#VU40714 Input validation error in Xen - CVE-2015-4163

Vulnerability identifier: #VU40714

Vulnerability risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2015-4163

CWE-ID: CWE-20

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description

The vulnerability allows local guest domains to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can cause a denial of service (NULL pointer dereference) via a hypercall without a GNTTABOP_setup_table or GNTTABOP_set_version.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Xen: 4.2.0 - 4.5.0

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External links
https://lists.opensuse.org/opensuse-security-announce/2015-06/msg00004.html
https://lists.opensuse.org/opensuse-security-announce/2015-06/msg00007.html
https://lists.opensuse.org/opensuse-security-announce/2015-06/msg00030.html
https://support.citrix.com/article/CTX201145
https://www.debian.org/security/2015/dsa-3286
https://www.securityfocus.com/bid/75141
https://www.securitytracker.com/id/1032568
https://xenbits.xen.org/xsa/advisory-134.html
https://security.gentoo.org/glsa/201604-03
https://support.citrix.com/article/CTX206006

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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.