Ubuntu security

USN-3293-1: Linux kernel vulnerabilities Ubuntu Security Notice USN-3293-1 16th May, 2017 linux, linux-raspi2 vulnerabilities A security issue affects these releases of Ubuntu and its derivatives: Ubuntu 17.04 Summary Several security issues were fixed in the kernel. Software description linux – Linux kernel linux-raspi2 – Linux kernel for Raspberry Pi 2 Details Dmitry Vyukov discovered that KVM implementation in the Linux kernelimproperly emulated the VMXON instruction. A local attacker in a guest OScould use this to cause a denial of service (memory consumption) in thehost OS. (CVE-2017-2596) Dmitry Vyukov discovered that the generic SCSI (sg) subsystem in the Linuxkernel contained a stack-based buffer overflow. A local attacker withaccess to an sg device could use this to cause a denial of service (systemcrash) or possibly execute arbitrary code. (CVE-2017-7187) It was discovered that a NULL pointer dereference existed in the DirectRendering Manager [ more… ]

USN-3292-2: Linux kernel (HWE) vulnerability Ubuntu Security Notice USN-3292-2 16th May, 2017 linux-hwe vulnerability A security issue affects these releases of Ubuntu and its derivatives: Ubuntu 16.04 LTS Summary The system could be made to crash or run programs as an administrator. Software description linux-hwe – Linux hardware enablement (HWE) kernel Details USN-3292-1 fixed a vulnerability in the Linux kernel for Ubuntu 16.10.This update provides the corresponding updates for the Linux HardwareEnablement (HWE) kernel from Ubuntu 16.10 for Ubuntu 16.04 LTS. Jason Donenfeld discovered a heap overflow in the MACsec module in theLinux kernel. An attacker could use this to cause a denial of service(system crash) or possibly execute arbitrary code. Update instructions The problem can be corrected by updating your system to the following package version: Ubuntu 16.04 LTS: linux-image-4.8.0-52-lowlatency 4.8.0-52.55~16.04.1 linux-image-generic-hwe-16.04 4.8.0.52.23 linux-image-4.8.0-52-generic-lpae 4.8.0-52.55~16.04.1 linux-image-lowlatency-hwe-16.04 4.8.0.52.23 linux-image-4.8.0-52-generic 4.8.0-52.55~16.04.1 [ more… ]

USN-3285-1: LightDM vulnerability Ubuntu Security Notice USN-3285-1 11th May, 2017 lightdm vulnerability A security issue affects these releases of Ubuntu and its derivatives: Ubuntu 17.04 Ubuntu 16.10 Summary LightDM could allow unintended access to files. Software description lightdm – Display Manager Details Tyler Hicks discovered that LightDM did not confine the user session for guestusers. An attacker with physical access could use this issue to access filesand other resources that they should not be able to access. In the defaultinstallation, this includes files in the home directories of other users on thesystem. This update fixes the issue by disabling the guest session. It may bere-enabled in a future update. Please see the bug referenced below forinstructions on how to manually re-enable the guest session. Update instructions The problem can be corrected by updating your system to the following package version: [ more… ]

USN-3260-2: Firefox regression Ubuntu Security Notice USN-3260-2 11th May, 2017 firefox regression A security issue affects these releases of Ubuntu and its derivatives: Ubuntu 17.04 Ubuntu 16.10 Ubuntu 16.04 LTS Ubuntu 14.04 LTS Summary USN-3260-1 caused a regression in Firefox. Software description firefox – Mozilla Open Source web browser Details USN-3260-1 fixed vulnerabilities in Firefox. The update caused thedate picker panel and form validation errors to close immediately onopening. This update fixes the problem. We apologize for the inconvenience. Original advisory details: Multiple security issues were discovered in Firefox. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit these to read uninitialized memory, obtain sensitive information, spoof the addressbar contents or other UI elements, escape the sandbox to read local files, conduct cross-site scripting (XSS) attacks, cause a denial of service via [ more… ]

USN-3275-1: OpenJDK 8 vulnerabilities Ubuntu Security Notice USN-3275-1 11th May, 2017 openjdk-8 vulnerabilities A security issue affects these releases of Ubuntu and its derivatives: Ubuntu 17.04 Ubuntu 16.10 Ubuntu 16.04 LTS Summary Several security issues were fixed in OpenJDK 8. Software description openjdk-8 – Open Source Java implementation Details It was discovered that OpenJDK improperly re-used cached NTLMconnections in some situations. A remote attacker could possiblyuse this to cause a Java application to perform actions with thecredentials of a different user. (CVE-2017-3509) It was discovered that an untrusted library search path flaw existedin the Java Cryptography Extension (JCE) component of OpenJDK. Alocal attacker could possibly use this to gain the privileges of aJava application. (CVE-2017-3511) It was discovered that the Java API for XML Processing (JAXP) componentin OpenJDK did not properly enforce size limits when parsing XMLdocuments. An attacker could [ more… ]