Kagemai vulnerable to cross-site request forgery


Kagemai <http://www.daifukuya.com/kagemai/> provided by daifukuya.com is a bug tracking system to share bug information of the software being developed among its development team.
Kagemai contains a cross-site request forgery vulnerability (CWE-352) which allows unintended operations if a user with an administrative privilege views a malicious page while logged.

During the meeting of Committee for authorizing the disclosure of unresolved vulnerabilities held on January 22, 2021, it was judged that an advisory for this vulnerability shall be disclosed since all the criteria and conditions described below which are stated in Standards for Handling Vulnerability related Information of Software Products and Other and Information Security Early Warning Partnership Guideline have been satisfied.

1. The developer of the product is unreachable.
2. Existence of vulnerability has been verified.
3. Not disclosing this case may result in the risk that product users will have no means to know of the existence of the vulnerability in the product.
4. There are no particular reasons that would make disclosure inappropriate:
CVSS Severity (What is CVSS?)

CVSS V3 Severity:
Base Metrics 4.3 (Medium) [IPA Score]
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Unchanged
  • Confidentiality Impact: Low
  • Integrity Impact: None
  • 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
Affected Products

  • kagemai 0.8.8

The above is the version reproduced the vulnerability by IPA based on the information provided.

If a user with an administrative privilege views a malicious page while logged in, unintended operations may be performed.

[Consider stop using Kagemai 0.8.8]
Since the developer was unreachable, existence of any mitigations is unknown.
Vendor Information

CWE (What is CWE?)

  1. Cross-Site Request Forgery(CWE-352) [IPA Evaluation]
CVE (What is CVE?)

  1. CVE-2021-20687

  1. JVN : JVN#11438679
  2. National Vulnerability Database (NVD) : CVE-2021-20687
Revision History

  • [2021/03/25]
      Web page was published