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Canonical CNA: add info for CVE-2020-8834

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Signed-off-by: Steve Beattie <steve.beattie@canonical.com>
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Steve Beattie 2020-04-09 14:56:09 -07:00
parent 67ad68b7cf
commit da94ea0d48
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1 changed files with 108 additions and 7 deletions
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2020/8xxx/CVE-2020-8834.json
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{
"data_type": "CVE",
"data_format": "MITRE",
"data_version": "4.0",
"CVE_data_meta": {
"ASSIGNER": "security@ubuntu.com",
"DATE_PUBLIC": "2020-04-06T16:00:00.000Z",
"ID": "CVE-2020-8834",
"ASSIGNER": "cve@mitre.org",
"STATE": "RESERVED"
"STATE": "PUBLIC",
"TITLE": "Linux kernel KVM Power8 conflicting use of HSTATE_HOST_R1"
},
"affects": {
"vendor": {
"vendor_data": [
{
"product": {
"product_data": [
{
"product_name": "Linux kernel",
"version": {
"version_data": [
{
"platform": "PPC Power8",
"version_affected": ">=",
"version_value": "4.8"
},
{
"platform": "PPC Power8",
"version_affected": "<",
"version_value": "4.18"
}
]
}
}
]
},
"vendor_name": "Linux kernel"
}
]
}
},
"credit": [
{
"lang": "eng",
"value": "Gustavo Romero"
},
{
"lang": "eng",
"value": "Paul Mackerras"
}
],
"data_format": "MITRE",
"data_type": "CVE",
"data_version": "4.0",
"description": {
"description_data": [
{
"lang": "eng",
"value": "** RESERVED ** This candidate has been reserved by an organization or individual that will use it when announcing a new security problem. When the candidate has been publicized, the details for this candidate will be provided."
"value": "KVM in the Linux kernel on Power8 processors has a conflicting use of HSTATE_HOST_R1 to store r1 state in kvmppc_hv_entry plus in kvmppc_{save,restore}_tm, leading to a stack corruption. Because of this, an attacker with the ability run code in kernel space of a guest VM can cause the host kernel to panic.\n\nThere were two commits that, according to the reporter, introduced the vulnerability: \n \n f024ee098476 (\"KVM: PPC: Book3S HV: Pull out TM state save/restore into separate procedures\") \n 87a11bb6a7f7 (\"KVM: PPC: Book3S HV: Work around XER[SO] bug in fake suspend mode\") \n \nThe former landed in 4.8, the latter in 4.17. This was fixed without realizing the impact in 4.18 with the following three commits, though it's believed the first is the only strictly necessary commit: \n \n 6f597c6b63b6 (\"KVM: PPC: Book3S PR: Add guest MSR parameter for kvmppc_save_tm()/kvmppc_restore_tm()\")\n 7b0e827c6970 (\"KVM: PPC: Book3S HV: Factor fake-suspend handling out of kvmppc_save/restore_tm\")\n 009c872a8bc4 (\"KVM: PPC: Book3S PR: Move kvmppc_save_tm/kvmppc_restore_tm to separate file\") \n\n"
}
]
},
"generator": {
"engine": "Vulnogram 0.0.9"
},
"impact": {
"cvss": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
"version": "3.1"
}
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "eng",
"value": "CWE-368"
}
]
}
]
},
"references": {
"reference_data": [
{
"refsource": "CONFIRM",
"url": "https://www.openwall.com/lists/oss-security/2020/04/06/2"
},
{
"refsource": "UBUNTU",
"url": "https://usn.ubuntu.com/usn/usn-4318-1"
},
{
"refsource": "CONFIRM",
"url": "https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1867717"
}
]
},
"solution": [
{
"lang": "eng",
"value": "Apply the following three Linux kernel commits, though possibly only the first commit is strictly necessary: \n \n 6f597c6b63b6 (\"KVM: PPC: Book3S PR: Add guest MSR parameter for kvmppc_save_tm()/kvmppc_restore_tm()\")\n 7b0e827c6970 (\"KVM: PPC: Book3S HV: Factor fake-suspend handling out of kvmppc_save/restore_tm\")\n 009c872a8bc4 (\"KVM: PPC: Book3S PR: Move kvmppc_save_tm/kvmppc_restore_tm to separate file\") "
}
],
"source": {
"defect": [
"https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1867717"
],
"discovery": "EXTERNAL"
}
}
}