CVE-2018-12892
Xen QEMU SCSI Disk Write Access Vulnerability
Description
An issue was discovered in Xen 4.7 through 4.10.x. libxl fails to pass the readonly flag to qemu when setting up a SCSI disk, due to what was probably an erroneous merge conflict resolution. Malicious guest administrators or (in some situations) users may be able to write to supposedly read-only disk images. Only emulated SCSI disks (specified as "sd" in the libxl disk configuration, or an equivalent) are affected. IDE disks ("hd") are not affected (because attempts to make them readonly are rejected). Additionally, CDROM devices (that is, devices specified to be presented to the guest as CDROMs, regardless of the nature of the backing storage on the host) are not affected; they are always read only. Only systems using qemu-xen (rather than qemu-xen-traditional) as the device model version are vulnerable. Only systems using libxl or libxl-based toolstacks are vulnerable. (This includes xl, and libvirt with the libxl driver.) The vulnerability is present in Xen versions 4.7 and later. (In earlier versions, provided that the patch for XSA-142 has been applied, attempts to create read only disks are rejected.) If the host and guest together usually support PVHVM, the issue is exploitable only if the malicious guest administrator has control of the guest kernel or guest kernel command line.
INFO
Published Date :
July 2, 2018, 5:29 p.m.
Last Modified :
March 29, 2019, 4:24 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
6.0
Exploitability Score :
3.1
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-2018-12892.
| URL | Resource |
|---|---|
| http://www.openwall.com/lists/oss-security/2018/06/27/12 | Mailing List Third Party Advisory |
| http://www.securityfocus.com/bid/104571 | Third Party Advisory VDB Entry |
| http://www.securitytracker.com/id/1041203 | Third Party Advisory VDB Entry |
| http://xenbits.xen.org/xsa/advisory-266.html | Vendor Advisory |
| https://security.gentoo.org/glsa/201810-06 | Third Party Advisory |
| https://www.debian.org/security/2018/dsa-4236 | 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-2018-12892 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2018-12892 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.
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CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Modified Analysis by [email protected]
Mar. 29, 2019
Action Type Old Value New Value Changed Reference Type https://security.gentoo.org/glsa/201810-06 No Types Assigned https://security.gentoo.org/glsa/201810-06 Third Party Advisory -
CVE Modified by [email protected]
Oct. 31, 2018
Action Type Old Value New Value Added Reference https://security.gentoo.org/glsa/201810-06 [No Types Assigned] -
Initial Analysis by [email protected]
Sep. 04, 2018
Action Type Old Value New Value Added CVSS V2 (AV:N/AC:L/Au:S/C:P/I:P/A:P) Added CVSS V3 AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Changed Reference Type http://www.securityfocus.com/bid/104571 No Types Assigned http://www.securityfocus.com/bid/104571 Third Party Advisory, VDB Entry Changed Reference Type https://www.debian.org/security/2018/dsa-4236 No Types Assigned https://www.debian.org/security/2018/dsa-4236 Third Party Advisory Changed Reference Type http://www.securitytracker.com/id/1041203 No Types Assigned http://www.securitytracker.com/id/1041203 Third Party Advisory, VDB Entry Changed Reference Type http://www.openwall.com/lists/oss-security/2018/06/27/12 No Types Assigned http://www.openwall.com/lists/oss-security/2018/06/27/12 Mailing List, Third Party Advisory Changed Reference Type http://xenbits.xen.org/xsa/advisory-266.html No Types Assigned http://xenbits.xen.org/xsa/advisory-266.html Vendor Advisory Added CWE CWE-200 Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Added CPE Configuration OR *cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:* versions from (including) 4.7.0 up to (including) 4.10.1 -
CVE Modified by [email protected]
Jul. 04, 2018
Action Type Old Value New Value Added Reference https://www.debian.org/security/2018/dsa-4236 [No Types Assigned] Added Reference http://www.securitytracker.com/id/1041203 [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-2018-12892 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-2018-12892
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.74 }} -0.31%
score
0.78907
percentile