{"id":15085,"date":"2018-10-05T13:26:04","date_gmt":"2018-10-05T13:26:04","guid":{"rendered":"https:\/\/packetstormsecurity.com\/news\/view\/29383\/Mozilla-Resolves-Critical-Code-Execution-Flaw-In-Thunderbird.html"},"modified":"2018-10-05T13:26:04","modified_gmt":"2018-10-05T13:26:04","slug":"mozilla-resolves-critical-code-execution-flaw-in-thunderbird","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/mozilla-resolves-critical-code-execution-flaw-in-thunderbird\/","title":{"rendered":"Mozilla Resolves Critical Code Execution Flaw In Thunderbird"},"content":{"rendered":"<div><img decoding=\"async\" src=\"https:\/\/zdnet4.cbsistatic.com\/hub\/i\/r\/2018\/10\/05\/9559f883-b2b4-4395-8dbe-9b76069d1355\/thumbnail\/770x578\/8453022f9163388b87413bc98da67f0e\/screen-shot-2018-10-05-at-09-37-33.png\" class=\"ff-og-image-inserted\"\/><\/div>\n<p>Mozilla has resolved a critical vulnerability in the Thunderbird email client which could lead to the execution of arbitrary code by attackers.<\/p>\n<p>The security flaw, <a href=\"https:\/\/nvd.nist.gov\/vuln\/detail\/CVE-2018-12376\" target=\"_blank\" rel=\"noopener noreferrer\">CVE-2018-12376<\/a>, is a memory corruption issue that &#8220;with enough effort&#8221; could be exploited in order to run arbitrary code, according to Mozilla&#8217;s <a href=\"https:\/\/www.mozilla.org\/en-US\/security\/advisories\/mfsa2018-25\/\" target=\"_blank\" rel=\"noopener noreferrer\">security advisory<\/a>.<\/p>\n<p>The resolution of the vulnerability is part of the Thunderbird version 60.2.1 update, which also tackled two high-risk bugs, three vulnerabilities issued with a moderate risk rating, and one low-level security flaw.<\/p>\n<p>The first high-risk vulnerability, <a href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2018-12377\" target=\"_blank\" rel=\"noopener noreferrer\">CVE-2018-12377<\/a> is a use-after-free bug found in Thunderbird&#8217;s refresh driver timers. If the timer is deleted at the same time refresh drivers are being refreshed during shut down, this can cause the email client to crash.<\/p>\n<p><strong>See also: <a href=\"https:\/\/www.zdnet.com\/article\/mozilla-rolls-out-recovery-key-option-for-firefox-accounts\/\">Mozilla rolls out recovery key option for Firefox accounts<\/a><\/strong><\/p>\n<p>The second dangerous bug which has been resolved in the update is <a href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2018-12378\" target=\"_blank\" rel=\"noopener noreferrer\">CVE-2018-12378<\/a>, another use-after-free bug which occurs when &#8220;an IndexedDB index is deleted while still in use by JavaScript code that is providing payload values to be stored.&#8221; This, too, can result in an exploitable crash.<\/p>\n<p><strong>CNET: <a href=\"https:\/\/www.cnet.com\/news\/mozilla-gives-firefox-focus-a-browser-brain-transplant-on-android\/\" target=\"_blank\" rel=\"noopener noreferrer\">Mozilla gives Firefox Focus a browser brain transplant on Android<\/a><\/strong><\/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>Three moderate vulnerabilities, <a href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2018-12379\" target=\"_blank\" rel=\"noopener noreferrer\">CVE-2018-12379<\/a>, <a href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2017-16541\" target=\"_blank\" rel=\"noopener noreferrer\">CVE-2017-16541<\/a>, and <a href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2018-12385\" target=\"_blank\" rel=\"noopener noreferrer\">CVE-2018-12385<\/a> have all also been patched.<\/p>\n<p>The first is an out-of bounds write issue caused by opening malicious MAR files leading to a Thunderbird crash; while the second is a proxy bypass circumvention issue present in automount features.<\/p>\n<p>The third vulnerability is a data cache issue present in the TransportSecurityInfo facility which, if exploited, can trigger a startup crash for Thunderbird users switching between the Nightly and Release versions of Firefox when the same profile is in use.<\/p>\n<p>The last problem resolved in this update is <a href=\"https:\/\/nvd.nist.gov\/vuln\/detail\/CVE-2018-12383\" target=\"_blank\" rel=\"noopener noreferrer\">CVE-2018-12383<\/a>, a low-risk bug which may, in some contexts, expose unencrypted copies of passwords.<\/p>\n<p><strong>TechRepublic: <a href=\"https:\/\/www.techrepublic.com\/article\/how-to-use-firefoxs-aboutconfig\/\" target=\"_blank\" rel=\"noopener noreferrer\">How to use Firefox&#8217;s about:config<\/a><\/strong><\/p>\n<p>&#8220;If a user saved passwords before Firefox 58 and then later set a master password, an unencrypted copy of these passwords is still accessible,&#8221; Mozilla says. &#8220;This is because the older stored password file was not deleted when the data was copied to a new format starting in Firefox 58. The new master password is added only on the new file. This could allow the exposure of stored password data outside of user expectations.&#8221;<\/p>\n<p>Mozilla notes that in general, Thunderbird users most likely won&#8217;t be affected by these vulnerabilities as scripting is disabled when reading mail; however, there is still some danger in relation to browser contexts.<\/p>\n<p>As a result, Thunderbird users should consider updating their software builds immediately.<\/p>\n<h3>Previous and related coverage<\/h3>\n<p>READ MORE <a href=\"https:\/\/packetstormsecurity.com\/news\/view\/29383\/Mozilla-Resolves-Critical-Code-Execution-Flaw-In-Thunderbird.html\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":15086,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[60],"tags":[3834],"class_list":["post-15085","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-packet-storm","tag-headlineemailflawpatchmozilla"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Mozilla Resolves Critical Code Execution Flaw In Thunderbird 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\" 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