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CVE-2018-12892

Status Candidate

Overview

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.

Related Files

Gentoo Linux Security Advisory 201810-06
Posted Oct 31, 2018
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201810-6 - Multiple vulnerabilities have been found in Xen, the worst of which could cause a Denial of Service condition. Versions less than 4.10.1-r2 are affected.

tags | advisory, denial of service, vulnerability
systems | linux, gentoo
advisories | CVE-2017-5715, CVE-2017-5753, CVE-2017-5754, CVE-2018-10471, CVE-2018-10472, CVE-2018-10981, CVE-2018-10982, CVE-2018-12891, CVE-2018-12892, CVE-2018-12893, CVE-2018-15468, CVE-2018-15469, CVE-2018-15470, CVE-2018-3620, CVE-2018-3646, CVE-2018-5244, CVE-2018-7540, CVE-2018-7541, CVE-2018-7542
SHA-256 | b217f9accfba4a764bd6f85c953f7739d90f11d6b6ba34b105c6fadfa4adafee
Debian Security Advisory 4236-1
Posted Jun 29, 2018
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4236-1 - Multiple vulnerabilities have been discovered in the Xen hypervisor.

tags | advisory, vulnerability
systems | linux, debian
advisories | CVE-2018-12891, CVE-2018-12892, CVE-2018-12893
SHA-256 | bc38a7c7dcdcd73bd1df565a0d7810fd50d34a4eb9c6c879d0393737aeb23585
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