From: Eric Blake Date: Sat, 1 Nov 2014 04:14:07 +0000 (-0600) Subject: CVE-2014-7823: dumpxml: security hole with migratable flag X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=b1674ad5;p=libvirt.git CVE-2014-7823: dumpxml: security hole with migratable flag Commit 28f8dfd (v1.0.0) introduced a security hole: in at least the qemu implementation of virDomainGetXMLDesc, the use of the flag VIR_DOMAIN_XML_MIGRATABLE (which is usable from a read-only connection) triggers the implicit use of VIR_DOMAIN_XML_SECURE prior to calling qemuDomainFormatXML. However, the use of VIR_DOMAIN_XML_SECURE is supposed to be restricted to read-write clients only. This patch treats the migratable flag as requiring the same permissions, rather than analyzing what might break if migratable xml no longer includes secret information. Fortunately, the information leak is low-risk: all that is gated by the VIR_DOMAIN_XML_SECURE flag is the VNC connection password; but VNC passwords are already weak (FIPS forbids their use, and on a non-FIPS machine, anyone stupid enough to trust a max-8-byte password sent in plaintext over the network deserves what they get). SPICE offers better security than VNC, and all other secrets are properly protected by use of virSecret associations rather than direct output in domain XML. * src/remote/remote_protocol.x (REMOTE_PROC_DOMAIN_GET_XML_DESC): Tighten rules on use of migratable flag. * src/libvirt-domain.c (virDomainGetXMLDesc): Likewise. Signed-off-by: Eric Blake --- diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c index 7dc31469e9..2b0defc75d 100644 --- a/src/libvirt-domain.c +++ b/src/libvirt-domain.c @@ -2607,7 +2607,8 @@ virDomainGetXMLDesc(virDomainPtr domain, unsigned int flags) virCheckDomainReturn(domain, NULL); conn = domain->conn; - if ((conn->flags & VIR_CONNECT_RO) && (flags & VIR_DOMAIN_XML_SECURE)) { + if ((conn->flags & VIR_CONNECT_RO) && + (flags & (VIR_DOMAIN_XML_SECURE | VIR_DOMAIN_XML_MIGRATABLE))) { virReportError(VIR_ERR_OPERATION_DENIED, "%s", _("virDomainGetXMLDesc with secure flag")); goto error; diff --git a/src/remote/remote_protocol.x b/src/remote/remote_protocol.x index db12cdadd0..ebf453071a 100644 --- a/src/remote/remote_protocol.x +++ b/src/remote/remote_protocol.x @@ -3255,6 +3255,7 @@ enum remote_procedure { * @generate: both * @acl: domain:read * @acl: domain:read_secure:VIR_DOMAIN_XML_SECURE + * @acl: domain:read_secure:VIR_DOMAIN_XML_MIGRATABLE */ REMOTE_PROC_DOMAIN_GET_XML_DESC = 14,