Vulnerability CVE-2020-26950: Information

Description

In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.

Severity: HIGH (8.8) Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

URL: https://nvd.nist.gov/vuln/detail/CVE-2020-26950
Published: Dec. 9, 2020
Modified: April 8, 2022
Error type identifier: CWE-416

Fixed packages

Package name
Branch
Fixed in version
Version from repository
Errata ID
Task #
State
firefoxsisyphus82.0.3-alt1127.0-alt1ALT-PU-2020-3254-1261456Fixed
firefoxp1082.0.3-alt1118.0.2-alt0.p10.1ALT-PU-2020-3254-1261456Fixed
firefoxp982.0.3-alt0.1.p9105.0.1-alt0.c9.1ALT-PU-2021-1152-1264322Fixed
firefoxc10f182.0.3-alt1112.0.2-alt0.p10.1ALT-PU-2020-3254-1261456Fixed
firefoxc9f293.0-alt0.p9.1105.0.1-alt0.c9.1ALT-PU-2021-3368-1288792Fixed
firefoxp1182.0.3-alt1126.0.1-alt1ALT-PU-2020-3254-1261456Fixed
firefox-esrsisyphus78.4.1-alt1115.11.0-alt1ALT-PU-2020-3257-1261479Fixed
firefox-esrp1091.1.0-alt1115.11.0-alt1ALT-PU-2021-2881-1284980Fixed
firefox-esrp978.4.1-alt0.1.p9102.11.0-alt0.c9.1ALT-PU-2020-3267-1261517Fixed
firefox-esrc10f191.1.0-alt1115.9.1-alt0.c10.1ALT-PU-2021-2881-1284980Fixed
firefox-esrc9f291.3.0-alt1.c9.1102.12.0-alt0.c9.1ALT-PU-2021-3369-1288792Fixed
firefox-esrp1178.4.1-alt1115.11.0-alt1ALT-PU-2020-3257-1261479Fixed
thunderbirdsisyphus78.4.2-alt1115.9.0-alt1ALT-PU-2020-3263-1261523Fixed
thunderbirdp1078.4.2-alt1115.9.0-alt1ALT-PU-2020-3263-1261523Fixed
thunderbirdp978.4.3-alt0.1.p9102.11.0-alt0.c9.1ALT-PU-2020-3338-1261571Fixed
thunderbirdc10f178.4.2-alt1115.9.0-alt0.c10.1ALT-PU-2020-3263-1261523Fixed
thunderbirdc9f278.7.0-alt0.1.c9102.11.0-alt0.c9.1ALT-PU-2021-1369-1264611Fixed
thunderbirdp1178.4.2-alt1115.9.0-alt1ALT-PU-2020-3263-1261523Fixed

References to Advisories, Solutions, and Tools

Hyperlink
Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=1675905
  • Exploit
  • Issue Tracking
  • Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-49/
  • Vendor Advisory
http://packetstormsecurity.com/files/166175/Firefox-MCallGetProperty-Write-Side-Effects-Use-After-Free.html
  • Exploit
  • Third Party Advisory
  • VDB Entry

    1. Configuration 1

      cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
      End excliding
      78.4.1
      cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
      End excliding
      78.4.2
      cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
      End excliding
      82.0.3
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