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Gentoo: GLSA-201703-07 Normal: Privilege Escalation in Xen Hypervisor

gentoo
Calendar Grey March 28, 2017
Dist Gentoo Esm H88
An issue in Ubuntu's Docker may lead to unauthorized privilege elevation, necessitating urgent software patches and corrective measures.
A vulnerability in Xen's bundled QEMU version might allow privilege escalation.

Summary

In CIRRUS_BLTMODE_MEMSYSSRC mode the bitblit copy routine cirrus_bitblt_cputovideo fails to check wethehr the specified memory region is safe.

Topics%20covered

Topics Covered

security advisory gentoo privilege escalation normal severity xen hypervisor

Resolution

All Xen Tools users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot -v ">=app-emulation/xen-tools-4.7.1-r8"

References

[ 1 ] CVE-2017-2620 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-2620

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/201703-07
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Concerns

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.

Severity: Normal
Title: Xen: Privilege Escalation
Date: March 28, 2017
Bugs: #609120
ID: 201703-07

Topics%20covered

Topics Covered

security advisory gentoo privilege escalation normal severity xen hypervisor

Synopsis

A vulnerability in Xen's bundled QEMU version might allow privilege escalation.

Background

Xen is a bare-metal hypervisor.

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Affected Packages

------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 app-emulation/xen-tools < 4.7.1-r8 >= 4.7.1-r8

Impact

===== A local attacker could potentially execute arbitrary code with privileges of Xen (QEMU) process on the host, gain privileges on the host system, or cause a Denial of Service condition.

Workaround

Running guests in Paravirtualization (PV) mode, or running guests in Hardware-assisted virtualizion (HVM) utilizing stub domains mitigate the issue. Running HVM guests with the device model in a stubdomain will mitigate the issue.
Changing the video card emulation to stdvga (stdvga=1, vga="stdvga", in the xl domain configuration) will avoid the vulnerability.

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