Debian DSA-3364-1 : linux - security update

Medium Nessus Plugin ID 86050

Synopsis

The remote Debian host is missing a security-related update.

Description

Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation or denial of service.

- CVE-2015-8215 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.

- CVE-2015-7312 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.

Solution

Upgrade the linux packages.

For the oldstable distribution (wheezy), these problems have been fixed in version 3.2.68-1+deb7u4. CVE-2015-2925 and CVE-2015-7312 do not affect the wheezy distribution.

For the stable distribution (jessie), these problems have been fixed in version 3.16.7-ckt11-1+deb8u4.

See Also

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=796036

https://security-tracker.debian.org/tracker/CVE-2015-8215

https://security-tracker.debian.org/tracker/CVE-2015-2925

https://security-tracker.debian.org/tracker/CVE-2015-5156

https://security-tracker.debian.org/tracker/CVE-2015-6252

https://security-tracker.debian.org/tracker/CVE-2015-6937

https://security-tracker.debian.org/tracker/CVE-2015-7312

https://security-tracker.debian.org/tracker/CVE-2015-2925

https://security-tracker.debian.org/tracker/CVE-2015-7312

https://packages.debian.org/source/jessie/linux

https://www.debian.org/security/2015/dsa-3364

Plugin Details

Severity: Medium

ID: 86050

File Name: debian_DSA-3364.nasl

Version: 2.9

Type: local

Agent: unix

Published: 2015/09/22

Updated: 2019/07/15

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 6.9

Temporal Score: 5.1

Vector: CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:linux, cpe:/o:debian:debian_linux:7.0, cpe:/o:debian:debian_linux:8.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2015/09/21

Vulnerability Publication Date: 2015/10/19

Reference Information

CVE: CVE-2015-2925, CVE-2015-5156, CVE-2015-6252, CVE-2015-6937, CVE-2015-7312, CVE-2015-8215

DSA: 3364