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CVE-2020-15253 : Security Advisory and Response

Learn about CVE-2020-15253, a Stored XSS vulnerability in Grocy <= 2.7.1. Understand the impact, affected systems, exploitation mechanism, and mitigation steps to prevent attacks.

Versions of Grocy <= 2.7.1 are vulnerable to Cross-Site Scripting via the Create Shopping List module, which is rendered upon deleting that Shopping List. This vulnerability requires authentication to exploit and should not be publicly exposed. The impact includes high confidentiality, integrity, and privilege requirements.

Understanding CVE-2020-15253

Stored XSS vulnerability in Grocy affecting versions <= 2.7.1.

What is CVE-2020-15253?

CVE-2020-15253 is a Cross-Site Scripting vulnerability in Grocy versions <= 2.7.1, allowing attackers to execute malicious scripts in the context of a user's session.

The Impact of CVE-2020-15253

        Attack Complexity: High
        Attack Vector: Network
        Base Score: 7.3 (High)
        Confidentiality, Integrity, and Privileges Required: High
        User Interaction: Required
        Scope: Changed
        Vector String: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:N

Technical Details of CVE-2020-15253

Stored XSS vulnerability in Grocy.

Vulnerability Description

        Vulnerable to Cross-Site Scripting via the Create Shopping List module.
        Authentication is required to exploit the issues.

Affected Systems and Versions

        Product: Grocy
        Vendor: Grocy
        Versions Affected: <= 2.7.1
        Vulnerable modules: users, batteries, chores, equipment, locations, quantity units, shopping locations, tasks, task categories, product groups, recipes, and products.

Exploitation Mechanism

        Attackers can exploit the vulnerability by manipulating input in the Create Shopping List module.

Mitigation and Prevention

Steps to address and prevent the CVE-2020-15253 vulnerability.

Immediate Steps to Take

        Update Grocy to version > 2.7.1 to mitigate the vulnerability.
        Avoid exposing Grocy to the public internet.

Long-Term Security Practices

        Regularly monitor and apply security patches to Grocy.
        Conduct security assessments to identify and address vulnerabilities.

Patching and Updates

        Apply the latest patches and updates provided by Grocy to fix the vulnerability.

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