Dr. Stephen Henson

5 exploits Active since Jan 2015
CVE-2014-8275 WRITEUP WRITEUP
OpenSSL < 0.9.8zd 1.0.0 < 1.0.0p 1.0.1 < 1.0.1k - Certificate Blacklist Bypass via Unsigned Certificate Data
OpenSSL before 0.9.8zd, 1.0.0 before 1.0.0p, and 1.0.1 before 1.0.1k does not enforce certain constraints on certificate data, which allows remote attackers to defeat a fingerprint-based certificate-blacklist protection mechanism by including crafted data within a certificate's unsigned portion, related to crypto/asn1/a_verify.c, crypto/dsa/dsa_asn1.c, crypto/ecdsa/ecs_vrf.c, and crypto/x509/x_all.c.
CVE-2014-8275 WRITEUP WRITEUP
OpenSSL < 0.9.8zd 1.0.0 < 1.0.0p 1.0.1 < 1.0.1k - Certificate Blacklist Bypass via Unsigned Certificate Data
OpenSSL before 0.9.8zd, 1.0.0 before 1.0.0p, and 1.0.1 before 1.0.1k does not enforce certain constraints on certificate data, which allows remote attackers to defeat a fingerprint-based certificate-blacklist protection mechanism by including crafted data within a certificate's unsigned portion, related to crypto/asn1/a_verify.c, crypto/dsa/dsa_asn1.c, crypto/ecdsa/ecs_vrf.c, and crypto/x509/x_all.c.
CVE-2015-0204 WRITEUP WRITEUP
OpenSSL < 0.9.8zd, 1.0.0 < 1.0.0p, 1.0.1 < 1.0.1k - RSA-to-EXPORT_RSA Downgrade Attack via Weak Ephemeral RSA Key
The ssl3_get_key_exchange function in s3_clnt.c in OpenSSL before 0.9.8zd, 1.0.0 before 1.0.0p, and 1.0.1 before 1.0.1k allows remote SSL servers to conduct RSA-to-EXPORT_RSA downgrade attacks and facilitate brute-force decryption by offering a weak ephemeral RSA key in a noncompliant role, related to the "FREAK" issue. NOTE: the scope of this CVE is only client code based on OpenSSL, not EXPORT_RSA issues associated with servers or other TLS implementations.
CVE-2015-0205 WRITEUP WRITEUP
OpenSSL 1.0.0-1.0.0o and 1.0.1-1.0.1j - Unauthenticated Access via Missing CertificateVerify in DH Authentication
The ssl3_get_cert_verify function in s3_srvr.c in OpenSSL 1.0.0 before 1.0.0p and 1.0.1 before 1.0.1k accepts client authentication with a Diffie-Hellman (DH) certificate without requiring a CertificateVerify message, which allows remote attackers to obtain access without knowledge of a private key via crafted TLS Handshake Protocol traffic to a server that recognizes a Certification Authority with DH support.
CVE-2015-1792 WRITEUP WRITEUP
OpenSSL < 0.9.8zg, 1.0.0 < 1.0.0s, 1.0.1 < 1.0.1n, 1.0.2 < 1.0.2b - Denial of Service via NULL BIO Data Structure
The do_free_upto function in crypto/cms/cms_smime.c in OpenSSL before 0.9.8zg, 1.0.0 before 1.0.0s, 1.0.1 before 1.0.1n, and 1.0.2 before 1.0.2b allows remote attackers to cause a denial of service (infinite loop) via vectors that trigger a NULL value of a BIO data structure, as demonstrated by an unrecognized X.660 OID for a hash function.