LibreSSL through 4.4.0 CRLF Injection via OCSP_sendreq_new() Request Line
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fix or patch referenced
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
LibreSSL, an open-source cryptographic library, is affected by this flaw in its certificate status checking (OCSP) code. An attacker who can supply a malicious OCSP URL in a certificate could inject extra HTTP headers or split requests sent to certificate responders and proxies.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original 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.
Timeline
- CVE published
- First seen by cve.now
Affected versions
- OpenBSD LibreSSL
through 4.4.0