============================================================================ Ubuntu Security Notice USN-2830-1 December 07, 2015 openssl vulnerabilities ============================================================================ A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 15.10 - Ubuntu 15.04 - Ubuntu 14.04 LTS - Ubuntu 12.04 LTS Summary: Several security issues were fixed in OpenSSL. Software Description: - openssl: Secure Socket Layer (SSL) cryptographic library and tools Details: Guy Leaver discovered that OpenSSL incorrectly handled a ServerKeyExchange for an anonymous DH ciphersuite with the value of p set to 0. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. This issue only applied to Ubuntu 15.10. (CVE-2015-1794) Hanno B=C3=B6ck discovered that the OpenSSL Montgomery squaring procedure algorithm may produce incorrect results when being used on x86_64. A remote attacker could possibly use this issue to break encryption. This issue only applied to Ubuntu 15.10. (CVE-2015-3193) Lo=C3=AFc Jonas Etienne discovered that OpenSSL incorrectly handled ASN.1 signatures with a missing PSS parameter. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. (CVE-2015-3194) Adam Langley discovered that OpenSSL incorrectly handled malformed X509_ATTRIBUTE structures. A remote attacker could possibly use this issue to cause OpenSSL to consume resources, resulting in a denial of service. (CVE-2015-3195) It was discovered that OpenSSL incorrectly handled PSK identity hints. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. This issue only applied to Ubuntu 12.04 LTS, Ubuntu 14.04 LTS and Ubuntu 15.04. (CVE-2015-3196) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 15.10: libssl1.0.0 1.0.2d-0ubuntu1.2 Ubuntu 15.04: libssl1.0.0 1.0.1f-1ubuntu11.5 Ubuntu 14.04 LTS: libssl1.0.0 1.0.1f-1ubuntu2.16 Ubuntu 12.04 LTS: libssl1.0.0 1.0.1-4ubuntu5.32 After a standard system update you need to reboot your computer to make all the necessary changes. References: http://www.ubuntu.com/usn/usn-2830-1 CVE-2015-1794, CVE-2015-3193, CVE-2015-3194, CVE-2015-3195, CVE-2015-3196 Package Information: https://launchpad.net/ubuntu/+source/openssl/1.0.2d-0ubuntu1.2 https://launchpad.net/ubuntu/+source/openssl/1.0.1f-1ubuntu11.5 https://launchpad.net/ubuntu/+source/openssl/1.0.1f-1ubuntu2.16 https://launchpad.net/ubuntu/+source/openssl/1.0.1-4ubuntu5.32