CVE-2023-49105 Scanner

OwnCloud is widely used by organizations and individuals for file sharing and synchronization across various devices. It serves as a self-hosted cloud storage that supports collaborative sharing, often replacing third-party cloud services. It is used in environments where data security and privacy are paramount, offering functionalities similar to Dropbox or Google Drive but with private hosting. Companies utilize ownCloud to ensure data remains under their control, which can be crucial for legal compliance. It is popular among those prioritizing open-source solutions and in contexts where data sovereignty is critical. Overall, ownCloud is recognized for its flexible deployment options across different platforms.

The Unauthorized Admin Access vulnerability allows attackers to access the administrative interface without proper credentials. This critical flaw bypasses authentication mechanisms when specific client configurations are absent, enabling malicious users to conduct a variety of unauthorized actions. The potential misuse includes accessing, modifying, or deleting files without owner consent if a pre-signed URL is exploited. Attackers with knowledge of specific accounts can exploit this to escalate privileges and conduct harmful activities unnoticed. This type of breach reflects a weakness in the product's authentication protocol, emphasizing the need for enhanced security measures. Ultimately, it presents severe implications for data confidentiality, integrity, and availability.

The vulnerability is linked to issues in how the ownCloud WebDAV API handles authentication, particularly when dealing with pre-signed URLs. Specifically, if a user's account lacks a signing-key, the API might inadvertently grant access with insufficient verification checks. The flaw allows a properly crafted request to exploit a default or empty signing-key situation, leading to unauthorized data access. An attack vector involves manipulating URL parameters to trick the server into granting full access rights. By harnessing predictable endpoint patterns, attackers can manipulate request headers and parameters to generate valid, albeit unauthorized, session tokens. This manifests as a severe breakdown in the system's fundamental security controls, underscoring the gravity of the vulnerability.

Exploitation of this vulnerability can lead to significant security implications. Attackers may gain unauthorized access to sensitive information, leading to data breaches with potential legal repercussions. Compromise of administrative control could allow for unauthorized configuration changes, user account manipulation, and disruption of normal service operations. The breach compromises user trust, damages organizational reputation, and may incur substantial recovery costs. Beyond financial losses, it may result in service availability issues or total denial of service. Thus, securing systems against this vulnerability is crucial to maintaining operational integrity and trustworthiness.

REFERENCES

• https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/
• https://github.com/0xfed/ownedcloud
• https://owncloud.org/security
• https://github.com/ambionics/owncloud-exploits
• https://github.com/nomi-sec/PoC-in-GitHub