An issue was discovered in ownCloud owncloud/core before 10.13.1. An attacker can access, modify, or delete any file without authentication if the username of a victim is known, and the victim has no signing-key configured. This occurs because pre-signed URLs can be accepted even when no signing-key is configured for the owner of the files. The earliest affected version is 10.6.0.

The version of ownCloud installed on the remote host is prior to 10.13.3. It is, therefore, affected by multiple vulnerabilities:

  - An issue was discovered in ownCloud owncloud/graphapi The graphapi app relies on a third-party GetPhpInfo.php     library that provides a URL. When this URL is accessed, it reveals the configuration details of the PHP environment     (phpinfo). This information includes all the environment variables of the webserver. In containerized deployments,     these environment variables may include sensitive data such as the ownCloud admin password, mail server credentials,     and license key. Simply disabling the graphapi app does not eliminate the vulnerability. Additionally, phpinfo exposes     various other potentially sensitive configuration details that could be exploited by an attacker to gather information     about the system. Therefore, even if ownCloud is not running in a containerized environment, this vulnerability should     still be a cause for concern (CVE-2023-49103)

  - An issue was discovered in ownCloud owncloud/oauth2 when Allow Subdomains is enabled. An attacker is able to pass in a     crafted redirect-url that bypasses validation, and consequently allows an attacker to redirect callbacks to a Top Level     Domain controlled by the attacker. (CVE-2023-49104)

  - An issue was discovered in ownCloud owncloud/core. An attacker can access, modify, or delete any file without authentication     if the username of a victim is known, and the victim has no signing-key configured. This occurs because pre-signed URLs can     be accepted even when no signing-key is configured for the owner of the files. (CVE-2023-49105)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

An Authentication Bypass was discovered in OwnCloud 10.6.x prior to 10.13.1 in the WebDAV protocol. An unauthenticated attacker can access, modify or delete any file if a victim's username is known and the victim has no signing key configured because pre-signed URLs can be accepted even if no signing key is configured for the file owner (default case).

ID	Name	Product	Family	Type	Severity
189276	ownCloud Server < 10.13.3 Multiple Vulnerabilities	Nessus	CGI abuses	Combined	critical
114118	OwnCloud 10.6.x < 10.13.1 WebDav Authentication Bypass	Web App Scanning	Component Vulnerability	Check Based	critical

Detections

Analytics

CVE-2023-49105

critical

Tenable Plugins

critical

critical