| Summary: | <app-emulation/xen-4.4.0-r5: information leak via gnttab_setup_table on ARM (XSA-101) (CVE-2014-4022) | ||
|---|---|---|---|
| Product: | Gentoo Security | Reporter: | Agostino Sarubbo <ago> |
| Component: | Vulnerabilities | Assignee: | Gentoo Security <security> |
| Status: | RESOLVED FIXED | ||
| Severity: | trivial | CC: | xen |
| Priority: | Normal | ||
| Version: | unspecified | ||
| Hardware: | All | ||
| OS: | Linux | ||
| URL: | http://www.openwall.com/lists/oss-security/2014/06/25/5 | ||
| Whiteboard: | ~4 [noglsa] | ||
| Package list: | Runtime testing required: | --- | |
+*xen-4.4.0-r5 (09 Jul 2014) +*xen-4.3.2-r4 (09 Jul 2014) +*xen-4.2.4-r4 (09 Jul 2014) + + 09 Jul 2014; Yixun Lan <dlan@gentoo.org> +xen-4.2.4-r4.ebuild, + +xen-4.3.2-r4.ebuild, +xen-4.4.0-r5.ebuild: + bump stable/security patches, fix bug 515106, 513824 CVE-2014-4022 (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2014-4022): The alloc_domain_struct function in arch/arm/domain.c in Xen 4.4.x, when running on an ARM platform, does not properly initialize the structure containing the grant table pages for a domain, which allows local guest administrators to obtain sensitive information via the GNTTABOP_setup_table subhypercall. Maintainer(s), Thank you for cleanup! No GLSA needed as there are no stable versions. |
From ${URL} : Xen Security Advisory XSA-101 version 2 information leak via gnttab_setup_table on ARM UPDATES IN VERSION 2 ==================== Public release. ISSUE DESCRIPTION ================= When initialising an internal data structure on ARM platform Xen was not correctly initialising the memory containing the list of a domain's grant table pages. This list is returned by the GNTTABOP_setup_table subhypercall, leading to an information leak. IMPACT ====== Malicious guest administrators can obtain some of the memory contents of other domains: Up to 8*max_nr_grant_frames bytes of uninitialised memory can be leaked to the calling domain. This memory may have been previously used by either the hypervisor or other guests. The default max_nr_grant_frames is 32, hence by default 256 bytes may be leaked in this way. However this can be overridden via the "gnttab_max_nr_frames" hypervisor command line option. VULNERABLE SYSTEMS ================== Both 32- and 64-bit ARM systems are vulnerable from Xen 4.4 onward. MITIGATION ========== None. CREDITS ======= This issue was discovered by Julien Grall. RESOLUTION ========== Applying the attached patch resolves this issue. xsa101.patch xen-unstable, Xen 4.4.x @maintainer(s): since the package or the affected version has never been marked as stable, we don't need to stabilize it. After the bump, please remove the affected versions from the tree.