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Merge pull request #645 from Katee/include-cvssv3

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Switch to NVD JSON feed and include CVSSv3
This commit is contained in:
Jimmy Zelinskie 2018-10-22 13:03:42 -04:00 committed by GitHub
commit 0c2e5e73c2
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GPG Key ID: 4AEE18F83AFDEB23
6 changed files with 389 additions and 118 deletions
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163
ext/vulnmdsrc/nvd/json.go Normal file
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@ -0,0 +1,163 @@
// Copyright 2018 clair authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package nvd
import (
"fmt"
"strings"
log "github.com/sirupsen/logrus"
)
type nvd struct {
Entries []nvdEntry `json:"CVE_Items"`
}
type nvdEntry struct {
CVE nvdCVE `json:"cve"`
Impact nvdImpact `json:"impact"`
PublishedDateTime string `json:"publishedDate"`
}
type nvdCVE struct {
Metadata nvdCVEMetadata `json:"CVE_data_meta"`
}
type nvdCVEMetadata struct {
CVEID string `json:"ID"`
}
type nvdImpact struct {
BaseMetricV2 nvdBaseMetricV2 `json:"baseMetricV2"`
BaseMetricV3 nvdBaseMetricV3 `json:"baseMetricV3"`
}
type nvdBaseMetricV2 struct {
CVSSv2 nvdCVSSv2 `json:"cvssV2"`
}
type nvdCVSSv2 struct {
Score float64 `json:"baseScore"`
AccessVector string `json:"accessVector"`
AccessComplexity string `json:"accessComplexity"`
Authentication string `json:"authentication"`
ConfImpact string `json:"confidentialityImpact"`
IntegImpact string `json:"integrityImpact"`
AvailImpact string `json:"availabilityImpact"`
}
type nvdBaseMetricV3 struct {
CVSSv3 nvdCVSSv3 `json:"cvssV3"`
ExploitabilityScore float64 `json:"exploitabilityScore"`
ImpactScore float64 `json:"impactScore"`
}
type nvdCVSSv3 struct {
Score float64 `json:"baseScore"`
AttackVector string `json:"attackVector"`
AttackComplexity string `json:"attackComplexity"`
PrivilegesRequired string `json:"privilegesRequired"`
UserInteraction string `json:"userInteraction"`
Scope string `json:"scope"`
ConfImpact string `json:"confidentialityImpact"`
IntegImpact string `json:"integrityImpact"`
AvailImpact string `json:"availabilityImpact"`
}
var vectorValuesToLetters = map[string]string{
"NETWORK": "N",
"ADJACENT_NETWORK": "A",
"LOCAL": "L",
"HIGH": "H",
"MEDIUM": "M",
"LOW": "L",
"NONE": "N",
"SINGLE": "S",
"MULTIPLE": "M",
"PARTIAL": "P",
"COMPLETE": "C",
// CVSSv3 only
"PHYSICAL": "P",
"REQUIRED": "R",
"CHANGED": "C",
"UNCHANGED": "U",
}
func (n nvdEntry) Metadata() *NVDMetadata {
metadata := &NVDMetadata{
CVSSv2: NVDmetadataCVSSv2{
PublishedDateTime: n.PublishedDateTime,
Vectors: n.Impact.BaseMetricV2.CVSSv2.String(),
Score: n.Impact.BaseMetricV2.CVSSv2.Score,
},
CVSSv3: NVDmetadataCVSSv3{
Vectors: n.Impact.BaseMetricV3.CVSSv3.String(),
Score: n.Impact.BaseMetricV3.CVSSv3.Score,
ExploitabilityScore: n.Impact.BaseMetricV3.ExploitabilityScore,
ImpactScore: n.Impact.BaseMetricV3.ImpactScore,
},
}
if metadata.CVSSv2.Vectors == "" {
return nil
}
return metadata
}
func (n nvdEntry) Name() string {
return n.CVE.Metadata.CVEID
}
func (n nvdCVSSv2) String() string {
var str string
addVec(&str, "AV", n.AccessVector)
addVec(&str, "AC", n.AccessComplexity)
addVec(&str, "Au", n.Authentication)
addVec(&str, "C", n.ConfImpact)
addVec(&str, "I", n.IntegImpact)
addVec(&str, "A", n.AvailImpact)
str = strings.TrimSuffix(str, "/")
return str
}
func (n nvdCVSSv3) String() string {
var str string
addVec(&str, "AV", n.AttackVector)
addVec(&str, "AC", n.AttackComplexity)
addVec(&str, "PR", n.PrivilegesRequired)
addVec(&str, "UI", n.UserInteraction)
addVec(&str, "S", n.Scope)
addVec(&str, "C", n.ConfImpact)
addVec(&str, "I", n.IntegImpact)
addVec(&str, "A", n.AvailImpact)
str = strings.TrimSuffix(str, "/")
if len(str) > 0 {
return fmt.Sprintf("CVSS:3.0/%s", str)
}
return str
}
func addVec(str *string, vec, val string) {
if val != "" {
if let, ok := vectorValuesToLetters[val]; ok {
*str = fmt.Sprintf("%s%s:%s/", *str, vec, let)
} else {
log.WithFields(log.Fields{"value": val, "vector": vec}).Warning("unknown value for CVSS vector")
}
}
}

40
ext/vulnmdsrc/nvd/nvd.go
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@ -19,7 +19,7 @@ package nvd
import (
"bufio"
"compress/gzip"
"encoding/xml"
"encoding/json"
"errors"
"fmt"
"io"
@ -39,8 +39,8 @@ import (
)
const (
dataFeedURL string = "https://nvd.nist.gov/feeds/xml/cve/2.0/nvdcve-2.0-%s.xml.gz"
dataFeedMetaURL string = "https://nvd.nist.gov/feeds/xml/cve/2.0/nvdcve-2.0-%s.meta"
dataFeedURL string = "https://nvd.nist.gov/feeds/json/cve/1.0/nvdcve-1.0-%s.json.gz"
dataFeedMetaURL string = "https://nvd.nist.gov/feeds/json/cve/1.0/nvdcve-1.0-%s.meta"
appenderName string = "NVD"
@ -55,6 +55,7 @@ type appender struct {
type NVDMetadata struct {
CVSSv2 NVDmetadataCVSSv2
CVSSv3 NVDmetadataCVSSv3
}
type NVDmetadataCVSSv2 struct {
@ -63,6 +64,13 @@ type NVDmetadataCVSSv2 struct {
Score float64
}
type NVDmetadataCVSSv3 struct {
Vectors string
Score float64
ExploitabilityScore float64
ImpactScore float64
}
func init() {
vulnmdsrc.RegisterAppender(appenderName, &appender{})
}
@ -95,23 +103,31 @@ func (a *appender) BuildCache(datastore database.Datastore) error {
log.WithError(err).WithField(logDataFeedName, dataFeedName).Error("could not open NVD data file")
return commonerr.ErrCouldNotParse
}
var nvd nvd
r := bufio.NewReader(f)
if err = xml.NewDecoder(r).Decode(&nvd); err != nil {
if err := a.parseDataFeed(r); err != nil {
log.WithError(err).WithField(logDataFeedName, dataFeedName).Error("could not parse NVD data file")
return err
}
f.Close()
log.WithError(err).WithField(logDataFeedName, dataFeedName).Error("could not decode NVD data feed")
}
return nil
}
func (a *appender) parseDataFeed(r io.Reader) error {
var nvd nvd
if err := json.NewDecoder(r).Decode(&nvd); err != nil {
return commonerr.ErrCouldNotParse
}
// For each entry of this data feed:
for _, nvdEntry := range nvd.Entries {
// Create metadata entry.
if metadata := nvdEntry.Metadata(); metadata != nil {
a.metadata[nvdEntry.Name] = *metadata
a.metadata[nvdEntry.Name()] = *metadata
}
}
f.Close()
}
return nil
}
@ -154,7 +170,8 @@ func getDataFeeds(dataFeedHashes map[string]string, localPath string) (map[strin
// Create map containing the name and filename for every data feed.
dataFeedReaders := make(map[string]string)
for _, dataFeedName := range dataFeedNames {
fileName := filepath.Join(localPath, fmt.Sprintf("%s.xml", dataFeedName))
fileName := filepath.Join(localPath, fmt.Sprintf("%s.json", dataFeedName))
if h, ok := dataFeedHashes[dataFeedName]; ok && h == dataFeedHashes[dataFeedName] {
// The hash is known, the disk should contains the feed. Try to read from it.
if localPath != "" {
@ -177,7 +194,6 @@ func getDataFeeds(dataFeedHashes map[string]string, localPath string) (map[strin
}
func downloadFeed(dataFeedName, fileName string) error {
// Download data feed.
r, err := httputil.GetWithUserAgent(fmt.Sprintf(dataFeedURL, dataFeedName))
if err != nil {

99
ext/vulnmdsrc/nvd/nvd_test.go Normal file
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@ -0,0 +1,99 @@
// Copyright 2018 clair authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package nvd
import (
"os"
"path/filepath"
"runtime"
"testing"
"github.com/stretchr/testify/assert"
)
func TestNVDParser(t *testing.T) {
_, filename, _, _ := runtime.Caller(0)
path := filepath.Join(filepath.Dir(filename))
dataFilePath := filepath.Join(path, "/testdata/nvd_test.json")
testData, err := os.Open(dataFilePath)
if err != nil {
t.Fatalf("Error opening %q: %v", dataFilePath, err)
}
defer testData.Close()
a := &appender{}
a.metadata = make(map[string]NVDMetadata)
err = a.parseDataFeed(testData)
if err != nil {
t.Fatalf("Error parsing %q: %v", dataFilePath, err)
}
var gotMetadata, wantMetadata NVDMetadata
// Items without CVSSv2 aren't returned.
assert.Len(t, a.metadata, 2)
gotMetadata, ok := a.metadata["CVE-2002-0001"]
assert.False(t, ok)
// Item with only CVSSv2.
gotMetadata, ok = a.metadata["CVE-2012-0001"]
assert.True(t, ok)
wantMetadata = NVDMetadata{
CVSSv2: NVDmetadataCVSSv2{
Vectors: "AV:N/AC:L/Au:S/C:P/I:N/A:N",
Score: 4.0,
},
}
assert.Equal(t, wantMetadata, gotMetadata)
// Item with both CVSSv2 and CVSSv3 has CVSSv2 information returned.
gotMetadata, ok = a.metadata["CVE-2018-0001"]
assert.True(t, ok)
wantMetadata = NVDMetadata{
CVSSv2: NVDmetadataCVSSv2{
Vectors: "AV:N/AC:L/Au:N/C:P/I:P/A:P",
Score: 7.5,
},
CVSSv3: NVDmetadataCVSSv3{
Vectors: "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
Score: 9.8,
ExploitabilityScore: 3.9,
ImpactScore: 5.9,
},
}
assert.Equal(t, wantMetadata, gotMetadata)
}
func TestNVDParserErrors(t *testing.T) {
_, filename, _, _ := runtime.Caller(0)
path := filepath.Join(filepath.Dir(filename))
dataFilePath := filepath.Join(path, "/testdata/nvd_test_incorrect_format.json")
testData, err := os.Open(dataFilePath)
if err != nil {
t.Fatalf("Error opening %q: %v", dataFilePath, err)
}
defer testData.Close()
a := &appender{}
a.metadata = make(map[string]NVDMetadata)
err = a.parseDataFeed(testData)
if err == nil {
t.Fatalf("Expected error parsing NVD data file: %q", dataFilePath)
}
}

92
ext/vulnmdsrc/nvd/testdata/nvd_test.json vendored Normal file
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@ -0,0 +1,92 @@
{
"CVE_Items" : [ {
"_comment": "A CVE without CVSSv2 or CVSSv3",
"cve" : {
"data_type" : "CVE",
"data_format" : "MITRE",
"data_version" : "4.0",
"CVE_data_meta" : {
"ID" : "CVE-2002-0001"
}
},
"impact" : { },
"publishedDate" : "2018-01-10T22:29Z"
}, {
"_comment": "A CVE with only CVSSv2",
"cve" : {
"CVE_data_meta" : {
"ID" : "CVE-2012-0001"
}
},
"impact" : {
"baseMetricV3" : { },
"baseMetricV2" : {
"cvssV2" : {
"version" : "2.0",
"vectorString" : "(AV:N/AC:L/Au:S/C:P/I:N/A:N)",
"accessVector" : "NETWORK",
"accessComplexity" : "LOW",
"authentication" : "SINGLE",
"confidentialityImpact" : "PARTIAL",
"integrityImpact" : "NONE",
"availabilityImpact" : "NONE",
"baseScore" : 4.0
},
"severity" : "MEDIUM",
"exploitabilityScore" : 8.0,
"impactScore" : 2.9,
"obtainAllPrivilege" : false,
"obtainUserPrivilege" : false,
"obtainOtherPrivilege" : false,
"userInteractionRequired" : false
}
}
}, {
"_comment": "A CVE with standard CVSSv2 and CVSSv3",
"cve" : {
"CVE_data_meta" : {
"ID" : "CVE-2018-0001"
}
},
"impact" : {
"baseMetricV3" : {
"cvssV3" : {
"version" : "3.0",
"vectorString" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"attackVector" : "NETWORK",
"attackComplexity" : "LOW",
"privilegesRequired" : "NONE",
"userInteraction" : "NONE",
"scope" : "UNCHANGED",
"confidentialityImpact" : "HIGH",
"integrityImpact" : "HIGH",
"availabilityImpact" : "HIGH",
"baseScore" : 9.8,
"baseSeverity" : "CRITICAL"
},
"exploitabilityScore" : 3.9,
"impactScore" : 5.9
},
"baseMetricV2" : {
"cvssV2" : {
"version" : "2.0",
"vectorString" : "(AV:N/AC:L/Au:N/C:P/I:P/A:P)",
"accessVector" : "NETWORK",
"accessComplexity" : "LOW",
"authentication" : "NONE",
"confidentialityImpact" : "PARTIAL",
"integrityImpact" : "PARTIAL",
"availabilityImpact" : "PARTIAL",
"baseScore" : 7.5
},
"severity" : "HIGH",
"exploitabilityScore" : 10.0,
"impactScore" : 6.4,
"obtainAllPrivilege" : false,
"obtainUserPrivilege" : false,
"obtainOtherPrivilege" : false,
"userInteractionRequired" : false
}
}
} ]
}

1
ext/vulnmdsrc/nvd/testdata/nvd_test_incorrect_format.json vendored Normal file
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@ -0,0 +1 @@
Not a JSON file.

100
ext/vulnmdsrc/nvd/xml.go
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@ -1,100 +0,0 @@
// Copyright 2017 clair authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package nvd
import (
"fmt"
"strings"
log "github.com/sirupsen/logrus"
)
type nvd struct {
Entries []nvdEntry `xml:"entry"`
}
type nvdEntry struct {
Name string `xml:"http://scap.nist.gov/schema/vulnerability/0.4 cve-id"`
CVSS nvdCVSS `xml:"http://scap.nist.gov/schema/vulnerability/0.4 cvss"`
PublishedDateTime string `xml:"http://scap.nist.gov/schema/vulnerability/0.4 published-datetime"`
}
type nvdCVSS struct {
BaseMetrics nvdCVSSBaseMetrics `xml:"http://scap.nist.gov/schema/cvss-v2/0.2 base_metrics"`
}
type nvdCVSSBaseMetrics struct {
Score float64 `xml:"score"`
AccessVector string `xml:"access-vector"`
AccessComplexity string `xml:"access-complexity"`
Authentication string `xml:"authentication"`
ConfImpact string `xml:"confidentiality-impact"`
IntegImpact string `xml:"integrity-impact"`
AvailImpact string `xml:"availability-impact"`
}
var vectorValuesToLetters map[string]string
func init() {
vectorValuesToLetters = make(map[string]string)
vectorValuesToLetters["NETWORK"] = "N"
vectorValuesToLetters["ADJACENT_NETWORK"] = "A"
vectorValuesToLetters["LOCAL"] = "L"
vectorValuesToLetters["HIGH"] = "H"
vectorValuesToLetters["MEDIUM"] = "M"
vectorValuesToLetters["LOW"] = "L"
vectorValuesToLetters["NONE"] = "N"
vectorValuesToLetters["SINGLE_INSTANCE"] = "S"
vectorValuesToLetters["MULTIPLE_INSTANCES"] = "M"
vectorValuesToLetters["PARTIAL"] = "P"
vectorValuesToLetters["COMPLETE"] = "C"
}
func (n nvdEntry) Metadata() *NVDMetadata {
metadata := &NVDMetadata{
CVSSv2: NVDmetadataCVSSv2{
PublishedDateTime: n.PublishedDateTime,
Vectors: n.CVSS.BaseMetrics.String(),
Score: n.CVSS.BaseMetrics.Score,
},
}
if metadata.CVSSv2.Vectors == "" {
return nil
}
return metadata
}
func (n nvdCVSSBaseMetrics) String() string {
var str string
addVec(&str, "AV", n.AccessVector)
addVec(&str, "AC", n.AccessComplexity)
addVec(&str, "Au", n.Authentication)
addVec(&str, "C", n.ConfImpact)
addVec(&str, "I", n.IntegImpact)
addVec(&str, "A", n.AvailImpact)
str = strings.TrimSuffix(str, "/")
return str
}
func addVec(str *string, vec, val string) {
if val != "" {
if let, ok := vectorValuesToLetters[val]; ok {
*str = fmt.Sprintf("%s%s:%s/", *str, vec, let)
} else {
log.WithFields(log.Fields{"value": val, "vector": vec}).Warning("unknown value for CVSSv2 vector")
}
}
}