1. Home
  2. Security Advisories
  3. Mozilla
  4. MFSA-2021-54

[MFSA-2021-54] Security Vulnerabilities fixed in Thunderbird 91.4.0

Severity High
Affected Packages 1
Fixed Packages 1
CVEs 11
Info Packages References Vulnerabilities

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-2021-4129: Memory safety bugs fixed in Thunderbird 91.4.0 (high)
    Mozilla developers and community members Julian Hector, Randell Jesup, Gabriele Svelto, Tyson Smith, Christian Holler, and Masayuki Nakano reported memory safety bugs present in Thunderbird 91.3. 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-2021-43528: JavaScript unexpectedly enabled for the composition area (low)
    Thunderbird unexpectedly enabled JavaScript in the composition area.
    The JavaScript execution context was limited to this area and did not
    receive chrome-level privileges, but could be used as a stepping stone
    to further an attack with other vulnerabilities.

  • CVE-2021-43536: URL leakage when navigating while executing asynchronous function (high)
    Under certain circumstances, asynchronous functions could have caused a navigation to fail but expose the target URL.

  • CVE-2021-43537: Heap buffer overflow when using structured clone (high)
    An incorrect type conversion of sizes from 64bit to 32bit integers allowed an attacker to corrupt memory leading to a potentially exploitable crash.

  • CVE-2021-43538: Missing fullscreen and pointer lock notification when requesting both (high)
    By misusing a race in our notification code, an attacker could have forcefully hidden the notification for pages that had received full screen and pointer lock access, which could have been used for spoofing attacks.

  • CVE-2021-43539: GC rooting failure when calling wasm instance methods (high)
    Failure to correctly record the location of live pointers across wasm instance calls resulted in a GC occurring within the call not tracing those live pointers. This could have led to a use-after-free causing a potentially exploitable crash.

  • CVE-2021-43541: External protocol handler parameters were unescaped (moderate)
    When invoking protocol handlers for external protocols, a supplied parameter URL containing spaces was not properly escaped.

  • CVE-2021-43542: XMLHttpRequest error codes could have leaked the existence of an external protocol handler (moderate)
    Using XMLHttpRequest, an attacker could have identified installed applications by probing error messages for loading external protocols.

  • CVE-2021-43543: Bypass of CSP sandbox directive when embedding (moderate)
    Documents loaded with the CSP sandbox directive could have escaped the sandbox's script restriction by embedding additional content.

  • CVE-2021-43545: Denial of Service when using the Location API in a loop (low)
    Using the Location API in a loop could have caused severe application hangs and crashes.

  • CVE-2021-43546: Cursor spoofing could overlay user interface when native cursor is zoomed (low)
    It was possible to recreate previous cursor spoofing attacks against users with a zoomed native cursor.

Package Affected Version
pkg:mozilla/Thunderbird < 91.4.0
Package Fixed Version
pkg:mozilla/Thunderbird = 91.4.0
ID
MFSA-2021-54
Severity
high
URL
https://www.mozilla.org/en-US/security/advisories/mfsa2021-54
Published
2021-12-07T00:00:00
(2 years ago)
Modified
2021-12-07T00:00:00
(2 years ago)
Other Advisories
Type Package URL Namespace Name / Product Version Distribution / Platform Arch Patch / Fix
Affected pkg:mozilla/Thunderbird Thunderbird < 91.4.0
Fixed pkg:mozilla/Thunderbird Thunderbird = 91.4.0
# 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