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AUSCERT External Security Bulletin Redistribution
ESB-2020.1919
MFSA 2020-20 Security Vulnerabilities fixed in Firefox 77
3 June 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
Provide Misleading Information -- Remote with User Interaction
Access Confidential Data -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2020-12411 CVE-2020-12410 CVE-2020-12409
CVE-2020-12408 CVE-2020-12407 CVE-2020-12406
CVE-2020-12405 CVE-2020-12399
Original Bulletin:
https://www.mozilla.org/en-US/security/advisories/mfsa2020-20/
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Mozilla Foundation Security Advisory 2020-20
Security Vulnerabilities fixed in Firefox 77
Announced
June 2, 2020
Impact
high
Products
Firefox
Fixed in
Firefox 77
# CVE-2020-12399: Timing attack on DSA signatures in NSS library
Reporter
Cesar Pereida Garcia and the Network and Information Security Group (NISEC)
at Tampere University
Impact
high
Description
NSS has shown timing differences when performing DSA signatures, which was
exploitable and could eventually leak private keys.
References
o Bug 1631576
# CVE-2020-12405: Use-after-free in SharedWorkerService
Reporter
Marcin 'Icewall' Noga of Cisco Talos
Impact
high
Description
When browsing a malicious page, a race condition in our SharedWorkerService
could occur and lead to a potentially exploitable crash.
References
o Bug 1631618
# CVE-2020-12406: JavaScript type confusion with NativeTypes
Reporter
Iain Ireland
Impact
high
Description
Mozilla Developer Iain Ireland discovered a missing type check during unboxed
objects removal, resulting in a crash. We presume that with enough effort that
it could be exploited to run arbitrary code.
References
o Bug 1639590
# CVE-2020-12407: WebRender leaking GPU memory when using border-image CSS
directive
Reporter
Nicolas Silva
Impact
moderate
Description
Mozilla Developer Nicolas Silva found that when using WebRender, Firefox would
under certain conditions leak arbitrary GPU memory to the visible screen. The
leaked memory content was visible to the user, but not observable from web
content.
References
o Bug 1637112
# CVE-2020-12408: URL spoofing when using IP addresses
Reporter
Rayyan Bijoora
Impact
low
Description
When browsing a document hosted on an IP address, an attacker could insert
certain characters to flip domain and path information in the address bar.
References
o Bug 1623888
# CVE-2020-12409: URL spoofing with unicode characters
Reporter
Rayyan Bijoora
Impact
low
Description
When using certain blank characters in a URL, they where incorrectly rendered
as spaces instead of an encoded URL.
References
o Bug 1629506
# CVE-2020-12410: Memory safety bugs fixed in Firefox 77 and Firefox ESR 68.9
Reporter
Mozilla developers
Impact
high
Description
Mozilla developers Tom Tung and Karl Tomlinson reported memory safety bugs
present in Firefox 76 and Firefox ESR 68.8. 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 77 and Firefox ESR 68.9
# CVE-2020-12411: Memory safety bugs fixed in Firefox 77
Reporter
Mozilla developers
Impact
high
Description
Mozilla developers :Gijs (he/him), Randell Jesup reported memory safety bugs
present in Firefox 76. 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 77
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