Privilege escalation in xen (Alpine package)

1) 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

Description

The 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.

Mitigation

Install update from vendor's website.

Vulnerable software versions

xen (Alpine package): 4.6.0-r0 - 4.6.3-r12

External links

http://git.alpinelinux.org/aports/commit/?id=777808728eee590185d5d0f60357c3e334fa40cd
http://git.alpinelinux.org/aports/commit/?id=88fbbb90ca25cd6378753538feb327abf36a30ac
http://git.alpinelinux.org/aports/commit/?id=91aea7ba80331c34e950b9ccb02e757d4471325c
http://git.alpinelinux.org/aports/commit/?id=4e31617722f0cbfc0e07928c7cc27aca51e667d8
http://git.alpinelinux.org/aports/commit/?id=d19612e9b3adfc33b29c071630e17fd1a15f36cd
http://git.alpinelinux.org/aports/commit/?id=48b94ffb4d6e3dda3dabb22b8c08089814fb86dc
http://git.alpinelinux.org/aports/commit/?id=605bcdc44def7408f05991fd6ecf6f7dfe7e683c

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.