CVE-2019-18420
Xen x86 PV Guest Denial of Service
Description
An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to cause a denial of service via a VCPUOP_initialise hypercall. hypercall_create_continuation() is a variadic function which uses a printf-like format string to interpret its parameters. Error handling for a bad format character was done using BUG(), which crashes Xen. One path, via the VCPUOP_initialise hypercall, has a bad format character. The BUG() can be hit if VCPUOP_initialise executes for a sufficiently long period of time for a continuation to be created. Malicious guests may cause a hypervisor crash, resulting in a Denial of Service (DoS). Xen versions 4.6 and newer are vulnerable. Xen versions 4.5 and earlier are not vulnerable. Only x86 PV guests can exploit the vulnerability. HVM and PVH guests, and guests on ARM systems, cannot exploit the vulnerability.
INFO
Published Date :
Oct. 31, 2019, 2:15 p.m.
Last Modified :
Nov. 7, 2023, 3:06 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
2.8
Affected Products
The following products are affected by CVE-2019-18420
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2019-18420.
| URL | Resource |
|---|---|
| http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00037.html | Broken Link Mailing List Third Party Advisory |
| http://www.openwall.com/lists/oss-security/2019/10/31/1 | Mailing List Patch Third Party Advisory |
| http://xenbits.xen.org/xsa/advisory-296.html | Patch Vendor Advisory |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2BQKX7M2RHCWDBKNPX4KEBI3MJIH6AYZ/ | |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I5WWPW4BSZDDW7VHU427XTVXV7ROOFFW/ | |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IZYATWNUGHRBG6I3TC24YHP5Y3J7I6KH/ | |
| https://seclists.org/bugtraq/2020/Jan/21 | Mailing List Third Party Advisory |
| https://security.gentoo.org/glsa/202003-56 | Third Party Advisory |
| https://www.debian.org/security/2020/dsa-4602 | Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2019-18420 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2019-18420 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Nov. 07, 2023
Action Type Old Value New Value Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2BQKX7M2RHCWDBKNPX4KEBI3MJIH6AYZ/ [No types assigned] Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I5WWPW4BSZDDW7VHU427XTVXV7ROOFFW/ [No types assigned] Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IZYATWNUGHRBG6I3TC24YHP5Y3J7I6KH/ [No types assigned] Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/2BQKX7M2RHCWDBKNPX4KEBI3MJIH6AYZ/ Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/I5WWPW4BSZDDW7VHU427XTVXV7ROOFFW/ Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/IZYATWNUGHRBG6I3TC24YHP5Y3J7I6KH/ -
Modified Analysis by [email protected]
Feb. 23, 2023
Action Type Old Value New Value Changed Reference Type http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00037.html No Types Assigned http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00037.html Broken Link, Mailing List, Third Party Advisory Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/2BQKX7M2RHCWDBKNPX4KEBI3MJIH6AYZ/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/2BQKX7M2RHCWDBKNPX4KEBI3MJIH6AYZ/ Mailing List, Third Party Advisory Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/I5WWPW4BSZDDW7VHU427XTVXV7ROOFFW/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/I5WWPW4BSZDDW7VHU427XTVXV7ROOFFW/ Mailing List, Third Party Advisory Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/IZYATWNUGHRBG6I3TC24YHP5Y3J7I6KH/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/IZYATWNUGHRBG6I3TC24YHP5Y3J7I6KH/ Mailing List, Third Party Advisory Changed Reference Type https://seclists.org/bugtraq/2020/Jan/21 No Types Assigned https://seclists.org/bugtraq/2020/Jan/21 Mailing List, Third Party Advisory Changed Reference Type https://security.gentoo.org/glsa/202003-56 No Types Assigned https://security.gentoo.org/glsa/202003-56 Third Party Advisory Changed Reference Type https://www.debian.org/security/2020/dsa-4602 No Types Assigned https://www.debian.org/security/2020/dsa-4602 Third Party Advisory Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* -
CWE Remap by [email protected]
Aug. 24, 2020
Action Type Old Value New Value Changed CWE CWE-20 CWE-134 -
CVE Modified by [email protected]
Mar. 26, 2020
Action Type Old Value New Value Added Reference https://security.gentoo.org/glsa/202003-56 [No Types Assigned] -
CVE Modified by [email protected]
Jan. 14, 2020
Action Type Old Value New Value Added Reference https://seclists.org/bugtraq/2020/Jan/21 [No Types Assigned] -
CVE Modified by [email protected]
Jan. 14, 2020
Action Type Old Value New Value Added Reference https://www.debian.org/security/2020/dsa-4602 [No Types Assigned] -
CVE Modified by [email protected]
Nov. 28, 2019
Action Type Old Value New Value Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/IZYATWNUGHRBG6I3TC24YHP5Y3J7I6KH/ [No Types Assigned] -
CVE Modified by [email protected]
Nov. 19, 2019
Action Type Old Value New Value Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/I5WWPW4BSZDDW7VHU427XTVXV7ROOFFW/ [No Types Assigned] -
CVE Modified by [email protected]
Nov. 17, 2019
Action Type Old Value New Value Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/2BQKX7M2RHCWDBKNPX4KEBI3MJIH6AYZ/ [No Types Assigned] -
CVE Modified by [email protected]
Nov. 14, 2019
Action Type Old Value New Value Added Reference http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00037.html [No Types Assigned] -
Initial Analysis by [email protected]
Nov. 06, 2019
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:M/Au:S/C:N/I:N/A:C) Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Changed Reference Type http://www.openwall.com/lists/oss-security/2019/10/31/1 No Types Assigned http://www.openwall.com/lists/oss-security/2019/10/31/1 Mailing List, Patch, Third Party Advisory Changed Reference Type http://xenbits.xen.org/xsa/advisory-296.html No Types Assigned http://xenbits.xen.org/xsa/advisory-296.html Patch, Vendor Advisory Added CWE NIST CWE-20 Added CPE Configuration OR *cpe:2.3:o:xen:xen:*:*:*:*:*:*:x86:* versions up to (including) 4.12.1 -
CVE Modified by [email protected]
Oct. 31, 2019
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2019/10/31/1 [No Types Assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2019-18420 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2019-18420
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.83 }} -0.30%
score
0.80005
percentile