Test ID:	1.3.6.1.4.1.25623.1.0.703364
Category:	Debian Local Security Checks
Title:	Debian Security Advisory DSA 3364-1 (linux - security update)
Summary:	Several vulnerabilities have been discovered in the Linux kernel that;may lead to a privilege escalation or denial of service.;;CVE-2015-0272;It was discovered that NetworkManager would set IPv6 MTUs based on;the values received in IPv6 RAs (Router Advertisements), without;sufficiently validating these values. A remote attacker could;exploit this attack to disable IPv6 connectivity. This has been;mitigated by adding validation in the kernel.;;CVE-2015-2925;Jann Horn discovered that when a subdirectory of a filesystem is;bind-mounted into a container that has its own user and mount;namespaces, a process with CAP_SYS_ADMIN capability in the user;namespace can access files outside of the subdirectory. The;default Debian configuration mitigated this as it does not allow;unprivileged users to create new user namespaces.;;CVE-2015-5156;Jason Wang discovered that when a virtio_net device is connected;to a bridge in the same VM, a series of TCP packets forwarded;through the bridge may cause a heap buffer overflow. A remote;attacker could use this to cause a denial of service (crash) or;possibly for privilege escalation.;;CVE-2015-6252;Michael S. Tsirkin of Red Hat Engineering found that the vhost;driver leaked file descriptors passed to it with the;VHOST_SET_LOG_FD ioctl command. A privileged local user with access;to the /dev/vhost-net file, either directly or via libvirt, could;use this to cause a denial of service (hang or crash).;;CVE-2015-6937;It was found that the Reliable Datagram Sockets (RDS) protocol;implementation did not verify that an underlying transport exists;when creating a connection. Depending on how a local RDS;application initialised its sockets, a remote attacker might be;able to cause a denial of service (crash) by sending a crafted;packet.;;#796036;Xavier Chantry discovered that the patch provided by the aufs;project to correct behaviour of memory-mapped files from an aufs;mount introduced a race condition in the msync() system call.;Ben Hutchings found that it also introduced a similar bug in the;madvise_remove() function. A local attacker could use this to;cause a denial of service or possibly for privilege escalation.
Description:	Summary: Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation or denial of service. CVE-2015-0272 It was discovered that NetworkManager would set IPv6 MTUs based on the values received in IPv6 RAs (Router Advertisements), without sufficiently validating these values. A remote attacker could exploit this attack to disable IPv6 connectivity. This has been mitigated by adding validation in the kernel. CVE-2015-2925 Jann Horn discovered that when a subdirectory of a filesystem is bind-mounted into a container that has its own user and mount namespaces, a process with CAP_SYS_ADMIN capability in the user namespace can access files outside of the subdirectory. The default Debian configuration mitigated this as it does not allow unprivileged users to create new user namespaces. CVE-2015-5156 Jason Wang discovered that when a virtio_net device is connected to a bridge in the same VM, a series of TCP packets forwarded through the bridge may cause a heap buffer overflow. A remote attacker could use this to cause a denial of service (crash) or possibly for privilege escalation. CVE-2015-6252 Michael S. Tsirkin of Red Hat Engineering found that the vhost driver leaked file descriptors passed to it with the VHOST_SET_LOG_FD ioctl command. A privileged local user with access to the /dev/vhost-net file, either directly or via libvirt, could use this to cause a denial of service (hang or crash). CVE-2015-6937 It was found that the Reliable Datagram Sockets (RDS) protocol implementation did not verify that an underlying transport exists when creating a connection. Depending on how a local RDS application initialised its sockets, a remote attacker might be able to cause a denial of service (crash) by sending a crafted packet. #796036 Xavier Chantry discovered that the patch provided by the aufs project to correct behaviour of memory-mapped files from an aufs mount introduced a race condition in the msync() system call. Ben Hutchings found that it also introduced a similar bug in the madvise_remove() function. A local attacker could use this to cause a denial of service or possibly for privilege escalation. Affected Software/OS: linux on Debian Linux Solution: For the oldstable distribution (wheezy), these problems have been fixed in version 3.2.68-1+deb7u4. CVE-2015-2925 and #796036 do not affect the wheezy distribution. For the stable distribution (jessie), these problems have been fixed in version 3.16.7-ckt11-1+deb8u4. We recommend that you upgrade your linux packages. CVSS Score: 6.9 CVSS Vector: AV:L/AC:M/Au:N/C:C/I:C/A:C
Cross-Ref:	Common Vulnerability Exposure (CVE) ID: CVE-2015-0272 BugTraq ID: 76814 http://www.securityfocus.com/bid/76814 SuSE Security Announcement: SUSE-SU-2015:2108 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2015-11/msg00035.html SuSE Security Announcement: SUSE-SU-2015:2194 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00005.html SuSE Security Announcement: SUSE-SU-2015:2292 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00018.html SuSE Security Announcement: SUSE-SU-2015:2339 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00026.html SuSE Security Announcement: SUSE-SU-2015:2350 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00031.html SuSE Security Announcement: SUSE-SU-2016:0354 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00013.html SuSE Security Announcement: SUSE-SU-2016:2074 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00038.html http://www.ubuntu.com/usn/USN-2792-1 Common Vulnerability Exposure (CVE) ID: CVE-2015-2925 BugTraq ID: 73926 http://www.securityfocus.com/bid/73926 Debian Security Information: DSA-3364 (Google Search) http://www.debian.org/security/2015/dsa-3364 Debian Security Information: DSA-3372 (Google Search) http://www.debian.org/security/2015/dsa-3372 http://permalink.gmane.org/gmane.linux.kernel.containers/29173 http://permalink.gmane.org/gmane.linux.kernel.containers/29177 http://www.openwall.com/lists/oss-security/2015/04/04/4 RedHat Security Advisories: RHSA-2015:2636 http://rhn.redhat.com/errata/RHSA-2015-2636.html RedHat Security Advisories: RHSA-2016:0068 http://rhn.redhat.com/errata/RHSA-2016-0068.html SuSE Security Announcement: SUSE-SU-2016:0335 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00007.html SuSE Security Announcement: SUSE-SU-2016:0337 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00009.html SuSE Security Announcement: SUSE-SU-2016:0380 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00017.html SuSE Security Announcement: SUSE-SU-2016:0381 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00018.html SuSE Security Announcement: SUSE-SU-2016:0383 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00019.html SuSE Security Announcement: SUSE-SU-2016:0384 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00020.html SuSE Security Announcement: SUSE-SU-2016:0386 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00021.html SuSE Security Announcement: SUSE-SU-2016:0387 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00022.html SuSE Security Announcement: SUSE-SU-2016:0434 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00034.html http://www.ubuntu.com/usn/USN-2794-1 http://www.ubuntu.com/usn/USN-2795-1 http://www.ubuntu.com/usn/USN-2798-1 http://www.ubuntu.com/usn/USN-2799-1 Common Vulnerability Exposure (CVE) ID: CVE-2015-5156 BugTraq ID: 76230 http://www.securityfocus.com/bid/76230 http://lists.fedoraproject.org/pipermail/package-announce/2015-November/171454.html http://lists.fedoraproject.org/pipermail/package-announce/2015-October/169378.html RedHat Security Advisories: RHSA-2015:1978 http://rhn.redhat.com/errata/RHSA-2015-1978.html RedHat Security Advisories: RHSA-2016:0855 http://rhn.redhat.com/errata/RHSA-2016-0855.html http://www.securitytracker.com/id/1034045 SuSE Security Announcement: SUSE-SU-2015:1727 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2015-10/msg00009.html http://www.ubuntu.com/usn/USN-2773-1 http://www.ubuntu.com/usn/USN-2774-1 http://www.ubuntu.com/usn/USN-2777-1 Common Vulnerability Exposure (CVE) ID: CVE-2015-6252 BugTraq ID: 76400 http://www.securityfocus.com/bid/76400 http://www.openwall.com/lists/oss-security/2015/08/18/3 http://www.securitytracker.com/id/1033666 http://www.ubuntu.com/usn/USN-2748-1 http://www.ubuntu.com/usn/USN-2749-1 http://www.ubuntu.com/usn/USN-2751-1 http://www.ubuntu.com/usn/USN-2752-1 http://www.ubuntu.com/usn/USN-2759-1 http://www.ubuntu.com/usn/USN-2760-1 Common Vulnerability Exposure (CVE) ID: CVE-2015-6937 BugTraq ID: 76767 http://www.securityfocus.com/bid/76767 http://lists.fedoraproject.org/pipermail/package-announce/2015-September/167358.html http://lists.fedoraproject.org/pipermail/package-announce/2015-October/168447.html http://lists.fedoraproject.org/pipermail/package-announce/2015-October/168539.html http://www.openwall.com/lists/oss-security/2015/09/14/3 http://www.securitytracker.com/id/1034453 SuSE Security Announcement: openSUSE-SU-2015:2232 (Google Search) http://lists.opensuse.org/opensuse-updates/2015-12/msg00039.html
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