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TITLE:
Linux Kernel Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA37590

VERIFY ADVISORY:
http://secunia.com/advisories/37590/

DESCRIPTION:
A security issue and some vulnerabilities have been reported in the
Linux Kernel, which can be exploited by malicious, local users to
manipulate certain data and cause a DoS (Denial of Service), and by
malicious people to potentially compromise a vulnerable system.

1) The security issue is caused due to insecure permissions being set
to driver attributes in sysfs
("/sys/bus/pci/drivers/megaraid_sas/poll_mode_io") and can be
exploited to manipulate driver behaviour.

2) A locking error within the TTY subsystem can be exploited to cause
a NULL pointer dereference.

3) A boundary error within the "hfs_bnode_read()" function in
fs/hfs/bnode.c can be exploited to cause a buffer overflow by e.g.
tricking a user into mounting and accessing a specially crafted HFS
file system.

SOLUTION:
Restrict access to trusted users only. Do not mount untrusted file
systems.

PROVIDED AND/OR DISCOVERED BY:
1) Bryn M. Reeves, reported in a Red Hat bugreport.
2) Kyle Bader
3) Amerigo Wan, Red Hat

ORIGINAL ADVISORY:
1) https://bugzilla.redhat.com/show_bug.cgi?id=526068
2) http://bugzilla.kernel.org/show_bug.cgi?id=14605
3) https://bugzilla.redhat.com/show_bug.cgi?id=540736

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