#VU42511 Resource management error in Xen - CVE-2011-2901

Vulnerability identifier: #VU42511

Vulnerability risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2011-2901

CWE-ID: CWE-399

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description

The vulnerability allows a remote #AU# to perform a denial of service (DoS) attack.

Off-by-one error in the __addr_ok macro in Xen 3.3 and earlier allows local 64 bit PV guest administrators to cause a denial of service (host crash) via unspecified hypercalls that ignore virtual-address bits.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Xen: 3.0.2 - 3.2.3

---

External links
https://rhn.redhat.com/errata/RHSA-2011-1212.html
https://secunia.com/advisories/55082
https://security.gentoo.org/glsa/glsa-201309-24.xml
https://www.openwall.com/lists/oss-security/2011/09/02/2
https://bugzilla.redhat.com/show_bug.cgi?id=728042

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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