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Red Hat Enterprise Linux 5: RHSA-2013:0807-01 Low: Hypervkvpd DoS

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Calendar Grey May 9, 2013
Scroller Redhat
Red Hat Security Advisory Synopsis: Low: hypervkvpd security and bug fix update Advisory ID: RHSA-20
An updated hypervkvpd package that fixes one security issue and one bug is now available for Red Hat Enterprise Linux 5

Solution

Before applying this update, make sure all previously-released errata relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at https://access.redhat.com/knowledge/articles/11258

Summary

The hypervkvpd package contains hypervkvpd, the guest Microsoft Hyper-V Key-Value Pair (KVP) daemon. The daemon passes basic information to the host through VMBus, such as the guest IP address, fully qualified domain name, operating system name, and operating system release number.
A denial of service flaw was found in the way hypervkvpd processed certain Netlink messages. A local, unprivileged user in a guest (running on Microsoft Hyper-V) could send a Netlink message that, when processed, would cause the guest's hypervkvpd daemon to exit. (CVE-2012-5532)
The CVE-2012-5532 issue was discovered by Florian Weimer of the Red Hat Product Security Team.
This update also fixes the following bug:
* The hypervkvpd daemon did not close the file descriptors for pool files when they were updated. This could eventually lead to hypervkvpd crashing with a "KVP: Failed to open file, pool: 1" error after consuming all available file descriptors. With this update, the file descriptors are closed, correcting this issue. (BZ#953502)
Users of hypervkvpd are advised to upgrade to this updated package, which contains backported patches to correct these issues. After installing the update, it is recommended to reboot all guest machines.

Topics%20covered

Topics Covered

security advisory denial of service Red Hat Enterprise Linux low impact hypervkvpd

References

https://access.redhat.com/security/cve/CVE-2012-5532 https://access.redhat.com/security/updates/classification/#low

Package List

Red Hat Enterprise Linux Desktop (v. 5 client):
Source:
i386: hypervkvpd-0-0.7.el5_9.3.i686.rpm hypervkvpd-debuginfo-0-0.7.el5_9.3.i686.rpm
x86_64: hypervkvpd-0-0.7.el5_9.3.x86_64.rpm hypervkvpd-debuginfo-0-0.7.el5_9.3.x86_64.rpm
RHEL Desktop Multi OS (v. 5 client):
Source:
i386: hypervkvpd-0-0.7.el5_9.3.i686.rpm hypervkvpd-debuginfo-0-0.7.el5_9.3.i686.rpm
x86_64: hypervkvpd-0-0.7.el5_9.3.x86_64.rpm hypervkvpd-debuginfo-0-0.7.el5_9.3.x86_64.rpm
Red Hat Enterprise Linux (v. 5 server):
Source:
i386: hypervkvpd-0-0.7.el5_9.3.i686.rpm hypervkvpd-debuginfo-0-0.7.el5_9.3.i686.rpm
x86_64: hypervkvpd-0-0.7.el5_9.3.x86_64.rpm hypervkvpd-debuginfo-0-0.7.el5_9.3.x86_64.rpm
RHEL Virtualization (v. 5 server):
Source:
i386: hypervkvpd-0-0.7.el5_9.3.i686.rpm hypervkvpd-debuginfo-0-0.7.el5_9.3.i686.rpm
ia64: hypervkvpd-0-0.7.el5_9.3.ia64.rpm hypervkvpd-debuginfo-0-0.7.el5_9.3.ia64.rpm
x86_64: hypervkvpd-0-0.7.el5_9.3.x86_64.rpm hypervkvpd-debuginfo-0-0.7.el5_9.3.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/#package


Severity
low
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2013:0807-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2013:0807.html
Issue date: 2013-05-09

Topic

An updated hypervkvpd package that fixes one security issue and one bug isnow available for Red Hat Enterprise Linux 5.The Red Hat Security Response Team has rated this update as having lowsecurity impact. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available from the CVE link inthe References section.

Topics%20covered

Topics Covered

security advisory denial of service Red Hat Enterprise Linux low impact hypervkvpd

Relevant Releases Architectures

RHEL Desktop Multi OS (v. 5 client) - i386, x86_64

RHEL Virtualization (v. 5 server) - i386, ia64, x86_64

Red Hat Enterprise Linux (v. 5 server) - i386, x86_64

Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64

Bugs Fixed

877572 - CVE-2012-5532 hypervkvpd: Netlink source address validation allows denial of service

953502 - hypervkvpd dies from time to time with "KVP: Failed to open file, pool: 1"

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