CVE-2019-19578
published 2019-12-11CVE-2019-19578: An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to cause a denial of service via degenerate chains of linear pagetables, because…
PriorityP344high8.8CVSS 3.1
AVLACLPRLUINSCCHIHAH
EPSS
0.39%
31.6th percentile
An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to cause a denial of service via degenerate chains of linear pagetables, because of an incorrect fix for CVE-2017-15595. "Linear pagetables" is a technique which involves either pointing a pagetable at itself, or to another pagetable of the same or higher level. Xen has limited support for linear pagetables: A page may either point to itself, or point to another pagetable of the same level (i.e., L2 to L2, L3 to L3, and so on). XSA-240 introduced an additional restriction that limited the "depth" of such chains by allowing pages to either *point to* other pages of the same level, or *be pointed to* by other pages of the same level, but not both. To implement this, we keep track of the number of outstanding times a page points to or is pointed to another page table, to prevent both from happening at the same time. Unfortunately, the original commit introducing this reset this count when resuming validation of a partially-validated pagetable, incorrectly dropping some "linear_pt_entry" counts. If an attacker could engineer such a situation to occur, they might be able to make loops or other arbitrary chains of linear pagetables, as described in XSA-240. A malicious or buggy PV guest may cause the hypervisor to crash, resulting in Denial of Service (DoS) affecting the entire host. Privilege escalation and information leaks cannot be excluded. All versions of Xen are vulnerable. Only x86 systems are affected. Arm systems are not affected. Only x86 PV guests can leverage the vulnerability. x86 HVM and PVH guests cannot leverage the vulnerability. Only systems which have enabled linear pagetables are vulnerable. Systems which have disabled linear pagetables, either by selecting CONFIG_PV_LINEAR_PT=n when building the hypervisor, or adding pv-linear-pt=false on the command-line, are not vulnerable.
Affected
7 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | xen | < xen 4.11.3+24-g14b62ab3e5-1 (bookworm) | xen 4.11.3+24-g14b62ab3e5-1 (bookworm) |
| fedoraproject | fedora | — | — |
| xen | xen | <= 4.12.1 | — |
| xen | xen | >= 0 < 4.11.3+24-g14b62ab3e5-1 | 4.11.3+24-g14b62ab3e5-1 |
| xen | xen | >= 0 < 4.11.3+24-g14b62ab3e5-1 | 4.11.3+24-g14b62ab3e5-1 |
| xen | xen | >= 0 < 4.11.3+24-g14b62ab3e5-1 | 4.11.3+24-g14b62ab3e5-1 |
| xen | xen | >= 0 < 4.11.3+24-g14b62ab3e5-1 | 4.11.3+24-g14b62ab3e5-1 |
CVSS provenance
nvdv3.18.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
nvdv2.07.2HIGHAV:L/AC:L/Au:N/C:C/I:C/A:C
osv8.8HIGH
vendor_debian8.8HIGH
vendor_redhat8.8HIGH
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GHSA
GHSA-xm4c-wwh2-mcv8: An issue was discovered in Xen through 4
ghsa_unreviewed·2022-05-24·CVSS 8.8
CVE-2019-19578 [HIGH] GHSA-xm4c-wwh2-mcv8: An issue was discovered in Xen through 4
An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to cause a denial of service via degenerate chains of linear pagetables, because of an incorrect fix for CVE-2017-15595. "Linear pagetables" is a technique which involves either pointing a pagetable at itself, or to another pagetable of the same or higher level. Xen has limited support for linear pagetables: A page may either point to itself, or point to another pagetable of the same level (i.e., L2 to L2, L3 to L3, and so on). XSA-240 introduced an additional restriction that limited the "depth" of such chains by allowing pages to either *point to* other pages of the same level, or *be pointed to* by other pages of the same level, but not both. To implement this, we keep track of the number of outstanding times a
OSV
CVE-2019-19578: An issue was discovered in Xen through 4
osv·2019-12-11·CVSS 8.8
CVE-2019-19578 [HIGH] CVE-2019-19578: An issue was discovered in Xen through 4
An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to cause a denial of service via degenerate chains of linear pagetables, because of an incorrect fix for CVE-2017-15595. "Linear pagetables" is a technique which involves either pointing a pagetable at itself, or to another pagetable of the same or higher level. Xen has limited support for linear pagetables: A page may either point to itself, or point to another pagetable of the same level (i.e., L2 to L2, L3 to L3, and so on). XSA-240 introduced an additional restriction that limited the "depth" of such chains by allowing pages to either *point to* other pages of the same level, or *be pointed to* by other pages of the same level, but not both. To implement this, we keep track of the number of outstanding times a
Red Hat
xen: privilege escalation due to malicious PV guest (XSA-309)
vendor_redhat·2019-12-11·CVSS 8.8
CVE-2019-19578 [HIGH] CWE-400 xen: privilege escalation due to malicious PV guest (XSA-309)
xen: privilege escalation due to malicious PV guest (XSA-309)
An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to cause a denial of service via degenerate chains of linear pagetables, because of an incorrect fix for CVE-2017-15595. "Linear pagetables" is a technique which involves either pointing a pagetable at itself, or to another pagetable of the same or higher level. Xen has limited support for linear pagetables: A page may either point to itself, or point to another pagetable of the same level (i.e., L2 to L2, L3 to L3, and so on). XSA-240 introduced an additional restriction that limited the "depth" of such chains by allowing pages to either *point to* other pages of the same level, or *be pointed to* by other pages of the same level, but not both. To imp
Debian
CVE-2019-19578: xen - An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to ...
vendor_debian·2019·CVSS 8.8
CVE-2019-19578 [HIGH] CVE-2019-19578: xen - An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to ...
An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to cause a denial of service via degenerate chains of linear pagetables, because of an incorrect fix for CVE-2017-15595. "Linear pagetables" is a technique which involves either pointing a pagetable at itself, or to another pagetable of the same or higher level. Xen has limited support for linear pagetables: A page may either point to itself, or point to another pagetable of the same level (i.e., L2 to L2, L3 to L3, and so on). XSA-240 introduced an additional restriction that limited the "depth" of such chains by allowing pages to either *point to* other pages of the same level, or *be pointed to* by other pages of the same level, but not both. To implement this, we keep track of the number of outstanding times a
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2019-19578 xen: privilege escalation due to malicious PV guest (XSA-309) [fedora-all]
bugzilla·2019-12-11·CVSS 8.8
CVE-2019-19578 [HIGH] CVE-2019-19578 xen: privilege escalation due to malicious PV guest (XSA-309) [fedora-all]
CVE-2019-19578 xen: privilege escalation due to malicious PV guest (XSA-309) [fedora-all]
This is an automatically created tracking bug! It was created to ensure
that one or more security vulnerabilities are fixed in affected versions
of fedora-all.
For comments that are specific to the vulnerability please use bugs filed
against the "Security Response" product referenced in the "Blocks" field.
For more information see:
http://fedoraproject.org/wiki/Security/TrackingBugs
When submitting as an update, use the fedpkg template provided in the next
comment(s). This will include the bug IDs of this tracking bug as well as
the relevant top-level CVE bugs.
Please also mention the CVE IDs being fixed in the RPM changelog and the
fedpkg commit message.
NOTE: this issue affects multiple suppor
Bugzilla
CVE-2019-19578 xen: privilege escalation due to malicious PV guest (XSA-309)
bugzilla·2019-11-29·CVSS 8.8
CVE-2019-19578 [HIGH] CVE-2019-19578 xen: privilege escalation due to malicious PV guest (XSA-309)
CVE-2019-19578 xen: privilege escalation due to malicious PV guest (XSA-309)
An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to cause a denial of service via degenerate chains of linear pagetables, because of an incorrect fix for CVE-2017-15595. "Linear pagetables" is a technique which involves either pointing a pagetable at itself, or to another pagetable of the same or higher level. Xen has limited support for linear pagetables: A page may either point to itself, or point to another pagetable of the same level (i.e., L2 to L2, L3 to L3, and so on). XSA-240 introduced an additional restriction that limited the "depth" of such chains by allowing pages to either *point to* other pages of the same level, or *be pointed to* by other pages of the same level, but n
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00011.htmlhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/34HBFTYNMQMWIO2GGK7DB6KV4M6R5YPV/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/D5R73AYE53QA32KTMHUVKCX6E52CIS43/https://seclists.org/bugtraq/2020/Jan/21https://security.gentoo.org/glsa/202003-56https://www.debian.org/security/2020/dsa-4602https://xenbits.xen.org/xsa/advisory-309.htmlhttp://lists.opensuse.org/opensuse-security-announce/2020-01/msg00011.htmlhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/34HBFTYNMQMWIO2GGK7DB6KV4M6R5YPV/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/D5R73AYE53QA32KTMHUVKCX6E52CIS43/https://seclists.org/bugtraq/2020/Jan/21https://security.gentoo.org/glsa/202003-56https://www.debian.org/security/2020/dsa-4602https://xenbits.xen.org/xsa/advisory-309.html
2019-12-11
Published