70380 : Linux Kernel Xen x do_block_io_op Function Production Request Index DoS
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Timeline

Disclosure Date
2010-11-23

Description

Linux Kernel Xen contains a flaw that may allow a local denial of service. The issue is triggered when the 'do_block_io_op function' in 'drivers/xen/blkback/blkback.c' and 'drivers/xen/blktap/blktap.c' allow a guest OS user to cause an infinite loop or CPU consumption denial of service via a large production request index to the blkback or blktap-back-end drivers.

Classification

Location: Local Access Required
Attack Type: Denial of Service
Impact: Loss of Availability
Solution: Patch / RCS
Exploit: Exploit Public
Disclosure: Vendor Verified

Solution

Upgrade Xen to version 3.4.0 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.

Products

Citrix Systems, Inc.

Xen

3.3.0

References

CVE ID: 2010-4247 (see also: NVD)
Secunia Advisory ID: 35093 42789 43762 45259 46397
Bugtraq ID: 45029
VUPEN Advisory: ADV-2011-0024
Other Advisory URL: http://wiki.openvz.org/Download/kernel/rhel5/028stab085.2
http://www.openwall.com/lists/oss-security/2010/11/23/1
http://www.openwall.com/lists/oss-security/2010/11/24/8
http://xenbits.xensource.com/linux-2.6.18-xen.hg?rev/7070d34f251c
http://xenbits.xensource.com/linux-2.6.18-xen.hg?rev/77f831cbb91d
Vendor Specific News/Changelog Entry: http://www.vmware.com/security/advisories/VMSA-2011-0012.html
https://bugzilla.redhat.com/show_bug.cgi?id=656206
https://lists.ubuntu.com/archives/ubuntu-security-announce/2011-July/001374.html
RedHat RHSA: RHSA-2011:0004

Credit

Not Available

CVSSv2 Score

CVSSv2 Base Score = 5.5
Source: nvd.nist.gov | Generated: 2011-01-11 | Disagree?

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