Scientific Linux Security Update : kernel on SL5.x i386/x86_64 (Dirty COW)

This script is Copyright (C) 2016-2017 Tenable Network Security, Inc.

Synopsis :

The remote Scientific Linux host is missing one or more security

Description :

Security Fix(es) :

- A race condition was found in the way the Linux kernel's
memory subsystem handled the copy-on-write (COW)
breakage of private read-only memory mappings. An
unprivileged, local user could use this flaw to gain
write access to otherwise read-only memory mappings and
thus increase their privileges on the system.
(CVE-2016-5195, Important)

- It was found that stacking a file system over procfs in
the Linux kernel could lead to a kernel stack overflow
due to deep nesting, as demonstrated by mounting
ecryptfs over procfs and creating a recursion by mapping
/proc/environ. An unprivileged, local user could
potentially use this flaw to escalate their privileges
on the system. (CVE-2016-1583, Important)

Bug Fix(es) :

- In some cases, a kernel crash or file system corruption
occurred when running journal mode 'ordered'. The kernel
crash was caused by a NULL pointer dereference due to a
race condition between two journal functions. The file
system corruption occurred due to a race condition
between the do_get_write_access() function and buffer
writeout. This update fixes both race conditions. As a
result, neither the kernel crash, nor the file system
corruption now occur.

- Prior to this update, some Global File System 2 (GFS2)
files had incorrect time stamp values due to two
problems with handling time stamps of such files. The
first problem concerned the atime time stamp, which
ended up with an arbitrary value ahead of the actual
value, when a GFS2 file was accessed. The second problem
was related to the mtime and ctime time stamp updates,
which got lost when a GFS2 file was written to from one
node and read from or written to from another node. With
this update, a set of patches has been applied that fix
these problems. As a result, the time stamps of GFS2
files are now handled correctly.

See also :

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.2
Public Exploit Available : true

Family: Scientific Linux Local Security Checks

Nessus Plugin ID: 94432 ()

Bugtraq ID:

CVE ID: CVE-2016-1583

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