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MOZILLA FOUNDATION SECURITY ADVISORY 2020-05


SECURITY VULNERABILITIES FIXED IN FIREFOX 73

Announced February 11, 2020 Impact high Products Firefox Fixed in
 * Firefox 73

#CVE-2020-6796: MISSING BOUNDS CHECK ON SHARED MEMORY READ IN THE PARENT PROCESS

Reporter Thomas Imbert Impact high

DESCRIPTION

A content process could have modified shared memory relating to crash reporting
information, crash itself, and cause an out-of-bound write. This could have
caused memory corruption and a potentially exploitable crash.

REFERENCES

 * Bug 1610426

#CVE-2020-6797: EXTENSIONS GRANTED DOWNLOADS.OPEN PERMISSION COULD OPEN
ARBITRARY APPLICATIONS ON MAC OSX

Reporter Vladimir Metnew Impact moderate

DESCRIPTION

By downloading a file with the .fileloc extension, a semi-privileged extension
could launch an arbitrary application on the user's computer. The attacker is
restricted as they are unable to download non-quarantined files or supply
command line arguments to the application, limiting the impact.
Note: this issue only occurs on Mac OSX. Other operating systems are unaffected.

REFERENCES

 * Bug 1596668

#CVE-2020-6798: INCORRECT PARSING OF TEMPLATE TAG COULD RESULT IN JAVASCRIPT
INJECTION

Reporter terjanq Impact moderate

DESCRIPTION

If a <template> tag was used in a <select%gt; tag, the parser could be confused
and allow JavaScript parsing and execution when it should not be allowed. A site
that relied on the browser behaving correctly could suffer a cross-site
scripting vulnerability as a result.

REFERENCES

 * Bug 1602944

#CVE-2020-6799: ARBITRARY CODE EXECUTION WHEN OPENING PDF LINKS FROM OTHER
APPLICATIONS, WHEN FIREFOX IS CONFIGURED AS DEFAULT PDF READER

Reporter Joshua Graham & Brendan Scarvell Impact moderate

DESCRIPTION

Command line arguments could have been injected during Firefox invocation as a
shell handler for certain unsupported file types. This required Firefox to be
configured as the default handler for a given file type and for a file
downloaded to be opened in a third party application that insufficiently
sanitized URL data. In that situation, clicking a link in the third party
application could have been used to retrieve and execute files whose location
was supplied through command line arguments.
Note: This issue only affects Windows operating systems and when Firefox is
configured as the default handler for non-default filetypes. Other operating
systems are unaffected.

REFERENCES

 * Bug 1606596

#CVE-2020-6800: MEMORY SAFETY BUGS FIXED IN FIREFOX 73 AND FIREFOX ESR 68.5

Reporter Mozilla developers and community Impact high

DESCRIPTION

Mozilla developers and community members Raul Gurzau, Tyson Smith, Bob Clary,
Liz Henry, and Christian Holler reported memory safety bugs present in Firefox
72 and Firefox ESR 68.4. 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

 * Memory safety bugs fixed in Firefox 73 and Firefox ESR 68.5

#CVE-2020-6801: MEMORY SAFETY BUGS FIXED IN FIREFOX 73

Reporter Mozilla developers Impact high

DESCRIPTION

Mozilla developers Jason Kratzer, Tyson Smith, and Christian Holler reported
memory safety bugs present in Firefox 72. 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

 * Memory safety bugs fixed in Firefox 73

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