ID CVE-2010-0419
Summary 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.
References
Vulnerable Configurations
  • cpe:2.3:a:kvm_qumranet:kvm:83:*:*:*:*:*:*:*
    cpe:2.3:a:kvm_qumranet:kvm:83:*:*:*:*:*:*:*
CVSS
Base: 4.4 (as of 19-09-2017 - 01:30)
Impact:
Exploitability:
CWE CWE-264
CAPEC
  • Using Malicious Files
    An attack of this type exploits a system's configuration that allows an attacker to either directly access an executable file, for example through shell access; or in a possible worst case allows an attacker to upload a file and then execute it. Web servers, ftp servers, and message oriented middleware systems which have many integration points are particularly vulnerable, because both the programmers and the administrators must be in synch regarding the interfaces and the correct privileges for each interface.
  • Leverage Executable Code in Non-Executable Files
    An attack of this type exploits a system's trust in configuration and resource files. When the executable loads the resource (such as an image file or configuration file) the attacker has modified the file to either execute malicious code directly or manipulate the target process (e.g. application server) to execute based on the malicious configuration parameters. Since systems are increasingly interrelated mashing up resources from local and remote sources the possibility of this attack occurring is high.
  • Restful Privilege Elevation
    Rest uses standard HTTP (Get, Put, Delete) style permissions methods, but these are not necessarily correlated generally with back end programs. Strict interpretation of HTTP get methods means that these HTTP Get services should not be used to delete information on the server, but there is no access control mechanism to back up this logic. This means that unless the services are properly ACL'd and the application's service implementation are following these guidelines then an HTTP request can easily execute a delete or update on the server side. The attacker identifies a HTTP Get URL such as http://victimsite/updateOrder, which calls out to a program to update orders on a database or other resource. The URL is not idempotent so the request can be submitted multiple times by the attacker, additionally, the attacker may be able to exploit the URL published as a Get method that actually performs updates (instead of merely retrieving data). This may result in malicious or inadvertent altering of data on the server.
  • Target Programs with Elevated Privileges
    This attack targets programs running with elevated privileges. The attacker would try to leverage a bug in the running program and get arbitrary code to execute with elevated privileges. For instance an attacker would look for programs that write to the system directories or registry keys (such as HKLM, which stores a number of critical Windows environment variables). These programs are typically running with elevated privileges and have usually not been designed with security in mind. Such programs are excellent exploit targets because they yield lots of power when they break. The malicious user try to execute its code at the same level as a privileged system call.
  • Manipulating Web Input to File System Calls
    An attacker manipulates inputs to the target software which the target software passes to file system calls in the OS. The goal is to gain access to, and perhaps modify, areas of the file system that the target software did not intend to be accessible.
Access
VectorComplexityAuthentication
LOCAL MEDIUM NONE
Impact
ConfidentialityIntegrityAvailability
PARTIAL PARTIAL PARTIAL
cvss-vector via4 AV:L/AC:M/Au:N/C:P/I:P/A:P
oval via4
accepted 2013-04-29T04:02:09.004-04:00
class vulnerability
contributors
  • name Aharon Chernin
    organization SCAP.com, LLC
  • name Dragos Prisaca
    organization G2, Inc.
definition_extensions
  • comment The operating system installed on the system is Red Hat Enterprise Linux 5
    oval oval:org.mitre.oval:def:11414
  • comment The operating system installed on the system is CentOS Linux 5.x
    oval oval:org.mitre.oval:def:15802
  • comment Oracle Linux 5.x
    oval oval:org.mitre.oval:def:15459
description 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.
family unix
id oval:org.mitre.oval:def:10139
status accepted
submitted 2010-07-09T03:56:16-04:00
title 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.
version 18
redhat via4
advisories
bugzilla
id 563463
title CVE-2010-0419 kvm: emulator privilege escalation segment selector check
oval
AND
  • comment Red Hat Enterprise Linux 5 is installed
    oval oval:com.redhat.rhba:tst:20070331001
  • OR
    • AND
      • comment kmod-kvm is earlier than 0:83-105.el5_4.27
        oval oval:com.redhat.rhsa:tst:20100126006
      • comment kmod-kvm is signed with Red Hat redhatrelease key
        oval oval:com.redhat.rhsa:tst:20091465005
    • AND
      • comment kvm is earlier than 0:83-105.el5_4.27
        oval oval:com.redhat.rhsa:tst:20100126002
      • comment kvm is signed with Red Hat redhatrelease key
        oval oval:com.redhat.rhsa:tst:20091465003
    • AND
      • comment kvm-qemu-img is earlier than 0:83-105.el5_4.27
        oval oval:com.redhat.rhsa:tst:20100126004
      • comment kvm-qemu-img is signed with Red Hat redhatrelease key
        oval oval:com.redhat.rhsa:tst:20091465007
    • AND
      • comment kvm-tools is earlier than 0:83-105.el5_4.27
        oval oval:com.redhat.rhsa:tst:20100126008
      • comment kvm-tools is signed with Red Hat redhatrelease key
        oval oval:com.redhat.rhsa:tst:20091465009
rhsa
id RHSA-2010:0126
released 2010-03-01
severity Important
title RHSA-2010:0126: kvm security and bug fix update (Important)
rpms
  • kmod-kvm-0:83-105.el5_4.27
  • kvm-0:83-105.el5_4.27
  • kvm-qemu-img-0:83-105.el5_4.27
  • kvm-tools-0:83-105.el5_4.27
refmap via4
bid 38467
confirm https://bugzilla.redhat.com/show_bug.cgi?id=563463
sectrack 1023663
xf kernel-selectors-privilege-escalation(56662)
Last major update 19-09-2017 - 01:30
Published 05-03-2010 - 16:30
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