Race condition in xen (Alpine package)



Published: 2020-04-04
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-17341
CWE-ID CWE-362
Exploitation vector Local
Public exploit N/A
Vulnerable software
Subscribe 		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) Race condition

EUVDB-ID: #VU17906

Risk: Low

CVSSv3.1: 6.1 [CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-17341

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

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a race condition when adding a passed-through PCI device to a domain after it was already started that results in the necessity to construct the IOMMU page tables on the fly therefore creating an attack window by allowing write access to the PV guests.

A local user can use a specially crafted application to perform write operations and alter such page tables without Xen auditing the changes that may result in execution of arbitrary code with hypervisor privileges.

Mitigation

Install update from vendor's website.

Vulnerable software versions

xen (Alpine package): 4.7.0-r0 - 4.11.4-r0

External links

http://git.alpinelinux.org/aports/commit/?id=e42bcd9d2c39e861c980adebf91418ddbe72bd21


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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