#VU32217 Input validation error in Xen - CVE-2016-9380

Vulnerability identifier: #VU32217

Vulnerability risk: Low

CVSSv4.0: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:U/U:Clear]

CVE-ID: CVE-2016-9380

CWE-ID: CWE-20

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description

The vulnerability allows a local authenticated user to read and manipulate data.

The pygrub boot loader emulator in Xen, when nul-delimited output format is requested, allows local pygrub-using guest OS administrators to read or delete arbitrary files on the host via NUL bytes in the bootloader configuration file.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Xen: 4.24

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External links
https://www.securityfocus.com/bid/94473
https://www.securitytracker.com/id/1037347
https://xenbits.xen.org/xsa/advisory-198.html
https://xenbits.xen.org/xsa/xsa198.patch
https://security.gentoo.org/glsa/201612-56
https://support.citrix.com/article/CTX218775

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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.