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From aa85786b2868f5d2372d98e5630dd0be32997f18 Mon Sep 17 00:00:00 2001
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Message-Id: <aa85786b2868f5d2372d98e5630dd0be32997f18@dist-git>
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From: Eric Blake <eblake@redhat.com>
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Date: Thu, 6 Nov 2014 09:56:08 +0100
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Subject: [PATCH] CVE-2014-7823: dumpxml: security hole with migratable flag
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Commit 28f8dfd (v1.0.0) introduced a security hole: in at least
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the qemu implementation of virDomainGetXMLDesc, the use of the
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flag VIR_DOMAIN_XML_MIGRATABLE (which is usable from a read-only
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connection) triggers the implicit use of VIR_DOMAIN_XML_SECURE
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prior to calling qemuDomainFormatXML. However, the use of
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VIR_DOMAIN_XML_SECURE is supposed to be restricted to read-write
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clients only. This patch treats the migratable flag as requiring
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the same permissions, rather than analyzing what might break if
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migratable xml no longer includes secret information.
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Fortunately, the information leak is low-risk: all that is gated
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by the VIR_DOMAIN_XML_SECURE flag is the VNC connection password;
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but VNC passwords are already weak (FIPS forbids their use, and
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on a non-FIPS machine, anyone stupid enough to trust a max-8-byte
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password sent in plaintext over the network deserves what they
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get). SPICE offers better security than VNC, and all other
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secrets are properly protected by use of virSecret associations
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rather than direct output in domain XML.
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* src/remote/remote_protocol.x (REMOTE_PROC_DOMAIN_GET_XML_DESC):
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Tighten rules on use of migratable flag.
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* src/libvirt-domain.c (virDomainGetXMLDesc): Likewise.
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Signed-off-by: Eric Blake <eblake@redhat.com>
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(cherry picked from commit b1674ad5a97441b7e1bd5f5ebaff498ef2fbb11b)
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Conflicts:
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src/libvirt-domain.c - file split from older src/libvirt.c; context with older virLibConnError
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Signed-off-by: Eric Blake <eblake@redhat.com>
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Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
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---
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src/libvirt.c | 3 ++-
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src/remote/remote_protocol.x | 1 +
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2 files changed, 3 insertions(+), 1 deletion(-)
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diff --git a/src/libvirt.c b/src/libvirt.c
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index af94326..cbcc24b 100644
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--- a/src/libvirt.c
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+++ b/src/libvirt.c
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@@ -4576,7 +4576,8 @@ virDomainGetXMLDesc(virDomainPtr domain, unsigned int flags)
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conn = domain->conn;
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- if ((conn->flags & VIR_CONNECT_RO) && (flags & VIR_DOMAIN_XML_SECURE)) {
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+ if ((conn->flags & VIR_CONNECT_RO) &&
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+ (flags & (VIR_DOMAIN_XML_SECURE | VIR_DOMAIN_XML_MIGRATABLE))) {
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virLibConnError(VIR_ERR_OPERATION_DENIED, "%s",
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_("virDomainGetXMLDesc with secure flag"));
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goto error;
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diff --git a/src/remote/remote_protocol.x b/src/remote/remote_protocol.x
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index ab8216e..a1298dd 100644
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--- a/src/remote/remote_protocol.x
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+++ b/src/remote/remote_protocol.x
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@@ -2979,6 +2979,7 @@ enum remote_procedure {
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* @generate: both
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* @acl: domain:read
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* @acl: domain:read_secure:VIR_DOMAIN_XML_SECURE
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+ * @acl: domain:read_secure:VIR_DOMAIN_XML_MIGRATABLE
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*/
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REMOTE_PROC_DOMAIN_GET_XML_DESC = 14,
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--
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2.2.0
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