Vulnerability Name:

CVE-2021-23993 (CCN-199673)

Assigned:2021-04-08
Published:2021-04-08
Updated:2021-07-06
Summary:An attacker may perform a DoS attack to prevent a user from sending encrypted email to a correspondent. If an attacker creates a crafted OpenPGP key with a subkey that has an invalid self signature, and the Thunderbird user imports the crafted key, then Thunderbird may try to use the invalid subkey, but the RNP library rejects it from being used, causing encryption to fail. This vulnerability affects Thunderbird < 78.9.1.
CVSS v3 Severity:6.5 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N)
5.7 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): High
Availibility (A): None
6.5 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)
5.7 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
6.5 Medium (REDHAT CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N)
5.7 Medium (REDHAT Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): High
Availibility (A): None
CVSS v2 Severity:4.3 Medium (CVSS v2 Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): None
6.8 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:S/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-327
CWE-347
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2021-23993

Source: MISC
Type: Issue Tracking, Permissions Required, Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1666360

Source: XF
Type: UNKNOWN
thunderbird-cve202123993-dos(199673)

Source: CCN
Type: Mozilla Foundation Security Advisory 2021-13
Security Vulnerabilities fixed in Thunderbird 78.9.1

Source: MISC
Type: Release Notes, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2021-13/

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2021-23993

Vulnerable Configuration:Configuration 1:
  • cpe:/a:mozilla:thunderbird:*:*:*:*:*:*:*:* (Version < 78.9.1)

    • Configuration RedHat 1:
  • cpe:/o:redhat:enterprise_linux:7:*:*:*:*:*:*:*

    • Configuration RedHat 2:
  • cpe:/o:redhat:enterprise_linux:7::client:*:*:*:*:*

    • Configuration RedHat 3:
  • cpe:/o:redhat:enterprise_linux:7::server:*:*:*:*:*

    • Configuration RedHat 4:
  • cpe:/o:redhat:enterprise_linux:7::workstation:*:*:*:*:*

    • Configuration RedHat 5:
  • cpe:/a:redhat:enterprise_linux:8:*:*:*:*:*:*:*

    • Configuration RedHat 6:
  • cpe:/a:redhat:enterprise_linux:8::appstream:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:mozilla:thunderbird:78.9.0:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:645
    P
    		Security update for php7 (Moderate) (in QA)
    2022-10-04
    oval:org.opensuse.security:def:3546
    P
    		libICE6-1.0.8-12.1 on GA media (Moderate)
    2022-06-28
    oval:org.opensuse.security:def:95176
    P
    		MozillaThunderbird-91.8.0-150200.8.65.1 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:111905
    P
    		MozillaThunderbird-91.1.1-1.1 on GA media (Moderate)
    2022-01-17
    oval:org.opensuse.security:def:105478
    P
    		MozillaThunderbird-91.1.1-1.1 on GA media (Moderate)
    2021-10-01
    oval:org.opensuse.security:def:111330
    P
    		Security update for MozillaThunderbird (Important)
    2021-04-19
    oval:com.redhat.rhsa:def:20211192
    P
    		RHSA-2021:1192: thunderbird security update (Moderate)
    2021-04-14
    oval:com.redhat.rhsa:def:20211193
    P
    		RHSA-2021:1193: thunderbird security update (Moderate)
    2021-04-14
    BACK
    mozilla thunderbird *
    mozilla thunderbird 78.9.0