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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.2579 MFSA 2020-32 Security Vulnerabilities fixed in Firefox ESR 78.1 29 July 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Firefox ESR Publisher: Mozilla Operating System: Windows UNIX variants (UNIX, Linux, OSX) Impact/Access: 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-2020-15659 CVE-2020-15658 CVE-2020-15657 CVE-2020-15656 CVE-2020-15655 CVE-2020-15654 CVE-2020-15653 CVE-2020-15652 CVE-2020-6514 CVE-2020-6463 Reference: ESB-2020.2569 Original Bulletin: https://www.mozilla.org/en-US/security/advisories/mfsa2020-32/ - --------------------------BEGIN INCLUDED TEXT-------------------- Mozilla Foundation Security Advisory 2020-32 Security Vulnerabilities fixed in Firefox ESR 78.1 Announced July 28, 2020 Impact high Products Firefox ESR Fixed in Firefox ESR 78.1 # CVE-2020-15652: Potential leak of redirect targets when loading scripts in a worker Reporter Mikhail Oblozhikhin Impact high Description By observing the stack trace for JavaScript errors in web workers, it was possible to leak the result of a cross-origin redirect. This applied only to content that can be parsed as script. References o Bug 1634872 # CVE-2020-6514: WebRTC data channel leaks internal address to peer Reporter Natalie Silvanovich of Google Project Zero Impact high Description WebRTC used the memory address of a class instance as a connection identifier. Unfortunately, this value is often transmitted to the peer, which allows bypassing ASLR. References o Bug 1642792 # CVE-2020-15655: Extension APIs could be used to bypass Same-Origin Policy Reporter Rob Wu Impact high Description Mozilla Developer Rob Wu discovered that a redirected HTTP request which is observed or modified through a web extension could bypass existing CORS checks, leading to potential disclosure of cross-origin information. References o Bug 1645204 # CVE-2020-15653: Bypassing iframe sandbox when allowing popups Reporter Anne van Kesteren Impact moderate Description Mozilla developer Anne van Kesteren discovered that <iframe sandbox> with the allow-popups flag could be bypassed when using noopener links. This could have led to security issues for websites relying on sandbox configurations that allowed popups and hosted arbitrary content. References o Bug 1521542 # CVE-2020-6463: Use-after-free in ANGLE gl::Texture::onUnbindAsSamplerTexture Reporter Reported by Pawel Wylecial of REDTEAM.PL Impact moderate Description Crafted media files could lead to a race in texture caches, resulting in a use-after-free, memory corruption, and a potentially exploitable crash. References o Bug 1635293 # CVE-2020-15656: Type confusion for special arguments in IonMonkey Reporter Carl Smith, working with Google Project Zero Impact moderate Description JIT optimizations involving the Javascript arguments object could confuse later optimizations. This risk was already mitigated by various precautions in the code, resulting in this bug rated at only moderate severity. References o Bug 1647293 # CVE-2020-15658: Overriding file type when saving to disk Reporter belden Impact low Description The code for downloading files did not properly take care of special characters, which led to an attacker being able to cut off the file ending at an earlier position, leading to a different file type being downloaded than shown in the dialog. References o Bug 1637745 # CVE-2020-15657: DLL hijacking due to incorrect loading path Reporter Steve Nyan Lin Impact low Description Firefox could be made to load attacker-supplied DLL files from the installation directory. This required an attacker that is already capable of placing files in the installation directory. Note: This issue only affected Windows operating systems. Other operating systems are unaffected. References o Bug 1644954 # CVE-2020-15654: Custom cursor can overlay user interface Reporter SophosLabs Offensive Security team Impact low Description When in an endless loop, a website specifying a custom cursor using CSS could make it look like the user is interacting with the user interface, when they are not. This could lead to a perceived broken state, especially when interactions with existing browser dialogs and warnings do not work. References o Bug 1648333 # CVE-2020-15659: Memory safety bugs fixed in Firefox 79 and Firefox ESR 78.1 Reporter Mozilla developers and community Impact high Description Mozilla developers and community members Natalia Csoregi, Simon Giesecke, Jason Kratzer, Christian Holler, and Luke Wagner reported memory safety bugs present in Firefox 78 and Firefox ESR 78.0. 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 79 and Firefox ESR 78.1 - --------------------------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 iQIVAwUBXyDrX+NLKJtyKPYoAQiLKA/+M99ihkqSgkAwftJNvp7T510rRRN2lw1A dOqz59RWEmtgRJMggVYp5HpwhsE8vUe4vRCR45d0JT8/AnhcQgtBb9sG2IF2frpE SROvo5jKFw2gJkX796CpU4Ngi1O6UOZ7VjWUD4zYu63hpklwV1zKfTRx8DNYsmV9 liGzlft81sZdTabDK1nAzaU1Coa2IsV7uM4bt6quAqCAnPVkw32X3qjOpI7zUt6e 1R3cZMQXrNbATiRO1FhEZqDejeTfkfFqBju80W1YoR1h0IR132nbt0fKplX0zTBL iKVvQHgsvmsMVv2V+ycZYdAJ1GWdWBnKOGIvOHDc0hy5Jdxg/asTyZjNC0MmM3ct pG6puwpaBoHjfPVFp3gpT03FHADRwJbSvpfYBNkQ6Et31lxqbyXm8oypCAFCp69L f3ar+83q1uN0r3m5H6XI5N0s9cPx8pbjHq+dxJg8QrOYOePjPwB0qIBG+7WNbNb5 lry/GJkV2pFyXd9RtJGIzZxT/+jTeSIw4b+tCCGDA2/BKVRrM2MoGwtNSp25kvVB wtmwgDTgONDXs+Ockld9aWDomeK06rfQDUGzdavQRnnWxIFL8Iq+Evl7DFtWfmXn lKx/4T+vE3/kzZo/8qA8Nj2rpIKB0uC+YLYoSIW1wnAjyPtqE1IFN+5jzJtAcgpX XSE7PSW94lw= =V8mY -----END PGP SIGNATURE-----