ID CVE-2018-12893
Summary 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.
References
Vulnerable Configurations
  • cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:x86
    cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:x86
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
    cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
CVSS
Base: 2.1 (as of 03-10-2019 - 00:03)
Impact:
Exploitability:
CWE NVD-CWE-noinfo
CAPEC
Access
VectorComplexityAuthentication
LOCAL LOW NONE
Impact
ConfidentialityIntegrityAvailability
NONE NONE PARTIAL
cvss-vector via4 AV:L/AC:L/Au:N/C:N/I:N/A:P
refmap via4
bid 104572
confirm
debian DSA-4236
gentoo GLSA-201810-06
mlist
  • [debian-lts-announce] 20181112 [SECURITY] [DLA 1577-1] xen security update
  • [oss-security] 20180627 Xen Security Advisory 265 (CVE-2018-12893) - x86: #DB exception safety check can be triggered by a guest
sectrack 1041202
Last major update 03-10-2019 - 00:03
Published 02-07-2018 - 17:29
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