mammoth (aka mammoth.js) before 1.12.2 is vulnerable to prototype pollution when reading the styles defined in a document. Converting a crafted .docx file allows an attacker to add arbitrary properties to Object.prototype. In 1.11.0 through 1.12.1, applications that convert further documents in the same process and return the converted HTML can also disclose the contents of local server files (to the party supplying the documents) by setting externalFileAccess to true.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
Low
Partial data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 4
https://github.com/mwilliamson/mammoth.js/commit/2888fa158d67c1419199f152326e12…
cve@mitre.org
https://github.com/mwilliamson/mammoth.js/commit/31f0c370be4b95ac4fa285fea3be97…
cve@mitre.org
https://raw.githubusercontent.com/mwilliamson/mammoth.js/master/NEWS
cve@mitre.org
https://www.npmjs.com/package/mammoth
cve@mitre.org