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AUSCERT External Security Bulletin Redistribution
ESB-2020.0054
MFSA 2020-01 Security Vulnerabilities fixed in Firefox 72
8 January 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
Cross-site Scripting -- Remote with User Interaction
Access Confidential Data -- Remote with User Interaction
Reduced Security -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2019-17025 CVE-2019-17024 CVE-2019-17023
CVE-2019-17022 CVE-2019-17021 CVE-2019-17020
CVE-2019-17019 CVE-2019-17018 CVE-2019-17017
CVE-2019-17016 CVE-2019-17015
Original Bulletin:
https://www.mozilla.org/en-US/security/advisories/mfsa2020-01/
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Mozilla Foundation Security Advisory 2020-01
Security Vulnerabilities fixed in Firefox 72
Announced
January 7, 2020
Impact
high
Products
Firefox
Fixed in
Firefox 72
# CVE-2019-17015: Memory corruption in parent process during new content
process initialization on Windows
Reporter
Thomas Imbert
Impact
high
Description
During the initialization of a new content process, a pointer offset can be
manipulated leading to memory corruption and a potentially exploitable crash in
the parent process.
Note: this issue only occurs on Windows. Other operating systems are
unaffected.
References
o Bug 1599005
# CVE-2019-17016: Bypass of @namespace CSS sanitization during pasting
Reporter
Michal Bentkowski
Impact
high
Description
When pasting a <style> tag from the clipboard into a rich text editor, the CSS
sanitizer incorrectly rewrites a @namespace rule. This could allow for
injection into certain types of websites resulting in data exfiltration.
References
o Bug 1599181
# CVE-2019-17017: Type Confusion in XPCVariant.cpp
Reporter
bo13oy
Impact
high
Description
Due to a missing case handling object types, a type confusion vulnerability
could occur, resulting in a crash. We presume that with enough effort that it
could be exploited to run arbitrary code.
References
o Bug 1603055
# CVE-2019-17018: Windows Keyboard in Private Browsing Mode may retain word
suggestions
Reporter
Siye Lui
Impact
moderate
Description
When in Private Browsing Mode on Windows 10, the Windows keyboard may retain
word suggestions to improve the accuracy of the keyboard.
References
o Bug 1549394
# CVE-2019-17019: Python files could be inadvertently executed upon opening a
download
Reporter
Prithwishk Kumar Pal
Impact
moderate
Description
When Python was installed on Windows, a python file being served with the MIME
type of text/plain could be executed by Python instead of being opened as a
text file when the Open option was selected upon download.
Note: this issue only occurs on Windows. Other operating systems are
unaffected.
References
o Bug 1568003
# CVE-2019-17020: Content Security Policy not applied to XSL stylesheets
applied to XML documents
Reporter
Matthew Somerville
Impact
moderate
Description
If an XML file is served with a Content Security Policy and the XML file
includes an XSL stylesheet, the Content Security Policy will not be applied to
the contents of the XSL stylesheet. If the XSL sheet e.g. includes JavaScript,
it would bypass any of the restrictions of the Content Security Policy applied
to the XML document.
References
o Bug 1597645
# CVE-2019-17021: Heap address disclosure in parent process during content
process initialization on Windows
Reporter
Thomas Imbert
Impact
moderate
Description
During the initialization of a new content process, a race condition occurs
that can allow a content process to disclose heap addresses from the parent
process.
Note: this issue only occurs on Windows. Other operating systems are
unaffected.
References
o Bug 1599008
# CVE-2019-17022: CSS sanitization does not escape HTML tags
Reporter
Michal Bentkowski
Impact
moderate
Description
When pasting a <style> tag from the clipboard into a rich text editor, the CSS
sanitizer does not escape < and > characters. Because the resulting string is
pasted directly into the text node of the element this does not result in a
direct injection into the webpage; however, if a webpage subsequently copies
the node's innerHTML, assigning it to another innerHTML, this would result in
an XSS vulnerability. Two WYSIWYG editors were identified with this behavior,
more may exist.
References
o Bug 1602843
# CVE-2019-17023: NSS may negotiate TLS 1.2 or below after a TLS 1.3
HelloRetryRequest had been sent
Reporter
Google oss-fuzz
Impact
low
Description
After a HelloRetryRequest has been sent, the client may negotiate a lower
protocol that TLS 1.3, resulting in an invalid state transition in the TLS
State Machine. If the client gets into this state, incoming Application Data
records will be ignored.
References
o Bug 1590001
# CVE-2019-17024: Memory safety bugs fixed in Firefox 72 and Firefox ESR 68.4
Reporter
Mozilla developers
Impact
high
Description
Mozilla developers Jason Kratzer, Christian Holler, and Bob Clary reported
memory safety bugs present in Firefox 71 and Firefox ESR 68.3. 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 72 and Firefox ESR 68.4
# CVE-2019-17025: Memory safety bugs fixed in Firefox 72
Reporter
Mozilla developers
Impact
high
Description
Mozilla developers Karl Tomlinson, Jason Kratzer, Tyson Smith, Jon Coppeard,
and Christian Holler reported memory safety bugs present in Firefox 71. 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 72
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