Canonical CNA: add CVE-2020-8835 / linux kernel / USN-4313-1

v2 changes:
- add vendor_name, product_name, and version_data
- improve formatting of mitigation section.

PR: https://github.com/CVEProject/cvelist/pull/3501
Signed-off-by: Steve Beattie <steve.beattie@canonical.com>

2020/8xxx/CVE-2020-8835.json

@@ -1,18 +1,140 @@
 {
-    "data_type": "CVE",
-    "data_format": "MITRE",
-    "data_version": "4.0",
     "CVE_data_meta": {
+        "ASSIGNER": "security@ubuntu.com",
+        "DATE_PUBLIC": "2020-03-30T16:00:00.000Z",
         "ID": "CVE-2020-8835",
-        "ASSIGNER": "cve@mitre.org",
-        "STATE": "RESERVED"
+        "STATE": "PUBLIC",
+        "TITLE": "Linux kernel bpf verifier vulnerability"
     },
+    "affects": {
+        "vendor": {
+            "vendor_data": [
+                {
+                    "product": {
+                        "product_data": [
+                            {
+                                "product_name": "Linux kernel",
+                                "version": {
+                                    "version_data": [
+                                        {
+                                            "version_affected": "<=",
+                                            "version_name": "5.6.0",
+                                            "version_value": "5.6.0"
+                                        },
+                                        {
+                                            "version_affected": "<=",
+                                            "version_name": "5.5-stable",
+                                            "version_value": "5.5.13"
+                                        },
+                                        {
+                                            "version_affected": ">=",
+                                            "version_name": "5.4-stable",
+                                            "version_value": "5.4.7"
+                                        },
+                                        {
+                                            "version_affected": "<=",
+                                            "version_name": "5.4-stable",
+                                            "version_value": "5.4.28"
+                                        }
+                                    ]
+                                }
+                            }
+                        ]
+                    },
+                    "vendor_name": "Linux kernel"
+                }
+            ]
+        }
+    },
+    "credit": [
+        {
+            "lang": "eng",
+            "value": "Manfred Paul"
+        },
+        {
+            "lang": "eng",
+            "value": "Anatoly Trosinenko"
+        }
+    ],
+    "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": "In the Linux kernel 5.5.0 and newer, the bpf verifier (kernel/bpf/verifier.c) did not properly restrict the register bounds for 32-bit operations, leading to out-of-bounds reads and writes in kernel memory. The vulnerability also affects the Linux 5.4 stable series, starting with v5.4.7, as the introducing commit was backported to that branch. (aka ZDI-CAN-10780)"
             }
         ]
-    }
-}
+    },
+    "generator": {
+        "engine": "Vulnogram 0.0.9"
+    },
+    "impact": {
+        "cvss": {
+            "attackComplexity": "HIGH",
+            "attackVector": "LOCAL",
+            "availabilityImpact": "HIGH",
+            "baseScore": 7.8,
+            "baseSeverity": "HIGH",
+            "confidentialityImpact": "HIGH",
+            "integrityImpact": "HIGH",
+            "privilegesRequired": "LOW",
+            "scope": "CHANGED",
+            "userInteraction": "NONE",
+            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
+            "version": "3.1"
+        }
+    },
+    "problemtype": {
+        "problemtype_data": [
+            {
+                "description": [
+                    {
+                        "lang": "eng",
+                        "value": "n/a"
+                    }
+                ]
+            }
+        ]
+    },
+    "references": {
+        "reference_data": [
+            {
+                "refsource": "CONFIRM",
+                "url": "https://www.thezdi.com/blog/2020/3/19/pwn2own-2020-day-one-results"
+            },
+            {
+                "refsource": "CONFIRM",
+                "url": "https://lore.kernel.org/bpf/20200330160324.15259-1-daniel@iogearbox.net/T/"
+            },
+            {
+                "refsource": "CONFIRM",
+                "url": "https://www.openwall.com/lists/oss-security/2020/03/30/3"
+            },
+            {
+                "refsource": "UBUNTU",
+                "url": "https://usn.ubuntu.com/usn/usn-4313-1"
+            },
+            {
+                "refsource": "CONFIRM",
+                "url": "https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fef"
+            }
+        ]
+    },
+    "solution": [
+        {
+            "lang": "eng",
+            "value": "Revert commit 581738a681b6 (\"bpf: Provide better register bounds after jmp32 instructions\")."
+        }
+    ],
+    "source": {
+        "discovery": "EXTERNAL"
+    },
+    "work_around": [
+        {
+            "lang": "eng",
+            "value": "Mitigation for this vulnerability is available by setting the kernel.unprivileged_bpf_disabled sysctl to 1:\n\n   $ sudo sysctl kernel.unprivileged_bpf_disabled=1\n   $ echo kernel.unprivileged_bpf_disabled=1 |  sudo tee /etc/sysctl.d/90-CVE-2020-8835.conf\n\nThis issue is also mitigated on systems that use secure boot with the kernel lockdown feature which blocks BPF program loading."
+        }
+    ]
+}