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Advisories

LibreSSL ocspcheck through 4.4.0 Cleartext Transmission of OCSP Requests via url2host()

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Severity
medium
Date
Affecting

  • LibreSSL <= 4.4.0

CWE
  • CWE-319 Cleartext Transmission of Sensitive Information
CVSS
6.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Credit
Aziz Elbelaychy (Ostorlab), Kenjiro Nakayama
Description
LibreSSL ocspcheck through 4.4.0 contains a cleartext transmission vulnerability because url2host() discards the OCSP URL scheme and http_alloc() only selects TLS for port 443. On-path network attackers can read OCSP requests sent to https responder URLs on non-443 ports, exposing certificate serial numbers, issuer hashes, and nonces.

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