http-cache-semantics through 4.2.0 contains a cache validation vulnerability in the _varyMatches() function that fails to properly validate Vary header wildcards due to byte-for-byte string comparison. Attackers can request URLs previously fetched by other clients to receive cached responses intended for different users, disclosing sensitive information across clients.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
High
Difficult 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
None
No data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 4
https://github.com/kornelski/http-cache-semantics
disclosure@vulncheck.com
https://github.com/kornelski/http-cache-semantics/blob/f01112e954b83cfa8765b633…
disclosure@vulncheck.com
https://github.com/kornelski/http-cache-semantics/issues/57
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/http-cache-semantics-through-4.2.0-cross-c…
disclosure@vulncheck.com