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AUSCERT External Security Bulletin Redistribution
MFSA 2019-36 Security Vulnerabilities fixed in Firefox 71
4 December 2019
AusCERT Security Bulletin Summary
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Denial of Service -- Remote with User Interaction
Access Confidential Data -- Remote with User Interaction
Reduced Security -- Remote with User Interaction
CVE Names: CVE-2019-17014 CVE-2019-17013 CVE-2019-17012
CVE-2019-17011 CVE-2019-17010 CVE-2019-17009
CVE-2019-17008 CVE-2019-17005 CVE-2019-13722
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Mozilla Foundation Security Advisory 2019-36
Security Vulnerabilities fixed in - Firefox 71
December 3, 2019
# CVE-2019-11756: Use-after-free of SFTKSession object
Improper refcounting of soft token session objects could cause a use-after-free
and crash (likely limited to a denial of service).
o Bug 1508776
# CVE-2019-17008: Use-after-free in worker destruction
When using nested workers, a use-after-free could occur during worker
destruction. This resulted in a potentially exploitable crash.
o Bug 1546331
# CVE-2019-13722: Stack corruption due to incorrect number of arguments in
When setting a thread name on Windows in WebRTC, an incorrect number of
arguments could have been supplied, leading to stack corruption and a
potentially exploitable crash.
o Bug 1580156
# CVE-2019-11745: Out of bounds write in NSS when encrypting with a block
When encrypting with a block cipher, if a call to NSC_EncryptUpdate was made
with data smaller than the block size, a small out of bounds write could occur.
This could have caused heap corruption and a potentially exploitable crash.
o Bug 1586176
# CVE-2019-17014: Dragging and dropping a cross-origin resource, incorrectly
loaded as an image, could result in information disclosure
If an image had not loaded correctly (such as when it is not actually an
image), it could be dragged and dropped cross-domain, resulting in a
cross-origin information leak.
o Bug 1322864
# CVE-2019-17009: Updater temporary files accessible to unprivileged processes
When running, the updater service wrote status and log files to an unrestricted
location; potentially allowing an unprivileged process to locate and exploit a
vulnerability in file handling in the updater service.
o Bug 1510494
# CVE-2019-17010: Use-after-free when performing device orientation checks
Under certain conditions, when checking the Resist Fingerprinting preference
during device orientation checks, a race condition could have caused a
use-after-free and a potentially exploitable crash.
o Bug 1581084
# CVE-2019-17005: Buffer overflow in plain text serializer
The plain text serializer used a fixed-size array for the number of
elements it could process; however it was possible to overflow the
static-sized array leading to memory corruption and a potentially
o Bug 1584170
# CVE-2019-17011: Use-after-free when retrieving a document in antitracking
Under certain conditions, when retrieving a document from a DocShell in the
antitracking code, a race condition could cause a use-after-free condition and
a potentially exploitable crash.
o Bug 1591334
# CVE-2019-17012: Memory safety bugs fixed in Firefox 71 and Firefox ESR 68.3
Mozilla developers and community
Mozilla developers Christoph Diehl, Nathan Froyd, Jason Kratzer, Christian
Holler, Karl Tomlinson, Tyson Smith reported memory safety bugs present in
Firefox 70 and Firefox ESR 68.2. 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 71 and Firefox ESR 68.3
# CVE-2019-17013: Memory safety bugs fixed in Firefox 71
Mozilla developers and community
Mozilla developers and community members Philipp, Diego Calleja, Mikhail
Gavrilov, Jason Kratzer, Christian Holler, Markus Stange, Tyson Smith reported
memory safety bugs present in Firefox 70. 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 71
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