[Japanese]

JVNDB-2021-000079

Multiple cross-site scripting vulnerabilities in Movable Type

Overview

Movable Type provided by Six Apart Ltd. contains multiple cross-site scripting vulnerabilities listed below.
* Cross-site scripting vulnerability in Search screen (CWE-79) - CVE-2021-20808
* Cross-site scripting vulnerability in Create screens of Entry, Page, and Content Type (CWE-79) - CVE-2021-20809
* Cross-site scripting vulnerability in Website Management screen (CWE-79) - CVE-2021-20810
* Cross-site scripting vulnerability in List of Assets screen (CWE-79) - CVE-2021-20811
* Cross-site scripting vulnerability in Setting screen of Server Sync (CWE-79) - CVE-2021-20812
* Cross-site scripting vulnerability in Edit screen of Content Data (CWE-79) - CVE-2021-20813
* Cross-site scripting vulnerability in Setting screen of ContentType Information Widget Plugin (CWE-79) - CVE-2021-20814
* Cross-site scripting vulnerability in Edit Boilerplate screen (CWE-79) - CVE-2021-20815

Six Apart Ltd. reported these vulnerabilities to JPCERT/CC to notify users of the solutions through JVN. JPCERT/CC and Six Apart Ltd. coordinated under the Information Security Early Warning Partnership.
CVSS Severity (What is CVSS?)

CVSS V3 Severity:
Base Metrics 6.1 (Medium) [IPA Score]
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Changed
  • Confidentiality Impact: Low
  • Integrity Impact: Low
  • Availability Impact: None
CVSS V2 Severity:
Base Metrics 2.6 (Low) [IPA Score]
  • Access Vector: Network
  • Access Complexity: High
  • Authentication: None
  • Confidentiality Impact: None
  • Integrity Impact: Partial
  • Availability Impact: None
The above CVSS base scores have been assigned for CVE-2021-20808

CVSS V3 Severity:
Base Metrics: 6.1 (Medium) [IPA Score]
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Changed
  • Confidentiality Impact: Low
  • Integrity Impact: Low
  • Availability Impact: None
CVSS V2 Severity:
Base Metrics: 2.6 (Low) [IPA Score]
  • Access Vector: Network
  • Access Complexity: High
  • Authentication: None
  • Confidentiality Impact: None
  • Integrity Impact: Partial
  • Availability Impact: None
The above CVSS base scores have been assigned for CVE-2021-20809

CVSS V3 Severity:
Base Metrics: 6.1 (Medium) [IPA Score]
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Changed
  • Confidentiality Impact: Low
  • Integrity Impact: Low
  • Availability Impact: None
CVSS V2 Severity:
Base Metrics: 2.6 (Low) [IPA Score]
  • Access Vector: Network
  • Access Complexity: High
  • Authentication: None
  • Confidentiality Impact: None
  • Integrity Impact: Partial
  • Availability Impact: None
The above CVSS base scores have been assigned for CVE-2021-20810

CVSS V3 Severity:
Base Metrics: 6.1 (Medium) [IPA Score]
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Changed
  • Confidentiality Impact: Low
  • Integrity Impact: Low
  • Availability Impact: None
CVSS V2 Severity:
Base Metrics: 2.6 (Low) [IPA Score]
  • Access Vector: Network
  • Access Complexity: High
  • Authentication: None
  • Confidentiality Impact: None
  • Integrity Impact: Partial
  • Availability Impact: None
The above CVSS base scores have been assigned for CVE-2021-20811

CVSS V3 Severity:
Base Metrics: 6.1 (Medium) [IPA Score]
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Changed
  • Confidentiality Impact: Low
  • Integrity Impact: Low
  • Availability Impact: None
CVSS V2 Severity:
Base Metrics: 2.6 (Low) [IPA Score]
  • Access Vector: Network
  • Access Complexity: High
  • Authentication: None
  • Confidentiality Impact: None
  • Integrity Impact: Partial
  • Availability Impact: None
The above CVSS base scores have been assigned for CVE-2021-20812

CVSS V3 Severity:
Base Metrics: 6.1 (Medium) [IPA Score]
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Changed
  • Confidentiality Impact: Low
  • Integrity Impact: Low
  • Availability Impact: None
CVSS V2 Severity:
Base Metrics: 2.6 (Low) [IPA Score]
  • Access Vector: Network
  • Access Complexity: High
  • Authentication: None
  • Confidentiality Impact: None
  • Integrity Impact: Partial
  • Availability Impact: None
The above CVSS base scores have been assigned for CVE-2021-20813

CVSS V3 Severity:
Base Metrics: 6.1 (Medium) [IPA Score]
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Changed
  • Confidentiality Impact: Low
  • Integrity Impact: Low
  • Availability Impact: None
CVSS V2 Severity:
Base Metrics: 2.6 (Low) [IPA Score]
  • Access Vector: Network
  • Access Complexity: High
  • Authentication: None
  • Confidentiality Impact: None
  • Integrity Impact: Partial
  • Availability Impact: None
The above CVSS base scores have been assigned for CVE-2021-20814

CVSS V3 Severity:
Base Metrics: 6.1 (Medium) [IPA Score]
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Changed
  • Confidentiality Impact: Low
  • Integrity Impact: Low
  • Availability Impact: None
CVSS V2 Severity:
Base Metrics: 2.6 (Low) [IPA Score]
  • Access Vector: Network
  • Access Complexity: High
  • Authentication: None
  • Confidentiality Impact: None
  • Integrity Impact: Partial
  • Availability Impact: None
The above CVSS base scores have been assigned for CVE-2021-20815
Affected Products


Six Apart, Ltd.
  • Movable Type 7 r.4903 and earlier (Movable Type 7 Series) (CVE-2021-20808, CVE-2021-20809, CVE-2021-20810, CVE-2021-20811, CVE-2021-20813, CVE-2021-20814, CVE-2021-20815)
  • Movable Type 6.8.0 and earlier (Movable Type 6 Series) (CVE-2021-20808, CVE-2021-20809, CVE-2021-20810, CVE-2021-20811, CVE-2021-20815)
  • Movable Type Advanced 7 r.4903 and earlier (Movable Type Advanced 7 Series) (CVE-2021-20808, CVE-2021-20809, CVE-2021-20810, CVE-2021-20811, CVE-2021-20812, CVE-2021-20813, CVE-2021-20814, CVE-2021-20815)
  • Movable Type Premium 1.44 and earlier (CVE-2021-20808, CVE-2021-20809, CVE-2021-20810, CVE-2021-20811, CVE-2021-20814, CVE-2021-20815)
  • Movable Type Premium Advanced 1.44 and earlier (CVE-2021-20808, CVE-2021-20809, CVE-2021-20810, CVE-2021-20811, CVE-2021-20812, CVE-2021-20815)

Impact

An arbitrary script may be executed on a logged-in user's web browser.
Solution

[Update the software]
Update the software to the latest version according to the information provided by the developer.
Vendor Information

Six Apart, Ltd.
CWE (What is CWE?)

  1. Cross-site Scripting(CWE-79) [IPA Evaluation]
CVE (What is CVE?)

  1. CVE-2021-20808
  2. CVE-2021-20809
  3. CVE-2021-20810
  4. CVE-2021-20811
  5. CVE-2021-20812
  6. CVE-2021-20813
  7. CVE-2021-20814
  8. CVE-2021-20815
References

  1. JVN : JVN#97545738
Revision History

  • [2021/08/25]
      Web page was published

Date Public2021/08/25
Date First Published2021/08/25
Date Last Updated2021/08/25