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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.0292 MFSA 2021-05 Security Vulnerabilities fixed in Thunderbird 78.7 27 January 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Thunderbird Publisher: Mozilla Operating System: UNIX variants (UNIX, Linux, OSX) Windows Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction Denial of Service -- Remote with User Interaction Provide Misleading Information -- Remote with User Interaction Reduced Security -- Remote with User Interaction Resolution: Patch/Upgrade CVE Names: CVE-2021-23964 CVE-2021-23960 CVE-2021-23954 CVE-2021-23953 CVE-2020-26976 CVE-2020-15685 Reference: ESB-2020.4446 ESB-2020.4418 Original Bulletin: https://www.mozilla.org/en-US/security/advisories/mfsa2021-05/ - --------------------------BEGIN INCLUDED TEXT-------------------- Mozilla Foundation Security Advisory 2021-05 Security Vulnerabilities fixed in Thunderbird 78.7 Announced: January 26, 2021 Impact: high Products: Thunderbird Fixed in: Thunderbird 78.7 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-2021-23953: Cross-origin information leakage via redirected PDF requests Reporter: Rob Wu Impact: high Description If a user clicked into a specifically crafted PDF, the PDF reader could be confused into leaking cross-origin information, when said information is served as chunked data. References o Bug 1683940 # CVE-2021-23954: Type confusion when using logical assignment operators in JavaScript switch statements Reporter: Gary Kwong Impact: high Description Using the new logical assignment operators in a JavaScript switch statement could have caused a type confusion, leading to a memory corruption and a potentially exploitable crash. References o Bug 1684020 # CVE-2020-15685: IMAP Response Injection when using STARTTLS Reporter: Damian Poddebniak Impact: moderate Description During the plaintext phase of the STARTTLS connection setup, protocol commands could have been injected and evaluated within the encrypted session. References o Bug 1622640 # CVE-2020-26976: HTTPS pages could have been intercepted by a registered service worker when they should not have been Reporter: Andrew Sutherland Impact: moderate Description When a HTTPS page was embedded in a HTTP page, and there was a service worker registered for the former, the service worker could have intercepted the request for the secure page despite the iframe not being a secure context due to the (insecure) framing. References o Bug 1674343 # CVE-2021-23960: Use-after-poison for incorrectly redeclared JavaScript variables during GC Reporter: Irvan Kurniawan Impact: moderate Description Performing garbage collection on re-declared JavaScript variables resulted in a user-after-poison, and a potentially exploitable crash. References o Bug 1675755 # CVE-2021-23964: Memory safety bugs fixed in Thunderbird 78.7 Reporter: Mozilla developers and community Impact: high Description Mozilla developers Alexis Beingessner, Christian Holler, Andrew McCreight, Tyson Smith, Jon Coppeard, Andre Bargull, Jason Kratzer, Jesse Schwartzentruber, Steve Fink, Byron Campen reported memory safety bugs present in Thunderbird 78.6. 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 78.7 - --------------------------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. 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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBYBDa5eNLKJtyKPYoAQjdJw/9Huqk3tfSmu4rgXv/RK+75cMkl3GAAjav HhSfAZFi3Exj4CVswbcF92n3CCievBzER9OZII6z/OvjXCDtjRQykW2qDabUMiVa szUAa8n35M8sEX2BkYCs3i0eAsrmtrXyPAWa/aEpGG6Z1Ax8Ggzt1mUUtzDwq02M YAFALu4dL1B0m+n4o65g/+6sEqzRetaeLYvNJsr0hrKtLvpNZIJYx9GnUYZ3V7JD 3CMuIg8MeUcBwkxZNAVS+dN8gnT9X1i43gX7JegYhOcFuIFvYvq6bE0qlnzqVF/n hV3IGsLnt0Ta+21DQk1uv6Kgb7hinKPyBlwWDLBQeZC3dWuTDaUwmR2rwIas5pdi Hh0WzdvbIj2QkzJMTQcN2ESS7Z5QZ+ThkQrBOWTJ6WCvh5A7GzZKtAXh3/9OyrDl wSiX+auXfW+RmEKAJxqVJiP5P65wvqz/5rj3RtTBlmugnDbf+ptCI2llROBFVxWl Pu0vvVZCGxsfyyiGfkp3K0KiLrhGK8lQl/47wXU8cQwxfh1BNRgvxRzPNK7uOAF4 O/1sQoTN2zfCTXCD9tnTTsRu4jT596tiW/n34jeOOJhZNp8OcDzkXqmpMTGzc1Bc jpFwyaoawCzvIealfxKXWp85jc0c86zeLQ2jKJW1PtinKi+avlUceT50iW6cBTYq /d/lYBmL6ns= =tXB2 -----END PGP SIGNATURE-----