RHEL 6 : kernel (RHSA-2017:2732) (BlueBorne)

This script is Copyright (C) 2017 Tenable Network Security, Inc.


Synopsis :

The remote Red Hat host is missing one or more security updates.

Description :

An update for kernel is now available for Red Hat Enterprise Linux 6.2
Advanced Update Support.

Red Hat Product Security has rated this update as having a security
impact of Important. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available for each
vulnerability from the CVE link(s) in the References section.

The kernel packages contain the Linux kernel, the core of any Linux
operating system.

Security Fix(es) :

* The NFSv2 and NFSv3 server implementations in the Linux kernel
through 4.10.13 lacked certain checks for the end of a buffer. A
remote attacker could trigger a pointer-arithmetic error or possibly
cause other unspecified impacts using crafted requests related to
fs/nfsd/nfs3xdr.c and fs/nfsd/nfsxdr.c. (CVE-2017-7895, Important)

* A stack-based buffer overflow flaw was found in the way the
Bluetooth subsystem of the Linux kernel processed pending L2CAP
configuration responses from a client. On systems with the stack
protection feature enabled in the kernel (CONFIG_CC_STACKPROTECTOR=y,
which is enabled on all architectures other than s390x and ppc64[le]),
an unauthenticated attacker able to initiate a connection to a system
via Bluetooth could use this flaw to crash the system. Due to the
nature of the stack protection feature, code execution cannot be fully
ruled out, although we believe it is unlikely. On systems without the
stack protection feature (ppc64[le]; the Bluetooth modules are not
built on s390x), an unauthenticated attacker able to initiate a
connection to a system via Bluetooth could use this flaw to remotely
execute arbitrary code on the system with ring 0 (kernel) privileges.
(CVE-2017-1000251, Important)

Red Hat would like to thank Ari Kauppi for reporting CVE-2017-7895 and
Armis Labs for reporting CVE-2017-1000251.

Bug Fix(es) :

* Previously, while the MAP_GROWSDOWN flag was set, writing to the
memory which was mapped with the mmap system call failed with the
SIGBUS signal. This update fixes memory management in the Linux kernel
by backporting an upstream patch that enlarges the stack guard page
gap. As a result, mmap now works as expected under the described
circumstances. (BZ#1474720)

See also :

https://access.redhat.com/security/vulnerabilities/CVE-2017-1000251
http://rhn.redhat.com/errata/RHSA-2017-2732.html
https://www.redhat.com/security/data/cve/CVE-2017-1000251.html
https://www.redhat.com/security/data/cve/CVE-2017-7895.html

Solution :

Update the affected packages.

Risk factor :

Critical / CVSS Base Score : 10.0
(CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 7.4
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Red Hat Local Security Checks

Nessus Plugin ID: 103243 ()

Bugtraq ID:

CVE ID: CVE-2017-1000251
CVE-2017-7895

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