CVE-2019-19579
CVSS V2 High 7.2
CVSS V3 Medium 6.8
Description
An issue was discovered in Xen through 4.12.x allowing attackers to gain host OS privileges via DMA in a situation where an untrusted domain has access to a physical device (and assignable-add is not used), because of an incomplete fix for CVE-2019-18424. XSA-302 relies on the use of libxl's "assignable-add" feature to prepare devices to be assigned to untrusted guests. Unfortunately, this is not considered a strictly required step for device assignment. The PCI passthrough documentation on the wiki describes alternate ways of preparing devices for assignment, and libvirt uses its own ways as well. Hosts where these "alternate" methods are used will still leave the system in a vulnerable state after the device comes back from a guest. An untrusted domain with access to a physical device can DMA into host memory, leading to privilege escalation. Only systems where guests are given direct access to physical devices capable of DMA (PCI pass-through) are vulnerable. Systems which do not use PCI pass-through are not vulnerable.
Overview
- CVE ID
- CVE-2019-19579
- Assigner
- cve@mitre.org
- Vulnerability Status
- Modified
- Published Version
- 2019-12-04T22:15:15
- Last Modified Date
- 2020-01-14T01:15:13
Weakness Enumerations
CPE Configuration (Product)
CPE | Vulnerable | Operator | Version Start | Version End |
---|---|---|---|---|
cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:* | 1 | OR | 4.12.1 | |
cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:* | 1 | OR |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:L/AC:L/Au:N/C:C/I:C/A:C
- Access Vector
- LOCAL
- Access Compatibility
- LOW
- Authentication
- NONE
- Confidentiality Impact
- COMPLETE
- Integrity Impact
- COMPLETE
- Availability Impact
- COMPLETE
- Base Score
- 7.2
- Severity
- HIGH
- Exploitability Score
- 3.9
- Impact Score
- 10
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Attack Vector
- PHYSICAL
- Attack Compatibility
- LOW
- Privileges Required
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality Impact
- HIGH
- Availability Impact
- HIGH
- Base Score
- 6.8
- Base Severity
- MEDIUM
- Exploitability Score
- 0.9
- Impact Score
- 5.9
References
Reference URL | Reference Tags |
---|---|
https://www.openwall.com/lists/oss-security/2019/11/26/2 | Mailing List Third Party Advisory |
https://xenbits.xen.org/xsa/advisory-306.html | Vendor Advisory |
http://www.openwall.com/lists/oss-security/2019/12/05/7 | Mailing List Third Party Advisory |
http://xenbits.xen.org/xsa/advisory-306.html | Vendor Advisory |
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RJYT5FNGM7JSVHHW6B22TSAATBOAPFPD/ | Third Party Advisory |
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00011.html | |
https://www.debian.org/security/2020/dsa-4602 | |
https://seclists.org/bugtraq/2020/Jan/21 |
Sources
Source Name | Source URL |
---|---|
NIST | https://nvd.nist.gov/vuln/detail/CVE-2019-19579 |
MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-19579 |
History
Created | Old Value | New Value | Data Type | Notes |
---|---|---|---|---|
2022-05-10 16:53:50 | Added to TrackCVE | |||
2022-12-04 07:24:16 | 2019-12-04T22:15Z | 2019-12-04T22:15:15 | CVE Published Date | updated |
2022-12-04 07:24:16 | 2020-01-14T01:15:13 | CVE Modified Date | updated | |
2022-12-04 07:24:16 | Modified | Vulnerability Status | updated |