Race condition in xen (Alpine package)

1) Race condition

EUVDB-ID: #VU8426

Risk: Low

CVSSv3.1: 5.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-14317

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

Exploit availability: No

Description

The vulnerability allows an adjacent attacker to cause DoS condition on the host system.

The weakness exists due to race condition in cxenstored. An adjacent attacker can shut down a virtual machine with a stubdomain, trigger a double-free memory error and cause the xenstored daemon to crash.

The vulnerability is exploitable on the systems running the C version os xenstored ("xenstored") and running devicemodel stubdomains.

Mitigation

Install update from vendor's website.

Vulnerable software versions

xen (Alpine package): 4.5.0-r0 - 4.6.3-r10

External links

http://git.alpinelinux.org/aports/commit/?id=777808728eee590185d5d0f60357c3e334fa40cd
http://git.alpinelinux.org/aports/commit/?id=88fbbb90ca25cd6378753538feb327abf36a30ac
http://git.alpinelinux.org/aports/commit/?id=91aea7ba80331c34e950b9ccb02e757d4471325c
http://git.alpinelinux.org/aports/commit/?id=902758ce76df95964c0d12e7cea24d7013cecf81
http://git.alpinelinux.org/aports/commit/?id=9e8bfa9f6da89fa610692d159505391749ab3bdf
http://git.alpinelinux.org/aports/commit/?id=37a17c61fd9573ea51e77597bf4cd57b127d48ea
http://git.alpinelinux.org/aports/commit/?id=ccc49b6e6d7e85267b83fd27bbbc66cd4c17417a

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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