[MFSA-2021-11] Security Vulnerabilities fixed in Firefox ESR 78.9

Severity High

Affected Packages 1

Fixed Packages 1

CVEs 6

Note: This advisory was updated June 8, 2021 to include CVE-2021-29955 which was also fixed in this release.

CVE-2021-23981: Texture upload into an unbound backing buffer resulted in an out-of-bound read (high)
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.
CVE-2021-23982: Internal network hosts could have been probed by a malicious webpage (moderate)
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.
CVE-2021-23984: Malicious extensions could have spoofed popup information (moderate)
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.
CVE-2021-23987: Memory safety bugs fixed in Firefox 87 and Firefox ESR 78.9 (high)
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.
CVE-2021-29955: Transient Execution Vulnerability allowed leaking arbitrary memory address (high)
A transient execution vulnerability, named Floating Point Value Injection (FPVI) allowed an attacker to leak arbitrary memory addresses and may have also enabled JIT type confusion attacks. (A related vulnerability, Speculative Code Store Bypass (SCSB), did not affect Firefox.)
CVE-2021-4127: Angle graphics library out of date (high)
An out of date graphics library (Angle) likely contained vulnerabilities that could potentially be exploited.

Package	Affected Version
pkg:mozilla/Firefox%20ESR	< 78.9

Package	Fixed Version
pkg:mozilla/Firefox%20ESR	= 78.9

ID

MFSA-2021-11

Severity

high

URL

https://www.mozilla.org/en-US/security/advisories/mfsa2021-11

Published

2021-03-23T00:00:00
(3 years ago)

Modified

2021-03-23T00:00:00
(3 years ago)

Other Advisories

Source	# ID	Name	URL
Bugzilla	1692832		https://bugzilla.mozilla.org/show_bug.cgi?id=1692832
Bugzilla	1677046		https://bugzilla.mozilla.org/show_bug.cgi?id=1677046
Bugzilla	1693664		https://bugzilla.mozilla.org/show_bug.cgi?id=1693664
Bugzilla	1513519	Memory safety bugs fixed in Firefox 87 and Firefox ESR 78.9	https://bugzilla.mozilla.org/show_bug.cgi?id=1513519
Bugzilla	1683439	Memory safety bugs fixed in Firefox 87 and Firefox ESR 78.9	https://bugzilla.mozilla.org/show_bug.cgi?id=1683439
Bugzilla	1690169	Memory safety bugs fixed in Firefox 87 and Firefox ESR 78.9	https://bugzilla.mozilla.org/show_bug.cgi?id=1690169
Bugzilla	1690718	Memory safety bugs fixed in Firefox 87 and Firefox ESR 78.9	https://bugzilla.mozilla.org/show_bug.cgi?id=1690718
Bugzilla	1692972		https://bugzilla.mozilla.org/show_bug.cgi?id=1692972
Bugzilla	1691547		https://bugzilla.mozilla.org/show_bug.cgi?id=1691547

Type	Package URL	Namespace	Name / Product	Version	Distribution / Platform	Arch	Patch / Fix
Affected	pkg:mozilla/Firefox%20ESR		Firefox ESR	< 78.9
Fixed	pkg:mozilla/Firefox%20ESR		Firefox ESR	= 78.9

# CVE	Description	CVSS	EPSS	EPSS Trend (30 days)	Affected Products	Weaknesses	Security Advisories	Exploits	PoC	Pubblication Date	Modification Date
# CVE	Description	CVSS	EPSS	EPSS Trend (30 days)	Affected Products	Weaknesses	Security Advisories	PoC	Pubblication Date	Modification Date