Scientific Linux Security Update : kernel on SL7.x x86_64

This script is Copyright (C) 2015 Tenable Network Security, Inc.


Synopsis :

The remote Scientific Linux host is missing one or more security
updates.

Description :

- A buffer overflow flaw was found in the way the Linux
kernel's Intel AES-NI instructions optimized version of
the RFC4106 GCM mode decryption functionality handled
fragmented packets. A remote attacker could use this
flaw to crash, or potentially escalate their privileges
on, a system over a connection with an active AEC-GCM
mode IPSec security association. (CVE-2015-3331,
Important)

This update also fixes the following bugs :

- Previously, the kernel audit subsystem did not correctly
track file path names which could lead to empty, or
'(null)' path names in the PATH audit records. This
update fixes the bug by correctly tracking file path
names and displaying the names in the audit PATH
records.

- Due to a change in the internal representation of field
types, AUDIT_LOGINUID set to -1 (4294967295) by the
audit API was asymmetrically converted to an
AUDIT_LOGINUID_SET field with a value of 0, unrecognized
by an older audit API. To fix this bug, the kernel takes
note about the way the rule has been formulated and
reports the rule in the originally given form. As a
result, older versions of audit provide a report as
expected, in the AUDIT_LOGINUID field type form, whereas
the newer versions can migrate to the new
AUDIT_LOGINUID_SET filed type.

- The GFS2 file system 'Splice Read' operation, which is
used for the sendfile() function, was not properly
allocating a required multi-block reservation structure
in memory. Consequently, when the GFS2 block allocator
was called to assign blocks of data, it attempted to
dereference the structure, which resulted in a kernel
panic. With this update, 'Splice read' operation
properly allocates the necessary reservation structure
in memory prior to calling the block allocator, and
sendfile() thus works properly for GFS2.

- Moving an Open vSwitch (OVS) internal vport to a
different net name space and subsequently deleting that
name space led to a kernel panic. This bug has been
fixed by removing the OVS internal vport at net name
space deletion.

- Previously, the kernel audit subsystem was not correctly
handling file and directory moves, leading to audit
records that did not match the audit file watches. This
fix correctly handles moves such that the audit file
watches work correctly.

- Due to a regression, the crypto adapter could not be set
online. A patch has been provided that fixes the device
registration process so that the device can be used also
before the registration process is completed, thus
fixing this bug.

- Due to incorrect calculation for entropy during the
entropy addition, the amount of entropy in the
/dev/random file could be overestimated. The formula for
the entropy addition has been changed, thus fixing this
bug.

- Previously, the ansi_cprng and drbg utilities did not
obey the call convention and returned the positive value
on success instead of the correct value of zero.
Consequently, Internet Protocol Security (IPsec)
terminated unexpectedly when ansi_cprng or drbg were
used. With this update, ansi_cprng and drbg have been
changed to return zero on success, and IPsec now
functions correctly.

- Due to a failure to clear the timestamp flag when
reusing a tx descriptor in the mlx4_en driver, programs
that did not request a hardware timestamp packet on
their sent data received it anyway, resulting in
unexpected behavior in certain applications. With this
update, when reusing the tx descriptor in the mlx4_en
driver in the aforementioned situation, the hardware
timestamp flag is cleared, and applications now behave
as expected.

The system must be rebooted for this update to take effect.

See also :

http://www.nessus.org/u?ef671a21

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 9.3
(CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C)

Family: Scientific Linux Local Security Checks

Nessus Plugin ID: 83451 ()

Bugtraq ID:

CVE ID: CVE-2015-3331

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