CVE-2017-0887 : Vulnerability Insights and Analysis

This CVE-2017-0887 article provides insights into a vulnerability in Nextcloud Server versions before 9.0.55 and 10.0.2 that allows bypassing quota limitations.

Understanding CVE-2017-0887

What is CVE-2017-0887?

A vulnerability in Nextcloud Server versions prior to 9.0.55 and 10.0.2 enables authenticated attackers to surpass user quota limits by manipulating certain HTTP header values.

The Impact of CVE-2017-0887

The vulnerability permits users to exceed their allocated storage space, potentially causing storage misuse and disrupting system administration.

Technical Details of CVE-2017-0887

Vulnerability Description

The flaw in Nextcloud Server versions before 9.0.55 and 10.0.2 allows for unauthorized quota limit circumvention by exploiting inadequately sanitized

OC-Total-Length

HTTP header values.

Affected Systems and Versions

Product: Nextcloud Server
Vendor: Nextcloud
Versions Affected: All versions before 9.0.55 and 10.0.2

Exploitation Mechanism

The vulnerability arises from the improper handling of user input within the

OC-Total-Length

HTTP header, enabling authenticated attackers to exceed their assigned storage quotas.

Mitigation and Prevention

Immediate Steps to Take

Upgrade Nextcloud Server to version 9.0.55 or 10.0.2 to mitigate the vulnerability.
Monitor user activities and storage usage to detect any unusual behavior.

Long-Term Security Practices

Regularly review and update security configurations to prevent similar bypass vulnerabilities.
Educate users on secure data storage practices and quota management.

Patching and Updates

Apply security patches promptly to address known vulnerabilities and enhance system security.