Vulnerability Name:

CVE-2021-21809 (CCN-204339)

Assigned:2021-06-22
Published:2021-06-22
Updated:2022-08-24
Summary:A command execution vulnerability exists in the default legacy spellchecker plugin in Moodle 3.10. A specially crafted series of HTTP requests can lead to command execution. An attacker must have administrator privileges to exploit this vulnerabilities.
CVSS v3 Severity:9.1 Critical (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H)
8.6 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:F/RL:W/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): High
User Interaction (UI): None
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
8.2 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:L)
7.8 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:L/E:F/RL:W/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): High
User Interaction (UI): None
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): High
Integrity (I): Low
Availibility (A): Low
CVSS v2 Severity:9.0 High (CVSS v2 Vector: AV:N/AC:L/Au:S/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
8.0 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:S/C:C/I:P/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Partial
Availibility (A): Partial
Vulnerability Consequences:Gain Access
References:Source: MITRE
Type: CNA
CVE-2021-21809

Source: MISC
Type: Exploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/164481/Moodle-SpellChecker-Path-Authenticated-Remote-Command-Execution.html

Source: XF
Type: UNKNOWN
moodle-cve202121809-cmd-exec(204339)

Source: CCN
Type: Moodle Web site
Moodle - Open-source learning platform | Moodle.org

Source: CCN
Type: Packet Storm Security [10-12-2021]
Moodle SpellChecker Path Authenticated Remote Command Execution

Source: CCN
Type: Talos Vulnerability Report TALOS-2021-1277
Moodle spellchecker plugin command execution vulnerability

Source: MISC
Type: Third Party Advisory, Exploit
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1277

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2021-21809

Vulnerable Configuration:Configuration 1:
  • cpe:/a:moodle:moodle:3.10.0:-:*:*:*:*:*:*

  • Configuration CCN 1:
  • cpe:/a:moodle:moodle:3.10:*:*:*:*:*:*:*

  • * Denotes that component is vulnerable
    BACK
    moodle moodle 3.10.0 -
    moodle moodle 3.10