Privilege escalation in Xen

1) Off-by-one

EUVDB-ID: #VU48639

Risk: Medium

CVSSv3.1: 6.2 [CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-193 - Off-by-one Error

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to an off-by-one error. A local user on the HVM or PVH system can run a specially crafted program on the guest OS, trigger an off-by-one error and execute arbitrary code on the hypervisor.

Note, the vulnerability exists due to incorrect patch of vulnerability #VU48638.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Xen: 4.2.0 - 4.14.0

External links

http://xenbits.xen.org/xsa/advisory-355.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.