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AUSCERT External Security Bulletin Redistribution
ESB-2021.1004
MFSA 2021-11/12 Security Vulnerabilities fixed in Firefox
ESR 78.9 and Thunderbird 78.9
24 March 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Firefox ESR
Thunderbird
Publisher: Mozilla
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
Provide Misleading Information -- Remote with User Interaction
Access Confidential Data -- Remote with User Interaction
Reduced Security -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2021-23987 CVE-2021-23984 CVE-2021-23982
CVE-2021-23981
Original Bulletin:
https://www.mozilla.org/en-US/security/advisories/mfsa2021-11/
https://www.mozilla.org/en-US/security/advisories/mfsa2021-12/
Comment: This bulletin contains two (2) Mozilla security advisories.
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Mozilla Foundation Security Advisory 2021-11
Security Vulnerabilities fixed in Firefox ESR 78.9
Announced: March 23, 2021
Impact: high
Products: Firefox ESR
Fixed in: Firefox ESR 78.9
# CVE-2021-23981: Texture upload into an unbound backing buffer resulted in an
out-of-bound read
Reporter: Omair
Impact: high
Description
A texture upload of a Pixel Buffer Object could have confused the WebGL code to
skip binding the buffer used to unpack it, resulting in memory corruption and a
potentially exploitable information leak or crash.
References
o Bug 1692832
# CVE-2021-23982: Internal network hosts could have been probed by a malicious
webpage
Reporter: Samy Kamkar, Ben Seri, and Gregory Vishnepolsky
Impact: moderate
Description
Using techniques that built on the slipstream research, a malicious webpage
could have scanned both an internal network's hosts as well as services running
on the user's local machine utilizing WebRTC connections.
References
o Bug 1677046
# CVE-2021-23984: Malicious extensions could have spoofed popup information
Reporter: Rob Wu
Impact: moderate
Description
A malicious extension could have opened a popup window lacking an address bar.
The title of the popup lacking an address bar should not be fully controllable,
but in this situation was. This could have been used to spoof a website and
attempt to trick the user into providing credentials.
References
o Bug 1693664
# CVE-2021-23987: Memory safety bugs fixed in Firefox 87 and Firefox ESR 78.9
Reporter: Mozilla developers and community
Impact: high
Description
Mozilla developers and community members Alexis Beingessner, Tyson Smith,
Julien Wajsberg, and Matthew Gregan reported memory safety bugs present in
Firefox 86 and Firefox ESR 78.8. 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 87 and Firefox ESR 78.9
- --------------------------------------------------------------------------------
Mozilla Foundation Security Advisory 2021-12
Security Vulnerabilities fixed in Thunderbird 78.9
Announced: March 23, 2021
Impact: high
Products: Thunderbird
Fixed in: Thunderbird 78.9
In general, these flaws cannot be exploited through email in the Thunderbird
product because scripting is disabled when reading mail, but are potentially
risks in browser or browser-like contexts.
# CVE-2021-23981: Texture upload into an unbound backing buffer resulted in an
out-of-bound read
Reporter: Omair
Impact: high
Description
A texture upload of a Pixel Buffer Object could have confused the WebGL code to
skip binding the buffer used to unpack it, resulting in memory corruption and a
potentially exploitable information leak or crash.
References
o Bug 1692832
# CVE-2021-23982: Internal network hosts could have been probed by a malicious
webpage
Reporter: Samy Kamkar, Ben Seri, and Gregory Vishnepolsky
Impact: moderate
Description
Using techniques that built on the slipstream research, a malicious webpage
could have scanned both an internal network's hosts as well as services running
on the user's local machine utilizing WebRTC connections.
References
o Bug 1677046
# CVE-2021-23984: Malicious extensions could have spoofed popup information
Reporter: Rob Wu
Impact: moderate
Description
A malicious extension could have opened a popup window lacking an address bar.
The title of the popup lacking an address bar should not be fully controllable,
but in this situation was. This could have been used to spoof a website and
attempt to trick the user into providing credentials.
References
o Bug 1693664
# CVE-2021-23987: Memory safety bugs fixed in Thunderbird 78.9
Reporter: Mozilla developers and community
Impact: high
Description
Mozilla developers and community members Alexis Beingessner, Tyson Smith,
Julien Wajsberg, and Matthew Gregan reported memory safety bugs present in
Thunderbird 78.8. 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 Thunderbird 78.9
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