Vulnerability identifier: #VU42177

Vulnerability risk: Medium

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-2011-1780

CWE-ID: CWE-20

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

The instruction emulation in Xen 3.0.3 allows local SMP guest users to cause a denial of service (host crash) by replacing the instruction that causes the VM to exit in one thread with a different instruction in a different thread.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Xen: 3.0.3

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External links
http://rhn.redhat.com/errata/RHSA-2011-1065.html
http://rhn.redhat.com/errata/RHSA-2011-1163.html
http://www.openwall.com/lists/oss-security/2011/07/07/3
http://bugzilla.redhat.com/show_bug.cgi?id=702657

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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.