Fedora 21 update for xen

Published: 2015-09-15 | Updated: 2025-04-24

Risk	High
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2015-5166 CVE-2015-5165
CWE-ID	CWE-264 CWE-200
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	Fedora Operating systems & Components / Operating system xen Operating systems & Components / Operating system package or component
Vendor	Fedoraproject

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU40677

Risk: High

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2015-5166

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

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

Use-after-free vulnerability in QEMU in Xen 4.5.x and earlier does not completely unplug emulated block devices, which allows local HVM guest users to gain privileges by unplugging a block device twice.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 21

xen: before 4.4.3-3.fc21

CPE2.3

External links

https://bodhi.fedoraproject.org/updates/FEDORA-2015-15946

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Information disclosure

EUVDB-ID: #VU32393

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2015-5165

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor