CVE-2015-1793 – OpenSSL - Alternative Chains Certificate Forgery

https://notcve.org/view.php?id=CVE-2015-1793

The X509_verify_cert function in crypto/x509/x509_vfy.c in OpenSSL 1.0.1n, 1.0.1o, 1.0.2b, and 1.0.2c does not properly process X.509 Basic Constraints cA values during identification of alternative certificate chains, which allows remote attackers to spoof a Certification Authority role and trigger unintended certificate verifications via a valid leaf certificate. La función de verificación de certificado X509 en crypto/x509/x509_vfy.c en OpenSSL 1.0.1n, 1.0.1o, 1.0.2b, y 1.0.2c no procesa correctamente los valores cA de restricción básica del X.509 durante la identificación de cadenas de certificado alternativo, lo que permite a atacantes remotos suplantar una función de autoridad de certificación y propiciar verificaciones de certificado involuntarias a través de un leaf certificate válido. • https://www.exploit-db.com/exploits/38640 http://fortiguard.com/advisory/2015-07-09-cve-2015-1793-openssl-alternative-chains-certificate-forgery http://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2015-008.txt.asc http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10694 http://lists.fedoraproject.org/pipermail/package-announce/2015-July/161747.html http://lists.fedoraproject.org/pipermail/package-announce/2015-July/161782.html http://marc.info/?l=bugtraq&m=143880121627664&w=2 http • CWE-254: 7PK - Security Features CWE-754: Improper Check for Unusual or Exceptional Conditions •