Privilege escalation in Xen
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 5 |
| CVE-ID | CVE-2017-12135 CVE-2017-12137 CVE-2017-12136 CVE-2017-12134 CVE-2017-12855 |
| CWE-ID | CWE-264 |
| Exploitation vector | Local network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
Xen Server applications / Virtualization software |
| Vendor | Xen Project |
Security Bulletin
This security bulletin contains information about 5 vulnerabilities.
1) Privilege escalation
EUVDB-ID: #VU7949
Risk: Low
CVSSv3.1: 7 [CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2017-12135
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: No
DescriptionThe vulnerability allows a local attacker on the guest system to gain elevated privileges on the host system.
The weakness exists due to flaws in the processing of transitive grants. A local attacker on the guest system can escalate privileges on the host system.
Install update from vendor's website.
Xen: 4.5.0 - 4.9.0
External linkshttp://xenbits.xen.org/xsa/advisory-226.html
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Privilege escalation
EUVDB-ID: #VU7950
Risk: Medium
CVSSv3.1: 7.8 [CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2017-12137
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: No
DescriptionThe vulnerability allows a local attacker on a PV guest system to gain elevated privileges on the host system.
The weakness exists due to a flaw in the processing of guest-nominated L1 pagetable entries when mapping a grant reference. A local attacker on a PV guest system supply specially crafted data and execute arbitrary code on the host system.
Install update from vendor's website.
Xen: 4.5.0 - 4.9.0
External linkshttp://xenbits.xen.org/xsa/advisory-227.html
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
3) Privilege escalation
EUVDB-ID: #VU7951
Risk: Low
CVSSv3.1: 6.5 [CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2017-12136
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: No
DescriptionThe vulnerability allows a local administrative attacker on the guest system to gain elevated privileges on the host system.
The weakness exists due to a race condition in the grant table allocator maptrack entry list processing code. A local attacker on the guest system can cause the host system to crash or gain elevated privileges on the host system.
Install update from vendor's website.
Xen: 4.6.0 - 4.9.0
External linkshttp://xenbits.xen.org/xsa/advisory-226.html
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated privileged user via the local network (LAN).
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
4) Privilege escalation
EUVDB-ID: #VU7952
Risk: Low
CVSSv3.1: 7 [CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2017-12134
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: No
DescriptionThe vulnerability allows a local attacker on a Linux-based guest system to gain elevated privileges on the host system.
The weakness exists due to aa flaw in merging adjacent block IO requests. A local attacker on the guest system can incorrectly access memory during block stream processing to obtain potentially sensitive information or gain elevated privileges on the host system.
Install update from vendor's website.
Xen: 4.6.0 - 4.9.0
External linkshttp://xenbits.xen.org/xsa/advisory-229.html
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
5) Privilege escalation
EUVDB-ID: #VU7953
Risk: Low
CVSSv3.1: 7 [CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2017-12855
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: No
DescriptionThe vulnerability allows a local attacker on the guest system to gain elevated privileges on the host system.
The weakness exists due to flaws when clearing grant status bits. A local attacker on a guest system may modify or reuse a grant that is still in use by another domain and obtain potentially sensitive information from another guest on the target system.
a flaw when clearing grant status bits prematurely. As a result, a
guest system may modify or reuse a grant that is still in use by another
domain. A local attacker on a guest system may modify or reuse a grant that is still in use by another
domain and obtain potentially sensitive information from another guest on the
target system.
Install update from vendor's website.
Xen: 4.5.0 - 4.9.0
External linkshttp://xenbits.xen.org/xsa/advisory-230.html
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
