Security Fix(es) :

  - A memory leak flaw was found in the way OpenSSL handled     TLS status request extension data during session     renegotiation. A remote attacker could cause a TLS     server using OpenSSL to consume an excessive amount of     memory and, possibly, exit unexpectedly after exhausting     all available memory, if it enabled OCSP stapling     support. (CVE-2016-6304)

  - It was discovered that OpenSSL did not always use     constant time operations when computing Digital     Signature Algorithm (DSA) signatures. A local attacker     could possibly use this flaw to obtain a private DSA key     belonging to another user or service running on the same     system. (CVE-2016-2178)

  - It was discovered that the Datagram TLS (DTLS)     implementation could fail to release memory in certain     cases. A malicious DTLS client could cause a DTLS server     using OpenSSL to consume an excessive amount of memory     and, possibly, exit unexpectedly after exhausting all     available memory. (CVE-2016-2179)

  - A flaw was found in the Datagram TLS (DTLS) replay     protection implementation in OpenSSL. A remote attacker     could possibly use this flaw to make a DTLS server using     OpenSSL to reject further packets sent from a DTLS     client over an established DTLS connection.
    (CVE-2016-2181)

  - An out of bounds write flaw was discovered in the     OpenSSL BN_bn2dec() function. An attacker able to make     an application using OpenSSL to process a large BIGNUM     could cause the application to crash or, possibly,     execute arbitrary code. (CVE-2016-2182)

  - A flaw was found in the DES/3DES cipher was used as part     of the TLS/SSL protocol. A man-in-the-middle attacker     could use this flaw to recover some plaintext data by     capturing large amounts of encrypted traffic between     TLS/SSL server and client if the communication used a     DES/3DES based ciphersuite. (CVE-2016-2183)

This update mitigates the CVE-2016-2183 issue by lowering priority of DES cipher suites so they are not preferred over cipher suites using AES. For compatibility reasons, DES cipher suites remain enabled by default and included in the set of cipher suites identified by the HIGH cipher string. Future updates may move them to MEDIUM or not enable them by default.

  - An integer underflow flaw leading to a buffer over-read     was found in the way OpenSSL parsed TLS session tickets.
    A remote attacker could use this flaw to crash a TLS     server using OpenSSL if it used SHA-512 as HMAC for     session tickets. (CVE-2016-6302)

  - Multiple integer overflow flaws were found in the way     OpenSSL performed pointer arithmetic. A remote attacker     could possibly use these flaws to cause a TLS/SSL server     or client using OpenSSL to crash. (CVE-2016-2177)

  - An out of bounds read flaw was found in the way OpenSSL     formatted Public Key Infrastructure Time-Stamp Protocol     data for printing. An attacker could possibly cause an     application using OpenSSL to crash if it printed time     stamp data from the attacker. (CVE-2016-2180)

  - Multiple out of bounds read flaws were found in the way     OpenSSL handled certain TLS/SSL protocol handshake     messages. A remote attacker could possibly use these     flaws to crash a TLS/SSL server or client using OpenSSL.
    (CVE-2016-6306)

Detections

Analytics

Scientific Linux Security Update : openssl on SL6.x, SL7.x i386/x86_64 (20160927)

critical Nessus Plugin ID 93795

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