CVE-2019-15302 in CryptPad
Summary
by MITRE
The pad management logic in XWiki labs CryptPad before 3.0.0 allows a remote attacker (who has access to a Rich Text pad with editing rights for the URL) to corrupt it (i.e., cause data loss) via a trivial URL modification.
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Analysis
by VulDB Data Team • 12/19/2023
The vulnerability identified as CVE-2019-15302 affects XWiki labs CryptPad versions prior to 3.0.0, specifically targeting the pad management logic implementation. This security flaw represents a critical access control weakness that allows remote attackers to manipulate document integrity through simple URL modifications. The vulnerability specifically impacts Rich Text pads where the attacker possesses editing rights, creating a scenario where unauthorized data corruption can occur through trivial manipulation of the Uniform Resource Locator.
The technical flaw stems from insufficient input validation and improper access control mechanisms within the pad management system. When an attacker with editing privileges accesses a Rich Text pad, the application fails to properly validate URL parameters that could alter the pad's state or content. This weakness enables the attacker to modify URL parameters in a way that triggers unintended behavior within the application's pad management logic, ultimately resulting in data corruption or loss. The vulnerability operates at the application layer, specifically within the web application's resource management and access control components.
The operational impact of this vulnerability extends beyond simple data loss scenarios to encompass potential data integrity compromise and service disruption. Remote attackers can exploit this weakness without requiring complex attack vectors or elevated privileges, making it particularly dangerous in collaborative environments where multiple users have editing rights. The trivial nature of the URL modification required means that even casual users with minimal technical expertise can potentially cause significant damage to shared documents, undermining the trust and reliability of the collaborative platform. This vulnerability directly affects the availability and integrity aspects of the CIA triad, potentially leading to business continuity issues and loss of confidence in the platform's security.
Organizations utilizing CryptPad versions prior to 3.0.0 should immediately implement the available security patches and updates provided by the vendor to remediate this vulnerability. Additionally, implementing network segmentation and access control measures can help limit the potential impact of such attacks by restricting access to sensitive pads and monitoring URL modifications. The vulnerability aligns with CWE-284 (Improper Access Control) and may be related to ATT&CK techniques involving privilege escalation and data manipulation. Administrators should also consider implementing web application firewalls and monitoring solutions to detect and prevent unauthorized URL parameter modifications that could trigger this vulnerability. Regular security assessments and penetration testing should be conducted to identify similar access control weaknesses in other collaborative applications and web platforms.