Libxml2 expand remote dtd
libxml2-expand-remote-dtd
libxml2-expand-remote-dtd
The application is using an XML parser that has not been safely configured. This might lead to XML External Entity (XXE) vulnerabilities when parsing user-controlled input. An attacker can include document type definitions (DTDs) or XIncludes which can interact with internal or external hosts. XXE can lead to other vulnerabilities, such as Local File Inclusion (LFI), Remote Code Execution (RCE), and Server-side request forgery (SSRF), depending on the application configuration. An attacker can also use DTDs to expand recursively, leading to a Denial-of-Service (DoS) attack, also known as a Billion Laughs Attack. If DTD is required for local files then pass the XML_PARSE_NONET option which will disable network access.
Likelihood: MEDIUM
Confidence: MEDIUM
CWE:
- CWE-611: Improper Restriction of XML External Entity Reference
OWASP:
- A04:2017 - XML External Entities (XXE)
- A05:2021 - Security Misconfiguration