#VU40723 Improper access control in QEMU - CVE-2015-4106

Vulnerability identifier: #VU40723

Vulnerability risk: High

CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2015-4106

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
QEMU
Client/Desktop applications / Virtualization software

Vendor: QEMU

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

QEMU does not properly restrict write access to the PCI config space for certain PCI pass-through devices, which might allow local x86 HVM guests to gain privileges, cause a denial of service (host crash), obtain sensitive information, or possibly have other unspecified impact via unknown vectors.

Mitigation
Install update from vendor's website.

Vulnerable software versions

QEMU: All versions

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External links
https://lists.fedoraproject.org/pipermail/package-announce/2015-June/160154.html
https://lists.fedoraproject.org/pipermail/package-announce/2015-June/160171.html
https://lists.fedoraproject.org/pipermail/package-announce/2015-June/160685.html
https://lists.opensuse.org/opensuse-security-announce/2015-06/msg00004.html
https://lists.opensuse.org/opensuse-security-announce/2015-06/msg00007.html
https://lists.opensuse.org/opensuse-security-announce/2015-06/msg00029.html
https://lists.opensuse.org/opensuse-security-announce/2015-06/msg00030.html
https://support.citrix.com/article/CTX201145
https://www.debian.org/security/2015/dsa-3284
https://www.debian.org/security/2015/dsa-3286
https://www.securityfocus.com/bid/74949
https://www.securitytracker.com/id/1032467
https://www.ubuntu.com/usn/USN-2630-1
https://xenbits.xen.org/xsa/advisory-131.html
https://security.gentoo.org/glsa/201604-03
https://support.citrix.com/article/CTX206006

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.