CSSOM through 0.5.0 contains a denial of service vulnerability in CSSStyleDeclaration.setProperty() that fails to validate reserved property names. Attackers can supply a stylesheet with a declaration named length to replace the internal counter and trigger excessive memory allocation during cssText serialization, causing process termination.
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)
References 5
https://github.com/NV/CSSOM
disclosure@vulncheck.com
https://github.com/NV/CSSOM/blob/00ec21868e12422581c81779135c2f1648441204/lib/C…
disclosure@vulncheck.com
https://github.com/NV/CSSOM/blob/00ec21868e12422581c81779135c2f1648441204/lib/C…
disclosure@vulncheck.com
https://github.com/NV/CSSOM/issues/119
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/cssom-through-0.5.0-denial-of-service-via-…
disclosure@vulncheck.com