Mammoth.js 1.3.0 before 1.12.3 contains a regular expression denial of service vulnerability in the style map tokeniser in lib/styles/parser/tokeniser.js due to overlapping regex alternatives. Attackers can supply a crafted .docx with an unterminated quoted string of repeated backslash escapes in mammoth/style-map to block the Node.js event loop.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products
mwilliamson:mammoth.js
References 5
https://github.com/mwilliamson/mammoth.js
disclosure@vulncheck.com
https://github.com/mwilliamson/mammoth.js/blob/1.12.2/lib/styles/parser/tokenis…
disclosure@vulncheck.com
https://github.com/mwilliamson/mammoth.js/commit/dc49225425c2c07de0a6dc3529f238…
disclosure@vulncheck.com
https://github.com/mwilliamson/mammoth.js/issues/487
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/mammoth-js-1.3.0-before-1.12.3-redos-via-s…
disclosure@vulncheck.com