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===========================================================================
AUSCERT Security Bulletin
ASB-2019.0252
Multiple vulnerabilities have been identified in Mozilla
Firefox and Firefox ESR
4 September 2019
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Mozilla Firefox
Mozilla Firefox ESR
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Increased Privileges -- Existing Account
Access Privileged Data -- Remote with User Interaction
Modify Arbitrary Files -- Existing Account
Cross-site Scripting -- Remote with User Interaction
Denial of Service -- Remote with User Interaction
Access Confidential Data -- Remote/Unauthenticated
Reduced Security -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2019-11753 CVE-2019-11752 CVE-2019-11751
CVE-2019-11750 CVE-2019-11749 CVE-2019-11748
CVE-2019-11747 CVE-2019-11746 CVE-2019-11744
CVE-2019-11743 CVE-2019-11742 CVE-2019-11741
CVE-2019-11740 CVE-2019-11738 CVE-2019-11737
CVE-2019-11736 CVE-2019-11735 CVE-2019-11734
CVE-2019-9812 CVE-2019-5849
Member content until: Friday, October 4 2019
Reference: ESB-2019.3085
OVERVIEW
Multiple vulnerabilities have been identified in Mozilla Firefox
versions prior to 69, Firefox ESR versions prior to 68.1 and 60.9.
[1-3]
IMPACT
The vendor has provided the following details regarding the
vulnerabilities:
" CVE-2019-11751: Malicious code execution through command line
parameters
Reporter Ping Fan (Zetta) Ke of VXRL working with iDefense Labs
Impact critical
Description
Logging-related command line parameters are not properly sanitized
when Firefox is launched by another program, such as when a user
clicks on malicious links in a chat application. This can be used to
write a log file to an arbitrary location such as the Windows
'Startup' folder. Note: this issue only affects Firefox on Windows
operating systems.
References
o Bug 1572838
# CVE-2019-11746: Use-after-free while manipulating video
Reporter Nils Impact high
Description
A use-after-free vulnerability can occur while manipulating video
elements if the body is freed while still in use. This results in a
potentially exploitable crash.
References
o Bug 1564449
# CVE-2019-11744: XSS by breaking out of title and textarea elements
using innerHTML
Reporter Rakesh Mane Impact high
Description
Some HTML elements, such as <title> and <textarea> , can contain
literal angle brackets without treating them as markup. It is
possible to pass a literal closing tag to .innerHTML on these
elements, and subsequent content after that will be parsed as if it
were outside the tag. This can lead to XSS if a site does not filter
user input as strictly for these elements as it does for other
elements.
References
o Bug 1562033
# CVE-2019-11742: Same-origin policy violation with SVG filters and
canvas to steal cross-origin images
Reporter Paul Stone Impact high
Description
A same-origin policy violation occurs allowing the theft of
cross-origin images through a combination of SVG filters and a
<canvas> element due to an error in how same-origin policy is
applied to cached image content. The resulting same-origin policy
violation could allow for data theft.
References
o Bug 1559715
# CVE-2019-11736: File manipulation and privilege escalation in
Mozilla Maintenance Service
Reporter Seb Patane Impact high
Description
The Mozilla Maintenance Service does not guard against files being
hardlinked to another file in the updates directory, allowing for
the replacement of local files, including the Maintenance Service
executable, which is run with privileged access. Additionally, there
was a race condition during checks for junctions and symbolic links
by the Maintenance Service, allowing for potential local file and
directory manipulation to be undetected in some circumstances. This
allows for potential privilege escalation by a user with
unprivileged local access. Note: These attacks requires local system
access and only affects Windows. Other operating systems are not
affected.
References
o Bug 1551913 o Bug 1552206
# CVE-2019-11753: Privilege escalation with Mozilla Maintenance
Service in custom Firefox installation location
Reporter Holger Fuhrmannek Impact high
Description
The Firefox installer allows Firefox to be installed to a custom
user writable location, leaving it unprotected from manipulation by
unprivileged users or malware. If the Mozilla Maintenance Service is
manipulated to update this unprotected location and the updated
maintenance service in the unprotected location has been altered,
the altered maintenance service can run with elevated privileges
during the update process due to a lack of integrity checks. This
allows for privilege escalation if the executable has been replaced
locally. Note: This attack requires local system access and only
affects Windows. Other operating systems are not affected.
References
o Bug 1574980
# CVE-2019-11752: Use-after-free while extracting a key value in
IndexedDB
Reporter Zhanjia Song Impact high
Description
It is possible to delete an IndexedDB key value and subsequently try
to extract it during conversion. This results in a use-after-free
and a potentially exploitable crash.
References
o Bug 1501152
# CVE-2019-9812: Sandbox escape through Firefox Sync
Reporter Niklas Baumstark via TrendMicro's Zero Day Initiative
Impact high
Description
Given a compromised sandboxed content process due to a separate
vulnerability, it is possible to escape that sandbox by loading
accounts.firefox.com in that process and forcing a log-in to a
malicious Firefox Sync account. Preference settings that disable the
sandbox are then synchronized to the local machine and the
compromised browser would restart without the sandbox if a crash is
triggered.
References
o Bug 1538008 o Bug 1538015
# CVE-2019-11741: Isolate addons.mozilla.org and
accounts.firefox.com
Reporter Niklas Baumstark via TrendMicro's Zero Day Initiative
Impact high
Description
A compromised sandboxed content process can perform a Universal
Cross-site Scripting (UXSS) attack on content from any site it can
cause to be loaded in the same process. Because addons.mozilla.org
and accounts.firefox.com have close ties to the Firefox product,
malicious manipulation of these sites within the browser can
potentially be used to modify a user's Firefox configuration. These
two sites will now be isolated into their own process and not
allowed to be loaded in a standard content process.
References
o Bug 1539595
# CVE-2019-11743: Cross-origin access to unload event attributes
Reporter Yoav Weiss Impact moderate
Description
Navigation events were not fully adhering to the W3C's
"Navigation-Timing Level 2" draft specification in some instances
for the unload event, which restricts access to detailed timing
attributes to only be same-origin. This resulted in potential
cross-origin information exposure of history through timing
side-channel attacks.
References
o Bug 1560495 o Navigation-Timing Level 2 specification
# CVE-2019-11748: Persistence of WebRTC permissions in a third party
context
Reporter Jan-Ivar Bruaroey Impact moderate
Description
WebRTC in Firefox will honor persisted permissions given to sites
for access to microphone and camera resources even when in a
third-party context. In light of recent high profile vulnerabilities
in other software, a decision was made to no longer persist these
permissions. This avoids the possibility of trusted WebRTC resources
being invisibly embedded in web content and abusing permissions
previously given by users. Users will now be prompted for
permissions on each use.
References
o Bug 1564588
# CVE-2019-11749: Camera information available without prompting
using getUserMedia
Reporter Andreas Pehrson Impact moderate
Description
A vulnerability exists in WebRTC where malicious web content can use
probing techniques on the getUserMedia API using constraints to
reveal device properties of cameras on the system without triggering
a user prompt or notification. This allows for the potential
fingerprinting of users.
References
o Bug 1565374
# CVE-2019-5849: Out-of-bounds read in Skia
Reporter Zhen Zhou of NSFOCUS Security Team Impact moderate
Description
An out-of-bounds read vulnerability exists in the Skia graphics
library, allowing for the possible leaking of data from memory.
References
o Bug 1555838
# CVE-2019-11750: Type confusion in Spidermonkey
Reporter Qixun Zhao of Qihoo 360 Vulcan Team Impact moderate
Description
A type confusion vulnerability exists in Spidermonkey, which results
in a non-exploitable crash.
References
o Bug 1568397
# CVE-2019-11737: Content security policy directives ignore port and
path if host is a wildcard
Reporter Xiaoyin Liu Impact low
Description
If a wildcard ('*') is specified for the host in Content Security
Policy (CSP) directives, any port or path restriction of the
directive will be ignored, leading to CSP directives not being
properly applied to content.
References
o Bug 1388015
# CVE-2019-11738: Content security policy bypass through hash-based
sources in directives
Reporter Wladimir Palant Impact low
Description
If a Content Security Policy (CSP) directive is defined that uses a
hash-based source that takes the empty string as input, execution of
any javascript: URIs will be allowed. This could allow for malicious
JavaScript content to be run, bypassing CSP permissions.
References
o Bug 1452037
# CVE-2019-11747: 'Forget about this site' removes sites from
pre-loaded HSTS list
Reporter Thomas Henlich Impact low
Description
The "Forget about this site" feature in the History pane is intended
to remove all saved user data that indicates a user has visited a
site. This includes removing any HTTP Strict Transport Security
(HSTS) settings received from sites that use it. Due to a bug, sites
on the pre-load list also have their HSTS setting removed. On the
next visit to that site if the user specifies an http: URL rather
than secure https: they will not be protected by the pre-loaded HSTS
setting. After that visit the site's HSTS setting will be restored.
References
o Bug 1564481
# CVE-2019-11734: Memory safety bugs fixed in Firefox 69
Reporter Mozilla developers and community Impact high
Description
Mozilla developers and community members Randell Jesup, Philipp,
Cosmin Sabou, and Natalia Csoregi reported memory safety bugs
present in Firefox 68. Some of these bugs showed evidence of memory
corruption and we presume that with enough effort that some of these
could be exploited to run arbitrary code.
References
o Memory safety bugs fixed in Firefox 69
# CVE-2019-11735: Memory safety bugs fixed in Firefox 69 and Firefox
ESR 68.1
Reporter Mozilla developers and community Impact high
Description
Mozilla developers and community members Mikhail Gavrilov, Tyson
Smith, Marcia Knous, Tom Ritter, Philipp, and Bob Owens reported
memory safety bugs present in Firefox 68 and Firefox ESR 68. Some of
these bugs showed evidence of memory corruption and we presume that
with enough effort that some of these could be exploited to run
arbitrary code.
References
o Memory safety bugs fixed in Firefox 69 and Firefox ESR 68.1
# CVE-2019-11740: Memory safety bugs fixed in Firefox 69, Firefox
ESR 68.1, and Firefox ESR 60.9
Reporter Mozilla developers and community Impact high
Description
Mozilla developers and community members Tyson Smith and Nathan
Froyd reported memory safety bugs present in Firefox 68, Firefox ESR
68, and Firefox 60.8. Some of these bugs showed evidence of memory
corruption and we presume that with enough effort that some of these
could be exploited to run arbitrary code.
References
o Memory safety bugs fixed in Firefox 69, Firefox ESR 68.1, and
Firefox ESR 60.9" [1]
"# CVE-2019-11751: Malicious code execution through command line
parameters
Reporter Ping Fan (Zetta) Ke of VXRL working with iDefense Labs
Impact critical
Description
Logging-related command line parameters are not properly sanitized
when Firefox is launched by another program, such as when a user
clicks on malicious links in a chat application. This can be used to
write a log file to an arbitrary location such as the Windows
'Startup' folder. Note: this issue only affects Firefox on Windows
operating systems.
References
o Bug 1572838
# CVE-2019-11746: Use-after-free while manipulating video
Reporter Nils Impact high
Description
A use-after-free vulnerability can occur while manipulating video
elements if the body is freed while still in use. This results in a
potentially exploitable crash.
References
o Bug 1564449
# CVE-2019-11744: XSS by breaking out of title and textarea elements
using innerHTML
Reporter Rakesh Mane Impact high
Description
Some HTML elements, such as <title> and <textarea> , can contain
literal angle brackets without treating them as markup. It is
possible to pass a literal closing tag to .innerHTML on these
elements, and subsequent content after that will be parsed as if it
were outside the tag. This can lead to XSS if a site does not filter
user input as strictly for these elements as it does for other
elements.
References
o Bug 1562033
# CVE-2019-11742: Same-origin policy violation with SVG filters and
canvas to steal cross-origin images
Reporter Paul Stone Impact high
Description
A same-origin policy violation occurs allowing the theft of
cross-origin images through a combination of SVG filters and a
<canvas> element due to an error in how same-origin policy is
applied to cached image content. The resulting same-origin policy
violation could allow for data theft.
References
o Bug 1559715
# CVE-2019-11736: File manipulation and privilege escalation in
Mozilla Maintenance Service
Reporter Seb Patane Impact high
Description
The Mozilla Maintenance Service does not guard against files being
hardlinked to another file in the updates directory, allowing for
the replacement of local files, including the Maintenance Service
executable, which is run with privileged access. Additionally, there
was a race condition during checks for junctions and symbolic links
by the Maintenance Service, allowing for potential local file and
directory manipulation to be undetected in some circumstances. This
allows for potential privilege escalation by a user with
unprivileged local access. Note: These attacks requires local system
access and only affects Windows. Other operating systems are not
affected.
References
o Bug 1551913 o Bug 1552206
# CVE-2019-11753: Privilege escalation with Mozilla Maintenance
Service in custom Firefox installation location
Reporter Holger Fuhrmannek Impact high
Description
The Firefox installer allows Firefox to be installed to a custom
user writable location, leaving it unprotected from manipulation by
unprivileged users or malware. If the Mozilla Maintenance Service is
manipulated to update this unprotected location and the updated
maintenance service in the unprotected location has been altered,
the altered maintenance service can run with elevated privileges
during the update process due to a lack of integrity checks. This
allows for privilege escalation if the executable has been replaced
locally. Note: This attack requires local system access and only
affects Windows. Other operating systems are not affected.
References
o Bug 1574980
# CVE-2019-11752: Use-after-free while extracting a key value in
IndexedDB
Reporter Zhanjia Song Impact high
Description
It is possible to delete an IndexedDB key value and subsequently try
to extract it during conversion. This results in a use-after-free
and a potentially exploitable crash.
References
o Bug 1501152
# CVE-2019-9812: Sandbox escape through Firefox Sync
Reporter Niklas Baumstark via TrendMicro's Zero Day Initiative
Impact high
Description
Given a compromised sandboxed content process due to a separate
vulnerability, it is possible to escape that sandbox by loading
accounts.firefox.com in that process and forcing a log-in to a
malicious Firefox Sync account. Preference settings that disable the
sandbox are then synchronized to the local machine and the
compromised browser would restart without the sandbox if a crash is
triggered.
References
o Bug 1538008 o Bug 1538015
# CVE-2019-11743: Cross-origin access to unload event attributes
Reporter Yoav Weiss Impact moderate
Description
Navigation events were not fully adhering to the W3C's
"Navigation-Timing Level 2" draft specification in some instances
for the unload event, which restricts access to detailed timing
attributes to only be same-origin. This resulted in potential
cross-origin information exposure of history through timing
side-channel attacks.
References
o Bug 1560495 o Navigation-Timing Level 2 specification
# CVE-2019-11748: Persistence of WebRTC permissions in a third party
context
Reporter Jan-Ivar Bruaroey Impact moderate
Description
WebRTC in Firefox will honor persisted permissions given to sites
for access to microphone and camera resources even when in a
third-party context. In light of recent high profile vulnerabilities
in other software, a decision was made to no longer persist these
permissions. This avoids the possibility of trusted WebRTC resources
being invisibly embedded in web content and abusing permissions
previously given by users. Users will now be prompted for
permissions on each use.
References
o Bug 1564588
# CVE-2019-11749: Camera information available without prompting
using getUserMedia
Reporter Andreas Pehrson Impact moderate
Description
A vulnerability exists in WebRTC where malicious web content can use
probing techniques on the getUserMedia API using constraints to
reveal device properties of cameras on the system without triggering
a user prompt or notification. This allows for the potential
fingerprinting of users.
References
o Bug 1565374
# CVE-2019-11750: Type confusion in Spidermonkey
Reporter Qixun Zhao of Qihoo 360 Vulcan Team Impact moderate
Description
A type confusion vulnerability exists in Spidermonkey, which results
in a non-exploitable crash.
References
o Bug 1568397
# CVE-2019-11738: Content security policy bypass through hash-based
sources in directives
Reporter Wladimir Palant Impact low
Description
If a Content Security Policy (CSP) directive is defined that uses a
hash-based source that takes the empty string as input, execution of
any javascript: URIs will be allowed. This could allow for malicious
JavaScript content to be run, bypassing CSP permissions.
References
o Bug 1452037
# CVE-2019-11747: 'Forget about this site' removes sites from
pre-loaded HSTS list
Reporter Thomas Henlich Impact low
Description
The "Forget about this site" feature in the History pane is intended
to remove all saved user data that indicates a user has visited a
site. This includes removing any HTTP Strict Transport Security
(HSTS) settings received from sites that use it. Due to a bug, sites
on the pre-load list also have their HSTS setting removed. On the
next visit to that site if the user specifies an http: URL rather
than secure https: they will not be protected by the pre-loaded HSTS
setting. After that visit the site's HSTS setting will be restored.
References
o Bug 1564481
# CVE-2019-11735: Memory safety bugs fixed in Firefox 69 and Firefox
ESR 68.1
Reporter Mozilla developers and community Impact high
Description
Mozilla developers and community members Mikhail Gavrilov, Tyson
Smith, Marcia Knous, Tom Ritter, Philipp, and Bob Owens reported
memory safety bugs present in Firefox 68 and Firefox ESR 68. Some of
these bugs showed evidence of memory corruption and we presume that
with enough effort that some of these could be exploited to run
arbitrary code.
References
o Memory safety bugs fixed in Firefox 69 and Firefox ESR 68.1
# CVE-2019-11740: Memory safety bugs fixed in Firefox 69, Firefox
ESR 68.1, and Firefox ESR 60.9
Reporter Mozilla developers and community Impact high
Description
Mozilla developers and community members Tyson Smith and Nathan
Froyd reported memory safety bugs present in Firefox 68, Firefox ESR
68, and Firefox 60.8. Some of these bugs showed evidence of memory
corruption and we presume that with enough effort that some of these
could be exploited to run arbitrary code.
References
o Memory safety bugs fixed in Firefox 69, Firefox ESR 68.1, and
Firefox ESR 60.9" [2]
"# CVE-2019-11746: Use-after-free while manipulating video
Reporter Nils Impact high
Description
A use-after-free vulnerability can occur while manipulating video
elements if the body is freed while still in use. This results in a
potentially exploitable crash.
References
o Bug 1564449
# CVE-2019-11744: XSS by breaking out of title and textarea elements
using innerHTML
Reporter Rakesh Mane Impact high
Description
Some HTML elements, such as <title> and <textarea> , can contain
literal angle brackets without treating them as markup. It is
possible to pass a literal closing tag to .innerHTML on these
elements, and subsequent content after that will be parsed as if it
were outside the tag. This can lead to XSS if a site does not filter
user input as strictly for these elements as it does for other
elements.
References
o Bug 1562033
# CVE-2019-11742: Same-origin policy violation with SVG filters and
canvas to steal cross-origin images
Reporter Paul Stone Impact high
Description
A same-origin policy violation occurs allowing the theft of
cross-origin images through a combination of SVG filters and a
<canvas> element due to an error in how same-origin policy is
applied to cached image content. The resulting same-origin policy
violation could allow for data theft.
References
o Bug 1559715
# CVE-2019-11753: Privilege escalation with Mozilla Maintenance
Service in custom Firefox installation location
Reporter Holger Fuhrmannek Impact high
Description
The Firefox installer allows Firefox to be installed to a custom
user writable location, leaving it unprotected from manipulation by
unprivileged users or malware. If the Mozilla Maintenance Service is
manipulated to update this unprotected location and the updated
maintenance service in the unprotected location has been altered,
the altered maintenance service can run with elevated privileges
during the update process due to a lack of integrity checks. This
allows for privilege escalation if the executable has been replaced
locally. Note: This attack requires local system access and only
affects Windows. Other operating systems are not affected.
References
o Bug 1574980
# CVE-2019-11752: Use-after-free while extracting a key value in
IndexedDB
Reporter Zhanjia Song Impact high
Description
It is possible to delete an IndexedDB key value and subsequently try
to extract it during conversion. This results in a use-after-free
and a potentially exploitable crash.
References
o Bug 1501152
# CVE-2019-9812: Sandbox escape through Firefox Sync
Reporter Niklas Baumstark via TrendMicro's Zero Day Initiative
Impact high
Description
Given a compromised sandboxed content process due to a separate
vulnerability, it is possible to escape that sandbox by loading
accounts.firefox.com in that process and forcing a log-in to a
malicious Firefox Sync account. Preference settings that disable the
sandbox are then synchronized to the local machine and the
compromised browser would restart without the sandbox if a crash is
triggered.
References
o Bug 1538008 o Bug 1538015
# CVE-2019-11743: Cross-origin access to unload event attributes
Reporter Yoav Weiss Impact moderate
Description
Navigation events were not fully adhering to the W3C's
"Navigation-Timing Level 2" draft specification in some instances
for the unload event, which restricts access to detailed timing
attributes to only be same-origin. This resulted in potential
cross-origin information exposure of history through timing
side-channel attacks.
References
o Bug 1560495 o Navigation-Timing Level 2 specification
# CVE-2019-11740: Memory safety bugs fixed in Firefox 69, Firefox
ESR 68.1, and Firefox ESR 60.9
Reporter Mozilla developers and community Impact high
Description
Mozilla developers and community members Tyson Smith and Nathan
Froyd reported memory safety bugs present in Firefox 68, Firefox ESR
68, and Firefox 60.8. Some of these bugs showed evidence of memory
corruption and we presume that with enough effort that some of these
could be exploited to run arbitrary code.
References
o Memory safety bugs fixed in Firefox 69, Firefox ESR 68.1, and
Firefox ESR 60.9" [3]
MITIGATION
The vendor recommends upgrading to the latest versions to address
these issues. [1-3]
REFERENCES
[1] MFSA 2019-25 Security vulnerabilities fixed in Firefox 69
https://www.mozilla.org/en-US/security/advisories/mfsa2019-25/
[2] MFSA 2019-26 Security vulnerabilities fixed in Firefox ESR 68.1
https://www.mozilla.org/en-US/security/advisories/mfsa2019-26/
[3] MFSA 2019-27 Security vulnerabilities fixed in Firefox ESR 60.9
https://www.mozilla.org/en-US/security/advisories/mfsa2019-27/
AusCERT has made every effort to ensure that the information contained
in this document is accurate. However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
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