a> and CVE-2021-28483<\/a> in Microsoft Exchange. These very vulnerabilities were closed on patchday, April 13, 2021 (see Exchange Server Security Update KB5001779 (April 13, 2021)<\/a>). I therefore assume that next week Tuesday, on the May 2021 patchday, there could be another security update for Exchange Server. <\/p>\n

There is a proof of concept (PoC) <\/h2>\n

I came across this via the following tweet<\/a> that there seems to be a publicly available proof of concept (PoC) for the vulnerabilities discovered by the NSA in Microsoft Exchange.  <\/p>\n

\"PoC<\/a><\/p>\n

Security researcher Nguyen Jang published a technical description of the ProxyLogon vulnerability CVE-2021-28482 on April 26. The blog pos<\/a>t is in Vietnamese, but should not be a challenge for hackers if they understand the technical details to achieve remote code execution in an authenticated Exchange Server environment. Nguyen Jang also published on GitHub a demo exploit<\/a> written in Python for CVE-2021-28482, and the effectiveness of the PoC code was confirmed by Will Dormann, a vulnerability analyst for CERT\/CC. <\/p>\n

Similar articles:<\/strong>
Exchange isues with ECP\/OWA search after installing security update (March 2021)<\/a>
Exchange Server Security Update KB5001779 (April 13, 2021)<\/a>
PSA: Watch your Exchange Patch status \u2013 0 day vulnerabilities found, is the next Exchange disaster in sight?<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

[German]Various security vulnerabilities in Microsoft Exchange were discovered by the US intelligence agency NSA and reported to Microsoft. Microsoft closed these vulnerabilities in April 2020 with corresponding updates. As a \"reminder for the weekend\", we would like to point out … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[580],"tags":[869,69],"class_list":["post-19824","post","type-post","status-publish","format-standard","hentry","category-security","tag-exchange","tag-security"],"_links":{"self":[{"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/posts\/19824","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/comments?post=19824"}],"version-history":[{"count":0,"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/posts\/19824\/revisions"}],"wp:attachment":[{"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/media?parent=19824"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/categories?post=19824"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/tags?post=19824"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}