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AUSCERT External Security Bulletin Redistribution
MFSA 2020-08 Security Vulnerabilities fixed in Firefox 74
11 March 2020
AusCERT Security Bulletin Summary
Operating System: UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- 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
CVE Names: CVE-2020-6815 CVE-2020-6814 CVE-2020-6813
CVE-2020-6812 CVE-2020-6811 CVE-2020-6810
CVE-2020-6809 CVE-2020-6808 CVE-2020-6807
CVE-2020-6806 CVE-2020-6805 CVE-2019-20503
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Mozilla Foundation Security Advisory 2020-08
Security Vulnerabilities fixed in Firefox 74
March 10, 2020
# CVE-2020-6805: Use-after-free when removing data about origins
When removing data about an origin whose tab was recently closed, a
use-after-free could occur in the Quota manager, resulting in a potentially
o Bug 1610880
# CVE-2020-6806: BodyStream::OnInputStreamReady was missing protections against
Sergei Glazunov of Google Project Zero
By carefully crafting promise resolutions, it was possible to cause an
out-of-bounds read off the end of an array resized during script execution.
This could have led to memory corruption and a potentially exploitable crash.
o Bug 1612308
# CVE-2020-6807: Use-after-free in cubeb during stream destruction
When a device was changed while a stream was about to be destroyed, the
stream-reinit task may have been executed after the stream was destroyed,
causing a use-after-free and a potentially exploitable crash.
o Bug 1614971
this string is parsed to create an HTML document, which is then presented.
Previously, this document's URL (as reported by the document.location property,
attacks; it is now correctly the URL of the originating document.
o Bug 1247968
# CVE-2020-6809: Web Extensions with the all-urls permission could access local
When a Web Extension had the all-urls permission and made a fetch request with
a mode set to 'same-origin', it was possible for the Web Extension to read
o Bug 1420296
# CVE-2020-6810: Focusing a popup while in fullscreen could have obscured the
Avi Drissman of the Chrome security team
After a website had entered fullscreen mode, it could have used a previously
opened popup to obscure the notification that indicates the browser is in
fullscreen mode. Combined with spoofing the browser chrome, this could have led
to confusing the user about the current origin of the page and credential theft
or other attacks.
o Bug 1432856
# CVE-2020-6811: Devtools' 'Copy as cURL' feature did not fully escape
website-controlled data, potentially leading to command injection
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.
o Bug 1607742
# CVE-2019-20503: Out of bounds reads in sctp_load_addresses_from_init
Natalie Silvanovich of Google Project Zero
The inputs to sctp_load_addresses_from_init are verified by
sctp_arethere_unrecognized_parameters ; however, the two functions handled
parameter bounds differently, resulting in out of bounds reads when parameters
are partially outside a chunk.
o Bug 1613765
# CVE-2020-6812: The names of AirPods with personally identifiable information
were exposed to websites with camera or microphone permission
The first time AirPods are connected to an iPhone, they become named after the
user's name by default (e.g. Jane Doe's AirPods.) Websites with camera or
microphone permission are able to enumerate device names, disclosing the user's
name. To resolve this issue, Firefox added a special case that renames devices
containing the substring 'AirPods' to simply 'AirPods'.
o Bug 1616661
# CVE-2020-6813: @import statements in CSS could bypass the Content Security
Policy nonce feature
When protecting CSS blocks with the nonce feature of Content Security Policy,
the @import statement in the CSS block could allow an attacker to inject
arbitrary styles, bypassing the intent of the Content Security Policy.
o Bug 1605814
# CVE-2020-6814: Memory safety bugs fixed in Firefox 74 and Firefox ESR 68.6
Mozilla developers Byron Campen, Jason Kratzer, and Christian Holler reported
memory safety bugs present in Firefox 73 and Firefox ESR 68.5. 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.
o Memory safety bugs fixed in Firefox 74 and Firefox ESR 68.6
# CVE-2020-6815: Memory and script safety bugs fixed in Firefox 74
Mozilla developers and community
Mozilla developers Jason Kratzer, Boris Zbarsky, Tyson Smith, and Alexandru
Michis reported memory safety and script safety bugs present in Firefox 73.
Some of these bugs showed evidence of memory corruption or escalation of
privilege and we presume that with enough effort some of these could have been
exploited to run arbitrary code.
o Memory and script safety bugs fixed in Firefox 74
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