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Debian Security Advisory DSA-3237-1 security@debian.org
http://www.debian.org/security/ Ben Hutchings
April 26, 2015 http://www.debian.org/security/faq
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Package : linux
CVE ID : CVE-2014-8159 CVE-2014-9715 CVE-2015-2041 CVE-2015-2042
CVE-2015-2150 CVE-2015-2830 CVE-2015-2922 CVE-2015-3331
CVE-2015-3332 CVE-2015-3339
Debian Bug : 741667 782515 782561 782698

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

CVE-2014-8159

It was found that the Linux kernel’s InfiniBand/RDMA subsystem did
not properly sanitize input parameters while registering memory
regions from user space via the (u)verbs API. A local user with
access to a /dev/infiniband/uverbsX device could use this flaw to
crash the system or, potentially, escalate their privileges on the
system.

CVE-2014-9715

It was found that the netfilter connection tracking subsystem used
too small a type as an offset within each connection’s data
structure, following a bug fix in Linux 3.2.33 and 3.6. In some
configurations, this would lead to memory corruption and crashes
(even without malicious traffic). This could potentially also
result in violation of the netfilter policy or remote code
execution.

This can be mitigated by disabling connection tracking accounting:
sysctl net.netfilter.nf_conntrack_acct=0

CVE-2015-2041

Sasha Levin discovered that the LLC subsystem exposed some variables
as sysctls with the wrong type. On a 64-bit kernel, this possibly
allows privilege escalation from a process with CAP_NET_ADMIN
capability; it also results in a trivial information leak.

CVE-2015-2042

Sasha Levin discovered that the RDS subsystem exposed some variables
as sysctls with the wrong type. On a 64-bit kernel, this results in
a trivial information leak.

CVE-2015-2150

Jan Beulich discovered that Xen guests are currently permitted to
modify all of the (writable) bits in the PCI command register of
devices passed through to them. This in particular allows them to
disable memory and I/O decoding on the device unless the device is
an SR-IOV virtual function, which can result in denial of service
to the host.

CVE-2015-2830

Andrew Lutomirski discovered that when a 64-bit task on an amd64
kernel makes a fork(2) or clone(2) system call using int $0x80, the
32-bit compatibility flag is set (correctly) but is not cleared on
return. As a result, both seccomp and audit will misinterpret the
following system call by the task(s), possibly leading to a
violation of security policy.

CVE-2015-2922

Modio AB discovered that the IPv6 subsystem would process a router
advertisement that specifies no route but only a hop limit, which
would then be applied to the interface that received it. This can
result in loss of IPv6 connectivity beyond the local network.

This may be mitigated by disabling processing of IPv6 router
advertisements if they are not needed:
sysctl net.ipv6.conf.default.accept_ra=0
sysctl net.ipv6.conf.<interface>.accept_ra=0

CVE-2015-3331

Stephan Mueller discovered that the optimised implementation of
RFC4106 GCM for x86 processors that support AESNI miscalculated
buffer addresses in some cases. If an IPsec tunnel is configured to
use this mode (also known as AES-GCM-ESP) this can lead to memory
corruption and crashes (even without malicious traffic). This could
potentially also result in remote code execution.

CVE-2015-3332

Ben Hutchings discovered that the TCP Fast Open feature regressed
in Linux 3.16.7-ckt9, resulting in a kernel BUG when it is used.
This can be used as a local denial of service.

CVE-2015-3339

It was found that the execve(2) system call can race with inode
attribute changes made by chown(2). Although chown(2) clears the
setuid/setgid bits of a file if it changes the respective owner ID,
this race condition could result in execve(2) setting effective
uid/gid to the new owner ID, a privilege escalation.

For the oldstable distribution (wheezy), these problems have been fixed
in version 3.2.68-1+deb7u1. The linux package in wheezy is not affected
by CVE-2015-3332.

For the stable distribution (jessie), these problems have been fixed in
version 3.16.7-ckt9-3~deb8u1 or earlier versions. Additionally, this
version fixes a regression in the xen-netfront driver (#782698).

For the unstable distribution (sid), these problems have been fixed in
version 3.16.7-ckt9-3 or earlier versions. Additionally, this version
fixes a regression in the xen-netfront driver (#782698).

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@lists.debian.org
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