exploit the possibilities

Secunia Security Advisory 47293

Secunia Security Advisory 47293
Posted Dec 22, 2011
Authored by Secunia | Site secunia.com

Secunia Security Advisory - A vulnerability has been reported in the Linux Kernel, which can be exploited by malicious, local users in a guest virtual machine to cause a DoS (Denial of Service).

tags | advisory, denial of service, kernel, local
systems | linux
MD5 | 46722c0b8f02d6ad15259d17a6e13e1b

Secunia Security Advisory 47293

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TITLE:
Linux Kernel KVM PIT Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA47293

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/47293/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=47293

RELEASE DATE:
2011-12-22

DISCUSS ADVISORY:
http://secunia.com/advisories/47293/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
* Last Update
* Popularity
* Comments
* Criticality Level
* Impact
* Where
* Solution Status
* Operating System / Software
* CVE Reference(s)

http://secunia.com/advisories/47293/

ONLY AVAILABLE IN CUSTOMER AREA:
* Authentication Level
* Report Reliability
* Secunia PoC
* Secunia Analysis
* Systems Affected
* Approve Distribution
* Remediation Status
* Secunia CVSS Score
* CVSS

https://ca.secunia.com/?page=viewadvisory&vuln_id=47293

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
* AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

DESCRIPTION:
A vulnerability has been reported in the Linux Kernel, which can be
exploited by malicious, local users in a guest virtual machine to
cause a DoS (Denial of Service).

The vulnerability is caused due to an error in the
"create_pit_timer()" function (arch/x86/kvm/i8254.c) when configuring
a Programmable Interrupt Timer (PIT) and can be exploited to cause a
NULL pointer dereference resulting in the crash of a host.

SOLUTION:
Restrict access to trusted users only.

PROVIDED AND/OR DISCOVERED BY:
Jan Kiszka

ORIGINAL ADVISORY:
http://permalink.gmane.org/gmane.comp.emulators.kvm.devel/83564

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

----------------------------------------------------------------------

About:
This Advisory was delivered by Secunia as a free service to help
private users keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/advisories/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/advisories/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

----------------------------------------------------------------------

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