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Advisories

http-cache-semantics through 4.2.0 Cross-Client Cache Disclosure via Vary Wildcard

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severity
high
date
Affecting

  • http-cache-semantics <= 4.2.0

CWE
  • CWE-436 Interpretation Conflict
CVSS
8.2
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Credit
Wayde Shi (PayPal Cyber Security Team)
Description
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.

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