mirror of
https://github.com/CVEProject/cvelist.git
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97 lines
4.6 KiB
JSON
97 lines
4.6 KiB
JSON
{
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"CVE_data_meta": {
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"ASSIGNER": "cve@mitre.org",
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"ID": "CVE-2019-18423",
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"STATE": "PUBLIC"
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},
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"affects": {
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"vendor": {
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"vendor_data": [
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{
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"product": {
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"product_data": [
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{
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"product_name": "n/a",
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"version": {
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"version_data": [
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{
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"version_value": "n/a"
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}
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]
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}
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}
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]
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},
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"vendor_name": "n/a"
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}
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]
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}
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},
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"data_format": "MITRE",
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"data_type": "CVE",
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"data_version": "4.0",
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"description": {
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"description_data": [
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{
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"lang": "eng",
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"value": "An issue was discovered in Xen through 4.12.x allowing ARM guest OS users to cause a denial of service via a XENMEM_add_to_physmap hypercall. p2m->max_mapped_gfn is used by the functions p2m_resolve_translation_fault() and p2m_get_entry() to sanity check guest physical frame. The rest of the code in the two functions will assume that there is a valid root table and check that with BUG_ON(). The function p2m_get_root_pointer() will ignore the unused top bits of a guest physical frame. This means that the function p2m_set_entry() will alias the frame. However, p2m->max_mapped_gfn will be updated using the original frame. It would be possible to set p2m->max_mapped_gfn high enough to cover a frame that would lead p2m_get_root_pointer() to return NULL in p2m_get_entry() and p2m_resolve_translation_fault(). Additionally, the sanity check on p2m->max_mapped_gfn is off-by-one allowing \"highest mapped + 1\" to be considered valid. However, p2m_get_root_pointer() will return NULL. The problem could be triggered with a specially crafted hypercall XENMEM_add_to_physmap{, _batch} followed by an access to an address (via hypercall or direct access) that passes the sanity check but cause p2m_get_root_pointer() to return NULL. A malicious guest administrator may cause a hypervisor crash, resulting in a Denial of Service (DoS). Xen version 4.8 and newer are vulnerable. Only Arm systems are vulnerable. x86 systems are not affected."
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}
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]
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},
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"problemtype": {
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"problemtype_data": [
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{
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"description": [
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{
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"lang": "eng",
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"value": "n/a"
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}
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]
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}
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]
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},
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"references": {
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"reference_data": [
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{
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"url": "http://xenbits.xen.org/xsa/advisory-301.html",
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"refsource": "MISC",
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"name": "http://xenbits.xen.org/xsa/advisory-301.html"
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},
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{
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"refsource": "MLIST",
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"name": "[oss-security] 20191031 Xen Security Advisory 301 v3 (CVE-2019-18423) - add-to-physmap can be abused to DoS Arm hosts",
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"url": "http://www.openwall.com/lists/oss-security/2019/10/31/4"
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},
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{
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"refsource": "FEDORA",
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"name": "FEDORA-2019-865bb16900",
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"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2BQKX7M2RHCWDBKNPX4KEBI3MJIH6AYZ/"
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},
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{
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"refsource": "FEDORA",
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"name": "FEDORA-2019-376ec5c107",
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"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/I5WWPW4BSZDDW7VHU427XTVXV7ROOFFW/"
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},
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{
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"refsource": "FEDORA",
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"name": "FEDORA-2019-cbb732f760",
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"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IZYATWNUGHRBG6I3TC24YHP5Y3J7I6KH/"
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},
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{
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"refsource": "DEBIAN",
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"name": "DSA-4602",
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"url": "https://www.debian.org/security/2020/dsa-4602"
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},
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{
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"refsource": "BUGTRAQ",
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"name": "20200114 [SECURITY] [DSA 4602-1] xen security update",
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"url": "https://seclists.org/bugtraq/2020/Jan/21"
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},
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{
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"refsource": "GENTOO",
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"name": "GLSA-202003-56",
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"url": "https://security.gentoo.org/glsa/202003-56"
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}
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]
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}
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} |