Vulnerability identifier: #VU32431
Vulnerability risk: Low
CVSSv4.0: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID:
CWE-ID:
CWE-264
Exploitation vector: Local
Exploit availability: No
Vulnerable software:
Xen
Server applications /
Virtualization software
Vendor: Xen Project
Description
The vulnerability allows a local non-authenticated attacker to perform a denial of service (DoS) attack.
QEMU, as used in Xen 3.3.x through 4.5.x, does not properly restrict access to PCI command registers, which might allow local HVM guest users to cause a denial of service (non-maskable interrupt and host crash) by disabling the (1) memory or (2) I/O decoding for a PCI Express device and then accessing the device, which triggers an Unsupported Request (UR) response.
Mitigation
Install update from vendor's website.
Vulnerable software versions
Xen: 3.3.0 - 3.3.2
External links
https://lists.fedoraproject.org/pipermail/package-announce/2015-April/154574.html
https://lists.fedoraproject.org/pipermail/package-announce/2015-April/154579.html
https://lists.fedoraproject.org/pipermail/package-announce/2015-April/155198.html
https://lists.nongnu.org/archive/html/qemu-devel/2015-03/msg06179.html
https://lists.opensuse.org/opensuse-security-announce/2015-04/msg00014.html
https://support.citrix.com/article/CTX201145
https://www.debian.org/security/2015/dsa-3259
https://www.securityfocus.com/bid/72577
https://www.securitytracker.com/id/1031998
https://www.ubuntu.com/usn/USN-2608-1
https://xenbits.xen.org/xsa/advisory-126.html
https://security.gentoo.org/glsa/201504-04
https://support.citrix.com/article/CTX206006
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.