Home→Vulnerabilities→CVE-2021-20876
Disclosed

CVE-2021-20876

Path traversal vulnerability in GroupSession Free edition ver5.1.1 and earlier, GroupSession byCloud ver5.1.1 and earlier, and GroupSession ZION ver5.1.1 and earlier allows an attacker with an administrative privilege to obtain sensitive information stored in the hierarchy above the directory on the published site's server via unspecified vectors.

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Exploitation Probability (EPSS)

Low Priority
0.23%

The Exploit Prediction Scoring System (EPSS) uses machine learning to estimate the probability that a vulnerability will be exploited in the wild within the next 30 days.

0% (Theoretical)100% (Certainty)

7-Day Exploitation Trend

Vulnerability Timeline

2 events
Dec 24, 2021
Vulnerability Disclosed
Published to component-level vulnerability database.
Jan 10, 2022
Last Updated
Record updated with new analysis or tags.

Threat Actor Attribution

PREMIUM INTEL
Associated Groups:Lazarus Group, APT28
Ransomware Campaigns:LockBit 3.0, BlackCat
IoCs (Indicators):14 IPs, 3 Hashes

Remediation & Mitigation

SOLUTION

Official patches and mitigation steps are available for this vulnerability.

# Update Command
apt-get update && apt-get upgrade -y specific-package
# Verify installation
dpkg -l | grep package-name

Affected Products

1 Total
groupsession/groupsessionAll Versions

References

https://groupsession.jp/info/info-news/security20211220Groupsession
Vendor Advisory
https://jvn.jp/en/jp/JVN79798166/index.htmlJvn
Third Party Advisory

Am I Vulnerable?

Check your domain or package.json for CVE-2021-20876 exposure.

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Vulnerability Details

CVSS Base Score
6.8/ 10
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
Published Date
Dec 24, 2021
Last Modified
Jan 10, 2022
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