06 May 2020
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.1599 MFSA 2020-16 Security Vulnerabilities fixed in Firefox 76 6 May 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Firefox 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 Access Confidential Data -- Remote with User Interaction Reduced Security -- Remote with User Interaction Resolution: Patch/Upgrade CVE Names: CVE-2020-12396 CVE-2020-12395 CVE-2020-12394 CVE-2020-12393 CVE-2020-12392 CVE-2020-12391 CVE-2020-12390 CVE-2020-12389 CVE-2020-12388 CVE-2020-12387 CVE-2020-6831 Original Bulletin: https://www.mozilla.org/en-US/security/advisories/mfsa2020-16/ - --------------------------BEGIN INCLUDED TEXT-------------------- Mozilla Foundation Security Advisory 2020-16 Security Vulnerabilities fixed in Firefox 76 Announced May 5, 2020 Impact critical Products Firefox Fixed in Firefox 76 # CVE-2020-12387: Use-after-free during worker shutdown Reporter Looben Yang Impact critical Description A race condition when running shutdown code for Web Worker led to a use-after-free vulnerability. This resulted in a potentially exploitable crash. References o Bug 1545345 # CVE-2020-12388: Sandbox escape with improperly guarded Access Tokens Reporter James Forshaw of Google Project Zero Impact critical Description The Firefox content processes did not sufficiently lockdown access control which could result in a sandbox escape. Note: this issue only affects Firefox on Windows operating systems. References o Bug 1618911 # CVE-2020-12389: Sandbox escape with improperly separated process types Reporter Niklas Baumstark Impact high Description The Firefox content processes did not sufficiently lockdown access control which could result in a sandbox escape. Note: this issue only affects Firefox on Windows operating systems. References o Bug 1554110 # CVE-2020-6831: Buffer overflow in SCTP chunk input validation Reporter Natalie Silvanovich of Google Project Zero Impact high Description A buffer overflow could occur when parsing and validating SCTP chunks in WebRTC. This could have led to memory corruption and a potentially exploitable crash. References o Bug 1632241 # CVE-2020-12390: Incorrect serialization of nsIPrincipal.origin for IPv6 addresses Reporter Giorgio Maone Impact moderate Description Incorrect origin serialization of URLs with IPv6 addresses could lead to incorrect security checks References o Bug 1141959 # CVE-2020-12391: Content-Security-Policy bypass using object elements Reporter Giorgio Maone Impact moderate Description Documents formed using data: URLs in an object element failed to inherit the CSP of the creating context. This allowed the execution of scripts that should have been blocked, albeit with a unique opaque origin. References o Bug 1457100 # CVE-2020-12392: Arbitrary local file access with 'Copy as cURL' Reporter Ophir LOJKINE Impact moderate Description The 'Copy as cURL' feature of Devtools' network tab did not properly escape the HTTP POST data of a request, which can be controlled by the website. If a user used the 'Copy as cURL' feature and pasted the command into a terminal, it could have resulted in the disclosure of local files. References o Bug 1614468 # CVE-2020-12393: Devtools' 'Copy as cURL' feature did not fully escape website-controlled data, potentially leading to command injection Reporter David Yesland Impact moderate Description The 'Copy as cURL' feature of Devtools' network tab did not properly escape the HTTP method of a request, which can be controlled by the website. If a user used the 'Copy as cURL' feature and pasted the command into a terminal, it could have resulted in command injection and arbitrary command execution. Note: this issue only affects Firefox on Windows operating systems. References o Bug 1615471 # CVE-2020-12394: URL spoofing in location bar when unfocussed Reporter Kestrel Impact low Description A logic flaw in our location bar implementation could have allowed a local attacker to spoof the current location by selecting a different origin and removing focus from the input element. References o Bug 1628288 # CVE-2020-12395: Memory safety bugs fixed in Firefox 76 and Firefox ESR 68.8 Reporter Mozilla developers and community Impact critical Description Mozilla developers and community members Alexandru Michis, Jason Kratzer, philipp, Ted Campbell, Bas Schouten, Andre Bargull, and Karl Tomlinson reported memory safety bugs present in Firefox 75 and Firefox ESR 68.7. 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 Firefox 76 and Firefox ESR 68.8 # CVE-2020-12396: Memory safety bugs fixed in Firefox 76 Reporter Mozilla developers and community Impact high Description Mozilla developers and community members Frederik Braun, Andrew McCreight, C.M.Chang, and Dan Minor reported memory safety bugs present in Firefox 75. 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 Firefox 76 - --------------------------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 email@example.com 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: firstname.lastname@example.org 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 iQIVAwUBXrIPomaOgq3Tt24GAQibAg//V+eHmWzlchCelkvRnGZgwo3RZIb9eOvQ AsGfEIeHVuaZh8682xAo6jPRt0ecxNEZzfqPuC1ErPMtumcqs/HbcL0pNK20bE2/ 6kgcFWJ1K2/eC08cR6jxcc3p9b24rYx1z2Gyo+j6nOu64nZHDhwx+WyaxJljjFt3 iX4PbNTFuKLs2GfHVitFdlnqEE8IKa4Yit8ZTR58Cr7sc3UQr+MpYu9TiiL/5rR6 9UW1Is5j/ot74dsKsTGMAEBfoAJ9lRMnrxWNYGTCl6cg1VHSEl36TfFc+w9ggx7g hVbK8H6KW0CS3hRhts/TMI5bcXmN44jRBeH6iH/62hSvlWY1jWXXLWI2R2fg+h0M Uvl+ee7h+XtkIcIT9KNVyfC+4HD9RLlvzj2Imm1HTK4KNyxeYJPipnVESSYQALlA DFLck5MtjOWsn/SiVeS539P00u3GPKSo/4234/b0hSQ1rF5CaBm81V7/bcOFUejK 7jzzCbRdt/zMFja4p12xEeyCSFbXgMrlyksrDodVNYnkdi0OxqD/3k74ZKaf5Fx5 SJ+2sbEg+0egYzVjIvSjD5fsKEGF4QhVimpwqflPK79jCUhhEMLKYa/s6THYcy02 1y7vp3RhZliSA4p/RTzXFqrYL7H+PIk8dPb9oKdk8B7i112UgrBVyaj3qGwMM4XB kslWES5vGOQ= =oer6 -----END PGP SIGNATURE-----