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AUSCERT External Security Bulletin Redistribution
ESB-2020.0055
MFSA 2020-02 Security Vulnerabilities fixed in Firefox ESR 68.4
8 January 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Firefox Extended Support Release
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
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-2019-17024 CVE-2019-17022 CVE-2019-17021
CVE-2019-17017 CVE-2019-17016 CVE-2019-17015
Reference: ESB-2020.0054
Original Bulletin:
https://www.mozilla.org/en-US/security/advisories/mfsa2020-02/
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Mozilla Foundation Security Advisory 2020-02
Security Vulnerabilities fixed in Firefox ESR 68.4
Announced
January 7, 2020
Impact
high
Products
Firefox ESR
Fixed in
Firefox ESR 68.4
# 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-2019-17021: 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-2019-17024: 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
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