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Advisories

LibreSSL through 4.4.0 CRLF Injection via OCSP_sendreq_new() Request Line

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Severity
medium
Date
Affecting

  • LibreSSL <= 4.4.0

CWE
  • CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection')
CVSS
6.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Credit
Aziz Elbelaychy (Ostorlab), Theo Buehler
Description
LibreSSL through 4.4.0 contains a CRLF injection vulnerability in the libcrypto OCSP_sendreq_new() and OCSP_parse_url() functions, which write unvalidated request paths into the OCSP POST request line. Attackers can embed carriage return and line feed characters in a certificate's Authority Information Access OCSP URI to inject HTTP headers or split requests sent to responders and proxies.

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