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AUSCERT External Security Bulletin Redistribution
ESB-2020.1600
MFSA 2020-17 Security Vulnerabilities fixed in Firefox ESR 68.8
6 May 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Firefox
Publisher: Mozilla
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
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-2020-12395 CVE-2020-12393 CVE-2020-12392
CVE-2020-12389 CVE-2020-12388 CVE-2020-12387
CVE-2020-6831
Reference: ESB-2020.1599
Original Bulletin:
https://www.mozilla.org/en-US/security/advisories/mfsa2020-17/
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Mozilla Foundation Security Advisory 2020-17
Security Vulnerabilities fixed in Firefox ESR 68.8
Announced
May 5, 2020
Impact
critical
Products
Firefox ESR
Fixed in
Firefox ESR 68.8
# 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-2020-12392: 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-2020-12395: 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
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