Race condition in xen (Alpine package)



Published: 2020-09-23
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-25604
CWE-ID CWE-362
Exploitation vector Network
Public exploit N/A
Vulnerable software
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xen (Alpine package)
Operating systems & Components / Operating system package or component

Vendor Alpine Linux Development Team

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Race condition

EUVDB-ID: #VU46970

Risk: Medium

CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-25604

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Exploit availability: No

Description

The vulnerability allows a remote user to perform a denial of service (Dos) attack.

The vulnerability exists due to a race condition when migrating timers between x86 HVM vCPU-s in Xen. A remote user on a guest operating system can run a specially crafted program to crash the hypervisor.

Mitigation

Install update from vendor's website.

Vulnerable software versions

xen (Alpine package): 4.10.1-r0 - 4.14.0-r0

External links

http://git.alpinelinux.org/aports/commit/?id=f48590ae54ca9e0c3bf6b3fae3e6b065f14223e3


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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



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