[Japanese]

JVNDB-2021-000070

Multiple vulnerabilities in GroupSession

Overview

GroupSession provided by Japan Total System Co.,Ltd. contains multiple vulnerabilities listed below.
*Cross-site scripting vulnerability (CWE-79) - CVE-2021-20785
*Cross-site request forgery (CWE-352) - CVE-2021-20786
*Cross-site scripting vulnerability (CWE-79) - CVE-2021-20787
*Sever-side request forgery (CWE-918) - CVE-2021-20788
*Open redirect (CWE-601) - CVE-2021-20789

CVE-2021-20785, CVE-2021-20786
ASAI Ken reported these vulnerabilities to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.

CVE-2021-20787, CVE-2021-20788, CVE-2021-20789
Ryo Sato of BroadBand Security,Inc. reported these vulnerabilities to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.
CVSS Severity (What is CVSS?)

CVSS V3 Severity:
Base Metrics 5.0 (Medium) [IPA Score]
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: Low
  • User Interaction: None
  • Scope: Changed
  • Confidentiality Impact: Low
  • Integrity Impact: None
  • Availability Impact: None
CVSS V2 Severity:
Base Metrics 4.0 (Medium) [IPA Score]
  • Access Vector: Network
  • Access Complexity: Low
  • Authentication: Single Instance
  • Confidentiality Impact: Partial
  • Integrity Impact: None
  • Availability Impact: None
The above CVSS base scores have been assigned for CVE-2021-20788

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-2021-20785

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: None
  • 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-2021-20786

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-2021-20787

CVSS V3 Severity:
Base Metrics: 4.7 (Medium) [IPA Score]
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Changed
  • Confidentiality Impact: None
  • 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-2021-20789
Affected Products


Japan Total System Co.,Ltd.
  • GroupSession Free edition from ver2.2.0 to the version prior to ver5.1.0
  • GroupSession byCloud from ver3.0.3 to the version prior to ver5.1.0
  • GroupSession ZION from ver3.0.3 to the version prior to ver5.1.0

Impact

The expected impact depends on each vulnerability, but it may be affected as follows.
*If a user sends a specially crafted request to a specific URL while logged in to the product with an administrative account, an arbitrary script may be executed - CVE-2021-20785, CVE-2021-20787
*If a user accesses a specially crafted URL while logged in to the product with an administrative account, the product's settings may be changed unintentionally - CVE-2021-20786
*A user who can access the bookmark function of the software may conduct a port scan from the product and/or obtain information from the internal Web server - CVE-2021-20788
*When accessing a specially crafted URL, the user may be redirected to an arbitrary website. As a result, the user may become a victim of a phishing attack - CVE-2021-20789
Solution

[Update the software]
Update the software to the latest version according to the information provided by the developer.
The developer has released the fixed version ver5.1.0.
Vendor Information

Japan Total System Co.,Ltd.
CWE (What is CWE?)

  1. Cross-Site Request Forgery(CWE-352) [IPA Evaluation]
  2. Cross-site Scripting(CWE-79) [IPA Evaluation]
  3. No Mapping(CWE-Other) [IPA Evaluation]
CVE (What is CVE?)

  1. CVE-2021-20785
  2. CVE-2021-20786
  3. CVE-2021-20787
  4. CVE-2021-20788
  5. CVE-2021-20789
References

  1. JVN : JVN#86026700
  2. National Vulnerability Database (NVD) : CVE-2021-20785
  3. National Vulnerability Database (NVD) : CVE-2021-20786
  4. National Vulnerability Database (NVD) : CVE-2021-20787
  5. National Vulnerability Database (NVD) : CVE-2021-20788
  6. National Vulnerability Database (NVD) : CVE-2021-20789
Revision History

  • [2021/07/19]
      Web page was published
  • [2023/03/08]
      Overview was modified

Date Public2021/07/19
Date First Published2021/07/19
Date Last Updated2023/03/08