CVE-2021-25317 : Vulnerability Insights and Analysis

A vulnerability in the packaging of cups in multiple SUSE and openSUSE products allows local attackers to create files as root with elevated permissions. Immediate patching and security measures are advised.

Understanding CVE-2021-25317

This CVE highlights an Incorrect Default Permissions issue in cups packaging across various SUSE and openSUSE products, enabling unauthorized creation of files as root.

What is CVE-2021-25317?

The vulnerability allows local attackers with control over the lp user to create files as root with elevated permissions without permission to modify content. It impacts specific versions of SUSE Linux Enterprise Server, SUSE Manager Server, SUSE OpenStack Cloud Crowbar, openSUSE Leap, and openSUSE Factory.

The Impact of CVE-2021-25317

Exploitation of this vulnerability could lead to unauthorized manipulation of critical system files and potential privilege escalation, posing a significant security risk to affected systems.

Technical Details of CVE-2021-25317

The vulnerability arises from incorrect default permissions in cups packaging, enabling local lp users to create files as root with elevated permissions but no content modification capabilities.

Vulnerability Description

Affected versions of cups in SUSE and openSUSE products allow lp users to create files as root without appropriate checks, leading to potential system compromise.

Affected Systems and Versions

Products impacted include SUSE Linux Enterprise Server 11-SP4-LTSS, SUSE Manager Server 4.0, SUSE OpenStack Cloud Crowbar 9, openSUSE Leap 15.2, and openSUSE Factory, with specific cups versions vulnerable.

Exploitation Mechanism

Local attackers can exploit this vulnerability by leveraging the lp user's control to create files with root privileges and elevated permissions, threatening system integrity.

Mitigation and Prevention

Given the severity of this vulnerability, immediate action is necessary to mitigate risks and enhance system security.

Immediate Steps to Take

Ensure prompt patching of cups to the recommended versions or apply vendor-supplied fixes to prevent unauthorized file creation as root.

Long-Term Security Practices

Implement least privilege policies, regular security assessments, and access controls to limit potential attack vectors and enhance system resilience.

Patching and Updates

Regularly monitor vendor security advisories and update to the latest cups versions to address known vulnerabilities and strengthen system defenses.