CVE-2018-15470

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 through 4.11.x. The logic in oxenstored for handling writes depended on the order of evaluation of expressions making up a tuple. As indicated in section 7.7.3 "Operations on data structures" of the OCaml manual, the order of evaluation of subexpressions is not specified. In practice, different implementations behave differently. Thus, oxenstored may not enforce the configured quota-maxentity. This allows a malicious or buggy guest to write as many xenstore entries as it wishes, causing unbounded memory usage in oxenstored. This can lead to a system-wide DoS.

References

http://xenbits.xen.org/xsa/advisory-272.html

https://lists.debian.org/debian-lts-announce/2018/11/msg00013.html

https://security.gentoo.org/glsa/201810-06

Details

Source: MITRE

Published: 2018-08-17

Updated: 2018-11-13

Type: CWE-400

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

Vulnerable Software

Configuration 1

OR

cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:* versions up to 4.11.0 (inclusive)

Tenable Plugins

View all (10 total)

IDNameProductFamilySeverity
123167openSUSE Security Update : xen (openSUSE-2019-1046) (Foreshadow)NessusSuSE Local Security Checks
high
120490Fedora 28 : xen (2018-683dfde81a) (Foreshadow)NessusFedora Local Security Checks
medium
120196SUSE SLED15 / SLES15 Security Update : xen (SUSE-SU-2018:4300-1) (Foreshadow)NessusSuSE Local Security Checks
high
119951openSUSE Security Update : xen (openSUSE-2018-1624) (Foreshadow)NessusSuSE Local Security Checks
high
118892Debian DLA-1577-1 : xen security updateNessusDebian Local Security Checks
high
118563openSUSE Security Update : xen (openSUSE-2018-1331) (Foreshadow)NessusSuSE Local Security Checks
critical
118506GLSA-201810-06 : Xen: Multiple vulnerabilities (Foreshadow) (Meltdown) (Spectre)NessusGentoo Local Security Checks
critical
118491SUSE SLED12 / SLES12 Security Update : xen (SUSE-SU-2018:3490-1) (Foreshadow)NessusSuSE Local Security Checks
critical
112234Fedora 27 : xen (2018-915602df63) (Foreshadow)NessusFedora Local Security Checks
medium
112158Xen Project Oxenstored Quota-maxentity DoS (XSA-272)NessusMisc.
medium