Mozilla Foundation Security Advisory 2020-16
Security Vulnerabilities fixed in Firefox 76
- Announced
- May 5, 2020
- Impact
- critical
- Products
- Firefox
- Fixed in
-
- Firefox 76
#CVE-2020-12387: Use-after-free during worker shutdown
- Reporter
- Looben Yang
- Impact
- critical
Description
A race condition when running shutdown code for Web Worker led to a use-after-free vulnerability. This resulted in a potentially exploitable crash.
References
#CVE-2020-12388: Sandbox escape with improperly guarded Access Tokens
- Reporter
- James Forshaw of Google Project Zero
- Impact
- critical
Description
The Firefox content processes did not sufficiently lockdown access control which could result in a sandbox escape.
Note: this issue only affects Firefox on Windows operating systems.
References
#CVE-2020-12389: Sandbox escape with improperly separated process types
- Reporter
- Niklas Baumstark
- Impact
- high
Description
The Firefox content processes did not sufficiently lockdown access control which could result in a sandbox escape.
Note: this issue only affects Firefox on Windows operating systems.
References
#CVE-2020-6831: Buffer overflow in SCTP chunk input validation
- Reporter
- Natalie Silvanovich of Google Project Zero
- Impact
- high
Description
A buffer overflow could occur when parsing and validating SCTP chunks in WebRTC. This could have led to memory corruption and a potentially exploitable crash.
References
#CVE-2020-12390: Incorrect serialization of nsIPrincipal.origin for IPv6 addresses
- Reporter
- Giorgio Maone
- Impact
- moderate
Description
Incorrect origin serialization of URLs with IPv6 addresses could lead to incorrect security checks
References
#CVE-2020-12391: Content-Security-Policy bypass using object elements
- Reporter
- Giorgio Maone
- Impact
- moderate
Description
Documents formed using data: URLs in an object element failed to inherit the CSP of the creating context. This allowed the execution of scripts that should have been blocked, albeit with a unique opaque origin.
References
#CVE-2020-12392: Arbitrary local file access with 'Copy as cURL'
- Reporter
- Ophir LOJKINE
- Impact
- moderate
Description
The 'Copy as cURL' feature of Devtools' network tab did not properly escape the HTTP POST data of a request, which can be controlled by the website. If a user used the 'Copy as cURL' feature and pasted the command into a terminal, it could have resulted in the disclosure of local files.
References
#CVE-2020-12393: Devtools' 'Copy as cURL' feature did not fully escape website-controlled data, potentially leading to command injection
- Reporter
- David Yesland
- Impact
- moderate
Description
The 'Copy as cURL' feature of Devtools' network tab did not properly escape the HTTP method of a request, which can be controlled by the website. If a user used the 'Copy as cURL' feature and pasted the command into a terminal, it could have resulted in command injection and arbitrary command execution.
Note: this issue only affects Firefox on Windows operating systems.
References
#CVE-2020-12394: URL spoofing in location bar when unfocussed
- Reporter
- Kestrel
- Impact
- low
Description
A logic flaw in our location bar implementation could have allowed a local attacker to spoof the current location by selecting a different origin and removing focus from the input element.
References
#CVE-2020-12395: Memory safety bugs fixed in Firefox 76 and Firefox ESR 68.8
- Reporter
- Mozilla developers and community
- Impact
- critical
Description
Mozilla developers and community members Alexandru Michis, Jason Kratzer, philipp, Ted Campbell, Bas Schouten, André Bargull, and Karl Tomlinson reported memory safety bugs present in Firefox 75 and Firefox ESR 68.7. 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
#CVE-2020-12396: Memory safety bugs fixed in Firefox 76
- Reporter
- Mozilla developers and community
- Impact
- high
Description
Mozilla developers and community members Frederik Braun, Andrew McCreight, C.M.Chang, and Dan Minor reported memory safety bugs present in Firefox 75. 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.