Input validation error in Xen - CVE-2012-0218
Published: December 3, 2012 / Updated: August 4, 2020
Vulnerability identifier: #VU33948
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2012-0218
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to perform service disruption.
Xen 3.4, 4.0, and 4.1, when the guest OS has not registered a handler for a syscall or sysenter instruction, does not properly clear a flag for exception injection when injecting a General Protection Fault, which allows local PV guest OS users to cause a denial of service (guest crash) by later triggering an exception that would normally be handled within Xen.
Affected software
Xen
Gentoo Linux
SUSE Linux
xen (Alpine package)
app-emulation/xen
app-emulation/xen-pvgrub
app-emulation/xen-tools
Gentoo Linux
SUSE Linux
xen (Alpine package)
app-emulation/xen
app-emulation/xen-pvgrub
app-emulation/xen-tools
How to mitigate CVE-2012-0218
Install update from vendor's website.
xen (Alpine package) - update to 4.1.1-r3
app-emulation/xen - update to 4.2.2-r1
app-emulation/xen-pvgrub - update to 4.2.2-r1
app-emulation/xen-tools - update to 4.2.2-r3
app-emulation/xen - update to 4.2.2-r1
app-emulation/xen-pvgrub - update to 4.2.2-r1
app-emulation/xen-tools - update to 4.2.2-r3