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Vulnerability Details : CVE-2018-12892

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.
Publish Date : 2018-07-02 Last Update Date : 2019-03-29
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- CVSS Scores & Vulnerability Types

CVSS Score
6.5
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Single system (The vulnerability requires an attacker to be logged into the system (such as at a command line or via a desktop session or web interface).)
Gained Access None
Vulnerability Type(s) Obtain Information
CWE ID 200

- Products Affected By CVE-2018-12892

# Product Type Vendor Product Version Update Edition Language
1 OS Debian Debian Linux 9.0 Version Details Vulnerabilities
2 OS XEN XEN 4.7.1 Version Details Vulnerabilities
3 OS XEN XEN 4.8.0 Version Details Vulnerabilities
4 OS XEN XEN 4.8.1 Version Details Vulnerabilities
5 OS XEN XEN 4.9.0 RC7 Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Debian Debian Linux 1
XEN XEN 4

- References For CVE-2018-12892

http://www.securityfocus.com/bid/104571
BID 104571 Xen CVE-2018-12892 Local Security Bypass Vulnerability Release Date:2018-06-27
http://www.securitytracker.com/id/1041203
SECTRACK 1041203
http://xenbits.xen.org/xsa/advisory-266.html CONFIRM
https://security.gentoo.org/glsa/201810-06
GENTOO GLSA-201810-06
https://www.debian.org/security/2018/dsa-4236
DEBIAN DSA-4236
http://www.openwall.com/lists/oss-security/2018/06/27/12
MLIST [oss-security] 20180627 Xen Security Advisory 266 (CVE-2018-12892) - libxl fails to honour readonly flag on HVM emulated SCSI disks

- Metasploit Modules Related To CVE-2018-12892

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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