CVE-2017-14318

medium
New! CVE Severity Now Using CVSS v3

The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Description

An issue was discovered in Xen 4.5.x through 4.9.x. The function `__gnttab_cache_flush` handles GNTTABOP_cache_flush grant table operations. It checks to see if the calling domain is the owner of the page that is to be operated on. If it is not, the owner's grant table is checked to see if a grant mapping to the calling domain exists for the page in question. However, the function does not check to see if the owning domain actually has a grant table or not. Some special domains, such as `DOMID_XEN`, `DOMID_IO` and `DOMID_COW` are created without grant tables. Hence, if __gnttab_cache_flush operates on a page owned by these special domains, it will attempt to dereference a NULL pointer in the domain struct.

References

http://www.securityfocus.com/bid/100817

http://www.securitytracker.com/id/1039349

http://xenbits.xen.org/xsa/advisory-232.html

https://support.citrix.com/article/CTX227185

https://www.debian.org/security/2017/dsa-4050

Details

Source: MITRE

Published: 2017-09-12

Updated: 2017-11-30

Type: CWE-476

Risk Information

CVSS v2

Base Score: 4.9

Vector: AV:L/AC:L/Au:N/C:N/I:N/A:C

Impact Score: 6.9

Exploitability Score: 3.9

Severity: MEDIUM

CVSS v3

Base Score: 6.5

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Impact Score: 4

Exploitability Score: 2

Severity: MEDIUM

Tenable Plugins

View all (12 total)

IDNameProductFamilySeverity
105848Fedora 27 : xen (2017-333ea49a63)NessusFedora Local Security Checks
high
104819Debian DSA-4050-1 : xen - security updateNessusDebian Local Security Checks
critical
103791Debian DLA-1132-1 : xen security updateNessusDebian Local Security Checks
critical
103619Fedora 25 : xen (2017-f7fd3fe7eb)NessusFedora Local Security Checks
high
103396openSUSE Security Update : xen (openSUSE-2017-1080)NessusSuSE Local Security Checks
high
103381Citrix XenServer Multiple Vulnerabilities (CTX227185)NessusMisc.
high
103328Xen Hypervisor Multiple Vulnerabilities (XSA-231 - XSA-234)NessusMisc.
high
103315SUSE SLED12 / SLES12 Security Update : xen (SUSE-SU-2017:2519-1)NessusSuSE Local Security Checks
high
103291openSUSE Security Update : xen (openSUSE-2017-1071)NessusSuSE Local Security Checks
high
103267Fedora 26 : xen (2017-e399a9008c)NessusFedora Local Security Checks
high
103246SUSE SLES12 Security Update : xen (SUSE-SU-2017:2466-1)NessusSuSE Local Security Checks
high
103177SUSE SLED12 / SLES12 Security Update : xen (SUSE-SU-2017:2420-1)NessusSuSE Local Security Checks
high