Permissions, Privileges, and Access Controls in Xen - CVE-2014-7156
Published: October 2, 2014 / Updated: July 28, 2020
Vulnerability identifier: #VU32481
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2014-7156
CWE-ID: CWE-264
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to perform service disruption.
The x86_emulate function in arch/x86/x86_emulate/x86_emulate.c in Xen 3.3.x through 4.4.x does not check the supervisor mode permissions for instructions that generate software interrupts, which allows local HVM guest users to cause a denial of service (guest crash) via unspecified vectors.
Affected software
Xen
Gentoo Linux
Fedora
xen (Alpine package)
xen
Gentoo Linux
Fedora
xen (Alpine package)
xen
How to mitigate CVE-2014-7156
Install update from vendor's website.
xen (Alpine package) - update to 4.3.3-r1
xen - update to 4.4.1-4.fc21
xen - update to 4.4.1-4.fc21
External References
- http://lists.fedoraproject.org/pipermail/package-announce/2014-October/140418.html
- http://lists.fedoraproject.org/pipermail/package-announce/2014-October/140483.html
- http://lists.opensuse.org/opensuse-security-announce/2014-10/msg00002.html
- http://lists.opensuse.org/opensuse-security-announce/2014-10/msg00003.html
- http://secunia.com/advisories/61500
- http://secunia.com/advisories/61858
- http://secunia.com/advisories/61890
- http://security.gentoo.org/glsa/glsa-201412-42.xml
- http://support.citrix.com/article/CTX200218
- http://www.debian.org/security/2014/dsa-3041
- http://www.securityfocus.com/bid/70062
- http://www.securitytracker.com/id/1030889
- http://xenbits.xen.org/xsa/advisory-106.html