The (1) do_send and (2) do_recv functions in io.c in libvchan in Xen 4.2.x, 4.3.x, and 4.4-RC series allows local guests to cause a denial of service or possibly gain privileges via crafted xenstore ring indexes, which triggers a "read or write past the end of the ring."
CVSS Severity (version 2.0):
Impact Subscore: 6.4
Exploitability Subscore: 4.4
CVSS Version 2 Metrics:
Access Vector: Local network exploitable
Access Complexity: Medium
Authentication: Required to exploit
Impact Type: Allows unauthorized disclosure of information; Allows unauthorized modification; Allows disruption of service
References to Advisories, Solutions, and Tools
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[oss-security] 20140210 Xen Security Advisory 86 (CVE-2014-1896) - libvchan failure handling malicious ring indexes
Advisory; Patch Information
[oss-security] 20140207 Re: Xen Security Advisory 84 - integer overflow in several XSM/Flask hypercalls