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OVAL Definitions
>
OVAL Definition Details
Id
oval:ru.altx-soft.nix:def:1682
[Eng]
Version
6
Class
patch
ALTXid
40200
Language
Russian
Severity
High
Title
Обновление RHSA-2010:0126: устранение уязвимостей и ошибок в kvm
Description
A flaw was found in the way the x86 emulator loaded segment selectors (used
for memory segmentation and protection) into segment registers. In some
guest system configurations, an unprivileged guest user could leverage this
flaw to crash the guest or possibly escalate their privileges within the
guest. (CVE-2010-0419)
The x86 emulator implementation was missing a check for the Current
Privilege Level (CPL) while accessing debug registers. An unprivileged
user in a guest could leverage this flaw to crash the guest.
(CVE-2009-3722)
Family
unix
Platform
CentOS Linux 5
Red Hat Enterprise Linux 5
Product
kvm
Reference
VENDOR: RHSA-2010:0126-01
VENDOR: RHSA-2010:0126-01
Id:
RHSA-2010:0126-01
Reference:
https://rhn.redhat.com/errata/RHSA-2010-0126.html
CVE: CVE-2009-3722
CVE: CVE-2009-3722
Id:
CVE-2009-3722
Reference:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3722
Comment
: The handle_dr function in arch/x86/kvm/vmx.c in the KVM subsystem in the Linux kernel before 2.6.31.1 does not properly verify the Current Privilege Level (CPL) before accessing a debug register, which allows guest OS users to cause a denial of service (trap) on the host OS via a crafted application.
CVSSv2 Score:
7.1
Access vector:
NETWORK
Access complexity:
MEDIUM
Authentication:
NONE
Confidentiality impact:
NONE
Integrity impact:
NONE
Availability impact:
COMPLETE
CVSSv2 Vector:
AV:N/AC:M/Au:N/C:N/I:N/A:C
CWE:
264 (Permissions, Privileges, and Access Controls)
References:
[oss-security] 20091029 CVE request: kvm: check cpl before emulating debug register access (MLIST)
http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.32-rc1 (CONFIRM)
[oss-security] 20091029 Re: CVE request: kvm: check cpl before emulating debug register access (MLIST)
https://bugzilla.redhat.com/show_bug.cgi?id=531660 (CONFIRM)
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.31.1 (CONFIRM)
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.30.9 (CONFIRM)
37221 (BID)
USN-864-1 (UBUNTU)
RHSA-2010:0126 (REDHAT)
MDVSA-2010:198 (MANDRIVA)
oval:org.mitre.oval:def:9892 (OVAL)
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=0a79b009525b160081d75cef5dbf45817956acf2 (MISC)
CVE: CVE-2010-0419
CVE: CVE-2010-0419
Id:
CVE-2010-0419
Reference:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-0419
Comment
: The x86 emulator in KVM 83, when a guest is configured for Symmetric Multiprocessing (SMP), does not properly restrict writing of segment selectors to segment registers, which might allow guest OS users to cause a denial of service (guest OS crash) or gain privileges on the guest OS by leveraging access to a (1) IO port or (2) MMIO region, and replacing an instruction in between emulator entry and instruction fetch.
CVSSv2 Score:
4.4
Access vector:
LOCAL
Access complexity:
MEDIUM
Authentication:
NONE
Confidentiality impact:
PARTIAL
Integrity impact:
PARTIAL
Availability impact:
PARTIAL
CVSSv2 Vector:
AV:L/AC:M/Au:N/C:P/I:P/A:P
CWE:
264 (Permissions, Privileges, and Access Controls)
References:
RHSA-2010:0126 (REDHAT)
38467 (BID)
https://bugzilla.redhat.com/show_bug.cgi?id=563463 (CONFIRM)
1023663 (SECTRACK)
kernel-selectors-privilege-escalation(56662) (XF)
oval:org.mitre.oval:def:10139 (OVAL)
CESA-2010:0126: CESA-2010:0126
CESA-2010:0126: CESA-2010:0126
Id:
CESA-2010:0126
Reference:
http://lists.centos.org/pipermail/centos-announce/2010-March/016539.html
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