Access control error in xen (Alpine package)

1) Access control error

EUVDB-ID: #VU389

Risk: Medium

CVSSv4.0: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:A/U:Green]

CVE-ID: CVE-2016-7093

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows local user to get elevated privileges on the host system.

The vulnerability exists due to instruction pointer truncation error that allows a local administrative user on the HVM guest system to gain priviliges on the target system.

Successful exploitation of this vulnerability will result in gaining elevated privileges by the guest attacker.

Mitigation

Install update from vendor's website.

Vulnerable software versions

xen (Alpine package): 4.5.3-r0 - 4.7.6-r0

xen (Alpine package):

CPE2.3

• cpe:2.3:a:alpine:xen_alpine_package:4.5.3-r0:*:*:*:*:alpine_linux:*:3.1
• cpe:2.3:a:alpine:xen_alpine_package:4.6.3-r1:*:*:*:*:alpine_linux:*:3.3
• cpe:2.3:a:alpine:xen_alpine_package:4.7.0-r4:*:*:*:*:alpine_linux:*:3.5
• cpe:2.3:a:alpine:xen_alpine_package::*:*:*:*:alpine_linux:*:*

External links

https://git.alpinelinux.org/aports/commit/?id=68368249e3421886c66d79df3bd184f6ff617041
https://git.alpinelinux.org/aports/commit/?id=5c041535044ad1c1cedc665c2d20f860fd0d58f3
https://git.alpinelinux.org/aports/commit/?id=e0820355243b6bca932690909185512b442abafc

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.