CVE-2018-12893
Summary
| CVE | CVE-2018-12893 |
|---|---|
| State | PUBLIC |
| Assigner | [email protected] |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2018-07-02 17:29:00 UTC |
| Updated | 2019-10-03 00:03:00 UTC |
| Description | An issue was discovered in Xen through 4.10.x. One of the fixes in XSA-260 added some safety checks to help prevent Xen livelocking with debug exceptions. Unfortunately, due to an oversight, at least one of these safety checks can be triggered by a guest. A malicious PV guest can crash Xen, leading to a Denial of Service. All Xen systems which have applied the XSA-260 fix are vulnerable. Only x86 systems are vulnerable. ARM systems are not vulnerable. Only x86 PV guests can exploit the vulnerability. x86 HVM and PVH guests cannot exploit the vulnerability. An attacker needs to be able to control hardware debugging facilities to exploit the vulnerability, but such permissions are typically available to unprivileged users. |
Risk And Classification
Problem Types: NVD-CWE-noinfo
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Operating System | Debian | Debian Linux | 9.0 | All | All | All |
| Operating System | Debian | Debian Linux | 9.0 | All | All | All |
| Operating System | Xen | Xen | All | All | All | All |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| [SECURITY] [DLA 1577-1] xen security update | MLIST | lists.debian.org | |
| Xen: Multiple vulnerabilities (GLSA 201810-06) — Gentoo security | GENTOO | security.gentoo.org | |
| Xen Debug Exception Trigger Lets Local Users on a Guest System Cause Denial of Service Conditions on the Host System - SecurityTracker | SECTRACK | www.securitytracker.com | Third Party Advisory, VDB Entry |
| oss-security - Xen Security Advisory 265 (CVE-2018-12893) - x86: #DB exception safety check can be triggered by a guest | MLIST | www.openwall.com | Mailing List, Mitigation, Patch, Third Party Advisory |
| Xen CVE-2018-12893 Local Denial of Service Vulnerability | BID | www.securityfocus.com | Third Party Advisory, VDB Entry |
| Bug 1590979 – CVE-2018-12893 xen: x86 DB exception safety check can be triggered by a guest (XSA-265) | CONFIRM | bugzilla.redhat.com | Issue Tracking, Mitigation, Third Party Advisory |
| Debian -- Security Information -- DSA-4236-1 xen | DEBIAN | www.debian.org | Third Party Advisory |
| Citrix XenServer Multiple Security Updates | CONFIRM | support.citrix.com | Vendor Advisory |
| XSA-265 - Xen Security Advisories | CONFIRM | xenbits.xen.org | Mitigation, Patch, Vendor Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.