[Japanese]

JVNDB-2021-000017

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 Role authority setting screen (CWE-79) - CVE-2021-20663
*Cross-site scripting vulnerability in Asset registration screen (CWE-79) - CVE-2021-20664
*Cross-site scripting vulnerability in Add asset screen of Contents field (CWE-79) - CVE-2021-20665

Six Apart Ltd. reported these vulnerabilities to JPCERT/CC to notify users of its solution 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-2021-20663

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-2021-20664

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-2021-20665
Affected Products


Six Apart, Ltd.
  • Movable Type 7 r.4705 and earlier (Movable Type 7 Series) (CVE-2021-20663, CVE-2021-20664, CVE-2021-20665)
  • Movable Type 6.7.5 and earlier (Movable Type 6.7 Series) (CVE-2021-20663, CVE-2021-20664)
  • Movable Type Advanced 7 r.4705 and earlier (Movable Type Advanced 7 Series) (CVE-2021-20663, CVE-2021-20664, CVE-2021-20665)
  • Movable Type Premium 1.39 and earlier (CVE-2021-20663, CVE-2021-20664, CVE-2021-20665)
  • Movable Type Premium Advanced 1.39 and earlier (CVE-2021-20663, CVE-2021-20664, CVE-2021-20665)

Impact

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

[Update the software]
Update 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-2021-20663
  2. CVE-2021-20664
  3. CVE-2021-20665
References

  1. JVN : JVN#66542874
  2. National Vulnerability Database (NVD) : CVE-2021-20663
  3. National Vulnerability Database (NVD) : CVE-2021-20664
  4. National Vulnerability Database (NVD) : CVE-2021-20665
Revision History

  • [2021/02/24]
      Web page was published

Date Public2021/02/24
Date First Published2021/02/24
Date Last Updated2021/02/24