OpenSSL 1.0.2 < 1.0.2a Multiple Vulnerabilities

OpenSSL 1.0.2 prior to 1.0.2a are unpatched for the following vulnerabilities:

• A flaw exists in the ‘DTLSv1_listen()’ function due to the state being preserved in the SSL object from one invocation to the next. A remote attacker can exploit this, via crafted DTLS traffic, to cause a segmentation fault, resulting in a denial of service. (CVE-2015-0207)

• A flaw exists in the ‘rsa_item_verify()’ function due to improper implementation of ASN.1 signature verification. A remote attacker can exploit this, via an ASN.1 signature using the RSA PSS algorithm and invalid parameters, to cause a NULL pointer dereference, resulting in a denial of service. (CVE-2015-0208)

• A use-after-free condition exists in the 'd2i_ECPrivateKey() function due to improper processing of malformed EC private key files during import. A remote attacker can exploit this to dereference or free already freed memory, resulting in a denial of service or other unspecified impact. (CVE-2015-0209)

• A flaw exists in the ‘ssl3_client_hello()’ function due to improper validation of a PRNG seed before proceeding with a handshake, resulting in insufficient entropy and predictable output. This allows a man-in-the-middle attacker to defeat cryptographic protection mechanisms via a brute-force attack, resulting in the disclosure of sensitive information. (CVE-2015-0285)

• An invalid read flaw exists in the ‘ASN1_TYPE_cmp()’ function due to improperly performed boolean-type comparisons. A remote attacker can exploit this, via a crafted X.509 certificate to an endpoint that uses the certificate-verification feature, to cause an invalid read operation, resulting in a denial of service. (CVE-2015-0286)

• A flaw exists in the ‘ASN1_item_ex_d2i()’ function due to a failure to reinitialize ‘CHOICE’ and ‘ADB’ data structures when reusing a structure in ASN.1 parsing. This allows a remote attacker to cause an invalid write operation and memory corruption, resulting in a denial of service. (CVE-2015-0287)

• A NULL pointer dereference flaw exists in the ‘X509_to_X509_REQ()’ function due to improper processing of certificate keys. This allows a remote attacker, via a crafted X.509 certificate, to cause a denial of service. (CVE-2015-0288)

• A NULL pointer dereference flaw exists in the PKCS#7 parsing code due to incorrect handling of missing outer ‘ContentInfo’. This allows a remote attacker, using an application that processes arbitrary PKCS#7 data and providing malformed data with ASN.1 encoding, to cause a denial of service. (CVE-2015-0289)

• A flaw exists with the ‘multiblock’ feature in the ‘ssl3_write_bytes()’ function due to improper handling of certain non-blocking I/O cases. This allows a remote attacker to cause failed connections or a segmentation fault, resulting in a denial of service. (CVE-2015-0290)

• A NULL pointer dereference flaw exists when handling clients attempting to renegotiate using an invalid signature algorithm extension. A remote attacker can exploit this to cause a denial of service. (CVE-2015-0291)

• A flaw exists in servers that both support SSLv2 and enable export cipher suites due to improper implementation of SSLv2. A remote attacker can exploit this, via a crafted CLIENT-MASTER-KEY message, to cause a denial of service. (CVE-2015-0293)

• A flaw exists in the ‘ssl3_get_client_key_exchange()’ function when client authentication and an ephemeral Diffie-Hellman ciphersuite are enabled. This allows a remote attacker, via a ClientKeyExchange message with a length of zero, to cause a denial of service. (CVE-2015-1787)