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Multiple Vulnerabilities in Mozilla Thunderbird Could Allow for Arbitrary Code Execution

MS-ISAC ADVISORY NUMBER:

2019-094

DATE(S) ISSUED:

09/16/2019

OVERVIEW:

Multiple vulnerabilities have been identified in Mozilla Thunderbird, the most severe of which could allow for arbitrary code execution. Mozilla Thunderbird is an email client. Successful exploitation of the most severe of these vulnerabilities could allow for arbitrary code execution. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights.

THREAT INTELLIGENCE:

There are currently no reports of these vulnerabilities being exploited in the wild.

SYSTEMS AFFECTED:

  • Mozilla Thunderbird versions prior to 60.9
  • Mozilla Thunderbird versions prior to 68.1

RISK:

Government:
  • Large and medium government entities: HIGH
  • Small government entities: MEDIUM
Businesses:
  • Large and medium business entities: HIGH
  • Small business entities: MEDIUM
Home Users:
LOW

TECHNICAL SUMMARY:

Multiple vulnerabilities have been identified in Mozilla Thunderbird, the most severe of which could allow for arbitrary code execution. In general, these flaws cannot be exploited through email in the Thunderbird product because scripting is disabled when reading mail, but are potentially risks in browser or browser-like contexts. Details of the vulnerabilities are as follows:

  • Navigation events were not fully adhering to the W3C's "Navigation-Timing Level 2" draft specification in some instances for the unload event, which restricts access to detailed timing attributes to only be same-origin. This resulted in potential cross-origin information exposure of history through timing side-channel attacks. (CVE-2019-11743)
  • Encrypted S/MIME parts in a crafted multipart/alternative message can leak plaintext when included in a HTML reply/forward. (CVE-2019-11739)
  • A memory safety bug that could allow for memory corruption. This could be exploited to run arbitrary code. (2019-11740)
  • A use-after-free vulnerability can occur while manipulating video elements if the body is freed while still in use. This results in a potentially exploitable crash. (CVE-2019-11746)
  • Some HTML elements, such as and <textarea>, can contain literal angle brackets without treating them as markup. It is possible to pass a literal closing tag to .innerHTML on these elements, and subsequent content after that will be parsed as if it were outside the tag. This can lead to XSS if a site does not filter user input as strictly for these elements as it does for other elements. (CVE-2019-11744)</li><li>A same-origin policy violation occurs allowing the theft of cross-origin images through a combination of SVG filters and a <canvas> element due to an error in how same-origin policy is applied to cached image content. The resulting same-origin policy violation could allow for data theft. (CVE-2019-11742)</li><li>It is possible to delete an IndexedDB key value and subsequently try to extract it during conversion. This results in a use-after-free and a potentially exploitable crash. (CVE-2019-11752)</li></ul><p>Successful exploitation of the most severe of these vulnerabilities could allow for arbitrary code execution. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights.</p> </p> <h4>RECOMMENDATIONS:</h4> <p> <p>We recommend the following actions be taken: </p> <ul> <li>Apply appropriate updates provided by Mozilla to vulnerable systems, immediately after appropriate testing.</li> <li>Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.</li> <li>Remind users not to visit un-trusted websites or follow links provided by unknown or un-trusted sources.</li> <li>Inform and educate users regarding the threats posed by hypertext links contained in emails or attachments especially from un-trusted sources.</li> <li>Apply the Principle of Least Privilege to all systems and services.</li> </ul> </p> <h4>REFERENCES:</h4> <div class="reference-list"> <h5>Mozilla:</h5> <a href="https://www.mozilla.org/en-US/security/advisories/mfsa2019-30/" target="_blank">https://www.mozilla.org/en-US/security/advisories/mfsa2019-30/</a> <a href="https://www.mozilla.org/en-US/security/advisories/mfsa2019-29/" target="_blank">https://www.mozilla.org/en-US/security/advisories/mfsa2019-29/</a> </div> <div class="reference-list"> <h5>CVE:</h5> <a href="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11739" target="_blank">http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11739</a> <a href="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11740" target="_blank">http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11740</a> <a href="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11742" target="_blank">http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11742</a> <a href="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11743" target="_blank">http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11743</a> <a href="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11744" target="_blank">http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11744</a> <a href="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11746" target="_blank">http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11746</a> <a href="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11752" target="_blank">http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11752</a> </div> <!-- left column content end --> </div> <!-- EOF: LEFT COLUMN --> <!--<div style="font-size: 0.85em; color: gray">* NOTICE: Temporary disable read content from WP and generate it dynamically from API</div>--> <!-- RIGHT COLUMN --> <div class="col-lg-3 col-md-4 col-sm-12 template-sidebar"> <div class="template-sidebar-content"> <h4>Get Email Updates When Cyber Threats Like This Arise</h4> <a href="https://learn.cisecurity.org/ms-isac-subscription" class="btn btn-sm btn-sidebar green-background"> <img 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