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AUSCERT Security Bulletin
ASB-2017.0210
Mozilla bulletin: Security vulnerabilities fixed in Firefox
8 December 2017
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AusCERT Security Bulletin Summary
---------------------------------
Product: Firefox
Operating System: UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Execute Arbitrary Code/Commands -- 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-2017-7845 CVE-2017-7843
Member content until: Sunday, January 7 2018
Reference: ASB-2017.0207
ESB-2017.3118
ESB-2017.3106
OVERVIEW
"Security vulnerabilities fixed in Firefox 57.0.1 and ESR 52.5.2" [1,2]
IMPACT
Mozilla has given the following information concerning these
vulnerabilities:
"#CVE-2017-7845: Buffer overflow when drawing and validating
elements with ANGLE library using Direct 3D 9
REPORTER Omair
IMPACT CRITICAL
Description
A buffer overflow occurs when drawing and validating elements using
Direct 3D 9 with the ANGLE graphics library, used for WebGL content.
This is due to an incorrect value being passed within the library
during checks and results in a potentially exploitable crash.
Note: This attack only affects Windows operating systems. Other
operating systems are unaffected.
References Bug 1402372
#CVE-2017-7843: Web worker in Private Browsing mode can write
IndexedDB data
REPORTER Konark
IMPACT HIGH
Description
When Private Browsing mode is used, it is possible for a web worker
to write persistent data to IndexedDB and fingerprint a user
uniquely. IndexedDB should not be available in Private Browsing mode
and this stored data will persist across multiple private browsing
mode sessions because it is not cleared when exiting.
References Bug 1410106" [1,2]
MITIGATION
Mozilla recommends updating Firefox to version 57.0.1 and ESR 52.5.2
[1,2]
REFERENCES
[1] Mozilla Foundation Security Advisory 2017-28
https://www.mozilla.org/en-US/security/advisories/mfsa2017-28/
[2] Mozilla Foundation Security Advisory 2017-29
https://www.mozilla.org/en-US/security/advisories/mfsa2017-29/
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.
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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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