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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.4161 MFSA 2021-54 Security Vulnerabilities fixed in Thunderbird 91.4.0 8 December 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Thunderbird Publisher: Mozilla Operating System: Windows UNIX variants (UNIX, Linux, OSX) Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction Cross-site Scripting -- Remote with User Interaction Denial of Service -- Remote with User Interaction Provide Misleading Information -- Remote with User Interaction Access Confidential Data -- Remote with User Interaction Reduced Security -- Remote with User Interaction Resolution: Patch/Upgrade CVE Names: CVE-2021-43546 CVE-2021-43545 CVE-2021-43543 CVE-2021-43542 CVE-2021-43541 CVE-2021-43539 CVE-2021-43538 CVE-2021-43537 CVE-2021-43536 CVE-2021-43528 Reference: ESB-2021.4160 Original Bulletin: https://www.mozilla.org/en-US/security/advisories/mfsa2021-54/ - --------------------------BEGIN INCLUDED TEXT-------------------- Mozilla Foundation Security Advisory 2021-54 Security Vulnerabilities fixed in Thunderbird 91.4.0 Announced: December 7, 2021 Impact: high Products: Thunderbird Fixed in: Thunderbird 91.4 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. # CVE-2021-43536: URL leakage when navigating while executing asynchronous function Reporter: Sunwoo Kim and Youngmin Kim of SNU CompSec Lab Impact: high Description Under certain circumstances, asynchronous functions could have caused a navigation to fail but expose the target URL. References o Bug 1730120 # CVE-2021-43537: Heap buffer overflow when using structured clone Reporter: bo13oy of Cyber Kunlun Lab Impact: high Description An incorrect type conversion of sizes from 64bit to 32bit integers allowed an attacker to corrupt memory leading to a potentially exploitable crash. References o Bug 1738237 # CVE-2021-43538: Missing fullscreen and pointer lock notification when requesting both Reporter: Irvan Kurniawan (@sourc7) Impact: high Description By misusing a race in our notification code, an attacker could have forcefully hidden the notification for pages that had received full screen and pointer lock access, which could have been used for spoofing attacks. References o Bug 1739091 # CVE-2021-43539: GC rooting failure when calling wasm instance methods Reporter: Asumu Takikawa and Ioanna Dimitriou Impact: high Description Failure to correctly record the location of live pointers across wasm instance calls resulted in a GC occurring within the call not tracing those live pointers. This could have led to a use-after-free causing a potentially exploitable crash. References o Bug 1739683 # CVE-2021-43541: External protocol handler parameters were unescaped Reporter: chriscla Impact: moderate Description When invoking protocol handlers for external protocols, a supplied parameter URL containing spaces was not properly escaped. References o Bug 1696685 # CVE-2021-43542: XMLHttpRequest error codes could have leaked the existence of an external protocol handler Reporter: Raphael Smolik Impact: moderate Description Using XMLHttpRequest, an attacker could have identified installed applications by probing error messages for loading external protocols. References o Bug 1723281 # CVE-2021-43543: Bypass of CSP sandbox directive when embedding Reporter: Armin Ebert Impact: moderate Description Documents loaded with the CSP sandbox directive could have escaped the sandbox's script restriction by embedding additional content. References o Bug 1738418 # CVE-2021-43545: Denial of Service when using the Location API in a loop Reporter: Paul Zuhlcke Impact: low Description Using the Location API in a loop could have caused severe application hangs and crashes. References o Bug 1720926 # CVE-2021-43546: Cursor spoofing could overlay user interface when native cursor is zoomed Reporter: Daniel Veditz Impact: low Description It was possible to recreate previous cursor spoofing attacks against users with a zoomed native cursor. References o Bug 1737751 # CVE-2021-43528: JavaScript unexpectedly enabled for the composition area Reporter: Pedro Batista Impact: low Description Thunderbird unexpectedly enabled JavaScript in the composition area. The JavaScript execution context was limited to this area and did not receive chrome-level privileges, but could be used as a stepping stone to further an attack with other vulnerabilities. References o Bug 1742579 #MOZ-2021-0009: Memory safety bugs fixed in Thunderbird 91.4.0 Reporter: Mozilla developers and community Impact: high Description Mozilla developers and community members Julian Hector, Randell Jesup, Gabriele Svelto, Tyson Smith, Christian Holler, and Masayuki Nakano reported memory safety bugs present in Thunderbird 91.3. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. References o Memory safety bugs fixed in Thunderbird 91.4.0 - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBYbALiuNLKJtyKPYoAQh/Gw/7BnIlYFc3ggI+n9UOifgMf75+LZupyl89 mGeaVfTgfDOvEDOFgb2sXNpXqCViHUVIxA/gv3eac6QTNcaLs8wwsuuO0tLQD/3P 6OT+nnrpfyrbXDHUhKfLBreM5lLGvpY4Iu5WRf/7P/SADODy8EMDvTjsrxcvI6IQ xSut2wOoVNwPveqP3lbS+Ir1Yy8NScfiWw62hFEedwr44BNVrlQCa0+GGN6idhWs RUwlefEwb+9b8UDONGwBO3MtwRMeFaUzQcIlPw9HTDZnUEMulDq32MA+XCFrUWql aO0VPwWCozj14nmk1lAWwdPLIijfCgejBn8QVjsiJAXJ6yxi4f6PZzylgSF1YMjY gcWZZ6yg6ozpCr65hwwOZOeX5foV63iBF6dA36KSrP0GC+XLe/266e0WRxR2F4p0 oSe/au822FGVIMUwz8PQZCoo9ocKUudB9hu2hy/JvwIUGiUnGj2pfcKB+y3ZyRzP UEJybztFoZOpbEqkaUEBnHYLOhxwqi8Bt3DxZ0889Z2CmcGhkGlQsO50sJWDq09x EQ1f/tHD/CT911dj/yARwG22GONTN9RlCBpXKKthfJx5TDD25YFckAq52UvJM7Fq sLuCKr5kItC/SetF1cDLMXAWXcnu0GfCGWubpxqxhZhHmuIZVhGBhopJ4vsGhXp+ 2walrv4qqvE= =lF6Q -----END PGP SIGNATURE-----