Permissions, Privileges, and Access Controls in xen (Alpine package)



Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2016-9386
CWE-ID CWE-264
Exploitation vector Local
Public exploit N/A
Vulnerable software
 xen (Alpine package)
Operating systems & Components / Operating system package or component

Vendor Alpine Linux Development Team

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU32214

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2016-9386

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a local authenticated user to execute arbitrary code.

The x86 emulator in Xen does not properly treat x86 NULL segments as unusable when accessing memory, which might allow local HVM guest users to gain privileges via vectors involving "unexpected" base/limit values.

Mitigation

Install update from vendor's website.

Vulnerable software versions

xen (Alpine package): 4.5.3-r1

CPE2.3 External links

https://git.alpinelinux.org/aports/commit/?id=473c36a9c87f281b12c59f519ab621ff620a7062
https://git.alpinelinux.org/aports/commit/?id=9bd4f34be948ebfa595d57f19e164b329c94ef70
https://git.alpinelinux.org/aports/commit/?id=ef362e4b0451d7206239a58f9ca6c6389652b7a9


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.



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