-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 - ------------------------------------------------------------------------- Debian Security Advisory DSA-3791-1 security@xxxxxxxxxx https://www.debian.org/security/ Salvatore Bonaccorso February 22, 2017 https://www.debian.org/security/faq - ------------------------------------------------------------------------- Package : linux CVE ID : CVE-2016-6786 CVE-2016-6787 CVE-2016-8405 CVE-2016-9191 CVE-2017-2583 CVE-2017-2584 CVE-2017-2596 CVE-2017-2618 CVE-2017-5549 CVE-2017-5551 CVE-2017-5897 CVE-2017-5970 CVE-2017-6001 CVE-2017-6074 Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or have other impacts. CVE-2016-6786 / CVE-2016-6787 It was discovered that the performance events subsystem does not properly manage locks during certain migrations, allowing a local attacker to escalate privileges. This can be mitigated by disabling unprivileged use of performance events: sysctl kernel.perf_event_paranoid=3 CVE-2016-8405 Peter Pi of Trend Micro discovered that the frame buffer video subsystem does not properly check bounds while copying color maps to userspace, causing a heap buffer out-of-bounds read, leading to information disclosure. CVE-2016-9191 CAI Qian discovered that reference counting is not properly handled within proc_sys_readdir in the sysctl implementation, allowing a local denial of service (system hang) or possibly privilege escalation. CVE-2017-2583 Xiaohan Zhang reported that KVM for amd64 does not correctly emulate loading of a null stack selector. This can be used by a user in a guest VM for denial of service (on an Intel CPU) or to escalate privileges within the VM (on an AMD CPU). CVE-2017-2584 Dmitry Vyukov reported that KVM for x86 does not correctly emulate memory access by the SGDT and SIDT instructions, which can result in a use-after-free and information leak. CVE-2017-2596 Dmitry Vyukov reported that KVM leaks page references when emulating a VMON for a nested hypervisor. This can be used by a privileged user in a guest VM for denial of service or possibly to gain privileges in the host. CVE-2017-2618 It was discovered that an off-by-one in the handling of SELinux attributes in /proc/pid/attr could result in local denial of service. CVE-2017-5549 It was discovered that the KLSI KL5KUSB105 serial USB device driver could log the contents of uninitialised kernel memory, resulting in an information leak. CVE-2017-5551 Jan Kara found that changing the POSIX ACL of a file on tmpfs never cleared its set-group-ID flag, which should be done if the user changing it is not a member of the group-owner. In some cases, this would allow the user-owner of an executable to gain the privileges of the group-owner. CVE-2017-5897 Andrey Konovalov discovered an out-of-bounds read flaw in the ip6gre_err function in the IPv6 networking code. CVE-2017-5970 Andrey Konovalov discovered a denial-of-service flaw in the IPv4 networking code. This can be triggered by a local or remote attacker if a local UDP or raw socket has the IP_RETOPTS option enabled. CVE-2017-6001 Di Shen discovered a race condition between concurrent calls to the performance events subsystem, allowing a local attacker to escalate privileges. This flaw exists because of an incomplete fix of CVE-2016-6786. This can be mitigated by disabling unprivileged use of performance events: sysctl kernel.perf_event_paranoid=3 CVE-2017-6074 Andrey Konovalov discovered a use-after-free vulnerability in the DCCP networking code, which could result in denial of service or local privilege escalation. On systems that do not already have the dccp module loaded, this can be mitigated by disabling it: echo >> /etc/modprobe.d/disable-dccp.conf install dccp false For the stable distribution (jessie), these problems have been fixed in version 3.16.39-1+deb8u1. We recommend that you upgrade your linux packages. Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/ Mailing list: debian-security-announce@xxxxxxxxxxxxxxxx -----BEGIN PGP SIGNATURE----- iQKTBAEBCgB9FiEERkRAmAjBceBVMd3uBUy48xNDz0QFAlit3fFfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldDQ2 NDQ0MDk4MDhDMTcxRTA1NTMxRERFRTA1NENCOEYzMTM0M0NGNDQACgkQBUy48xND z0RyhA/+JW0SzLC04cq+WNLAqpfaxpThY34zIyQJlzHYYhYCOIkuUftbDKe47oNz IKSQcmoIWv0S50yB5GwWB4iE6kBjOYPEDd91AVXjNHTZwyxIwzDxmKKBHZtAzEp/ xQGTvcK0Y6fO9DBsitLLGykCaodCeMkse9pZSpWVDk9dLqyu+UIrdS49Fsz15fyf AmBA8L7456pGFjh0zQ96mgG1sLgPDiXDTO49h8ORBZPuZxTPR/k9ff8f2piZaPx8 OZBUsOEp/cQyxoFG8yPQusnTzZvv4Pi4Ugoh+3QLhPlSJFP3et09N0kvNZ3yQZC/ oBDjCm2vH+JrujUpVDNv+l8wgoCbtcsS6Y5HoCgBicK914fKqgyU5VmB98q5914J MpWYvaLC3HpoQ5JIkUGNkblxX9ETtGzRO5r361HaSJkH20LClEW7Fe/ZcdVdQrtN QB1FiGVec72Ox+/Ih2LwtZPZmxnAYQ7zQOgFFmadV5j9knUqaiZ519wSdusf3T83 uKvF/jRRkLszsaFwOT61O9/P4Ni5CfeZmytQ2jeLbCUOd5TxLeGQiUNAw7Ii6/fZ ayFIPVOm9fFwMQ1cuwrS0qBWZEwBu4BjgxNiXiwwxHskLRES5bZnA8Tqv0PJAwNd RqRR023yxKYLavEesBOy3fDcQkKHBWYTqe96Cb1qOJ7ynzcJ6DA= =Hp/U -----END PGP SIGNATURE-----
