142 lines
5.7 KiB
Text
142 lines
5.7 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA512
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=============================================================================
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FreeBSD-SA-19:21.bhyve Security Advisory
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The FreeBSD Project
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Topic: Insufficient validation of guest-supplied data (e1000 device)
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Category: core
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Module: bhyve
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Announced: 2019-08-06
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Credits: Reno Robert
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Affects: All supported versions of FreeBSD.
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Corrected: 2019-08-05 22:04:16 UTC (stable/12, 12.0-STABLE)
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2019-08-06 17:13:17 UTC (releng/12.0, 12.0-RELEASE-p9)
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2019-08-05 22:04:16 UTC (stable/11, 11.3-STABLE)
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2019-08-06 17:13:17 UTC (releng/11.3, 11.3-RELEASE-p2)
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2019-08-06 17:13:17 UTC (releng/11.2, 11.2-RELEASE-p13)
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CVE Name: CVE-2019-5609
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For general information regarding FreeBSD Security Advisories,
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including descriptions of the fields above, security branches, and the
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following sections, please visit <URL:https://security.FreeBSD.org/>.
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I. Background
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bhyve(8) is a hypervisor that supports running a variety of guest operating
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systems in virtual machines. bhyve(8) includes an emulated Intel 82545
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network interface adapter ("e1000").
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II. Problem Description
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The e1000 network adapters permit a variety of modifications to an Ethernet
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packet when it is being transmitted. These include the insertion of IP and
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TCP checksums, insertion of an Ethernet VLAN header, and TCP segmentation
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offload ("TSO"). The e1000 device model uses an on-stack buffer to generate
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the modified packet header when simulating these modifications on transmitted
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packets.
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When TCP segmentation offload is requested for a transmitted packet, the
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e1000 device model used a guest-provided value to determine the size of the
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on-stack buffer without validation. The subsequent header generation could
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overflow an incorrectly sized buffer or indirect a pointer composed of stack
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garbage.
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III. Impact
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A misbehaving bhyve guest could overwrite memory in the bhyve process on the
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host.
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IV. Workaround
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Only the e1000 device model is affected; the virtio-net device is not
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affected by this issue. If supported by the guest operating system
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presenting only the virtio-net device to the guest is a suitable workaround.
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No workaround is available if the e1000 device model is required.
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V. Solution
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Upgrade your vulnerable system to a supported FreeBSD stable or
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release / security branch (releng) dated after the correction date,
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and restart any affected virtual machines.
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1) To update your vulnerable system via a binary patch:
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Systems running a RELEASE version of FreeBSD on the i386 or amd64
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platforms can be updated via the freebsd-update(8) utility:
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# freebsd-update fetch
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# freebsd-update install
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2) To update your vulnerable system via a source code patch:
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The following patches have been verified to apply to the applicable
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FreeBSD release branches.
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a) Download the relevant patch from the location below, and verify the
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detached PGP signature using your PGP utility.
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# fetch https://security.FreeBSD.org/patches/SA-19:21/bhyve.patch
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# fetch https://security.FreeBSD.org/patches/SA-19:21/bhyve.patch.asc
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# gpg --verify bhyve.patch.asc
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b) Apply the patch. Execute the following commands as root:
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# cd /usr/src
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# patch < /path/to/patch
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c) Recompile the operating system using buildworld and installworld as
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described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>.
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Restart the applicable virtual machines, or reboot the system.
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VI. Correction details
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The following list contains the correction revision numbers for each
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affected branch.
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Branch/path Revision
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- -------------------------------------------------------------------------
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stable/12/ r350619
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releng/12.0/ r350647
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stable/11/ r350619
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releng/11.3/ r350647
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releng/11.2/ r350647
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- -------------------------------------------------------------------------
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To see which files were modified by a particular revision, run the
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following command, replacing NNNNNN with the revision number, on a
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machine with Subversion installed:
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# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base
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Or visit the following URL, replacing NNNNNN with the revision number:
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<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>
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VII. References
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<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-5609>
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The latest revision of this advisory is available at
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<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-19:21.bhyve.asc>
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