CVE Vulnerabilities


Improper Restriction of XML External Entity Reference

Published: Feb 20, 2023 | Modified: Mar 01, 2023
CVSS 3.x
CVSS 2.x
5.3 LOW

A vulnerability was found in 3breadt dd-plist 1.17 and classified as problematic. Affected by this issue is some unknown functionality. The manipulation leads to xml external entity reference. An attack has to be approached locally. Upgrading to version 1.18 is able to address this issue. The name of the patch is 8c954e8d9f6f6863729e50105a8abf3f87fff74c. It is recommended to upgrade the affected component. VDB-221486 is the identifier assigned to this vulnerability.


The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.

Affected Software

Name Vendor Start Version End Version
Dd-plist Dd-plist_project * *

Extended Description

XML documents optionally contain a Document Type Definition (DTD), which, among other features, enables the definition of XML entities. It is possible to define an entity by providing a substitution string in the form of a URI. The XML parser can access the contents of this URI and embed these contents back into the XML document for further processing. By submitting an XML file that defines an external entity with a file:// URI, an attacker can cause the processing application to read the contents of a local file. For example, a URI such as “file:///c:/winnt/win.ini” designates (in Windows) the file C:\Winnt\win.ini, or file:///etc/passwd designates the password file in Unix-based systems. Using URIs with other schemes such as http://, the attacker can force the application to make outgoing requests to servers that the attacker cannot reach directly, which can be used to bypass firewall restrictions or hide the source of attacks such as port scanning. Once the content of the URI is read, it is fed back into the application that is processing the XML. This application may echo back the data (e.g. in an error message), thereby exposing the file contents.

Potential Mitigations