CVE-2017-18342

In PyYAML before 5.1, the yaml.load() API could execute arbitrary code if used with untrusted data. The load() function has been deprecated in version 5.1 and the 'UnsafeLoader' has been introduced for backward compatibility with the function.

CVSS v3.0 9.8 CRITICAL
CVSS v2.0 7.5 HIGH

9.8^/10

CVSS v3.0 : CRITICAL

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

7.5^/10

CVSS v2.0 : HIGH

V2 Legend

Vector : AV:N/AC:L/Au:N/C:P/I:P/A:P

Exploitability : 10.0 / Impact : 6.4

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
https://github.com/yaml/pyyaml/pull/74	Patch Third Party Advisory
https://github.com/yaml/pyyaml/blob/master/CHANGES	Release Notes Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/M6JCFGEIEOFMWWIXGHSELMKQDD4CV2BA/	Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KSQQMRUQSXBSUXLCRD3TSZYQ7SEZRKCE/	Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JEX7IPV5P2QJITAMA5Z63GQCZA5I6NVZ/	Third Party Advisory
https://github.com/yaml/pyyaml/wiki/PyYAML-yaml.load(input)-Deprecation	Third Party Advisory
https://github.com/marshmallow-code/apispec/issues/278	Third Party Advisory
https://github.com/yaml/pyyaml/issues/193	Third Party Advisory
https://security.gentoo.org/glsa/202003-45	Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:pyyaml:pyyaml:*:*:*:*:*:*:*:*

Configuration 2 (hide)

OR	cpe:2.3:o:fedoraproject:fedora:28:::::::*
	cpe:2.3:o:fedoraproject:fedora:29:::::::*
	cpe:2.3:o:fedoraproject:fedora:30:::::::*

Information

Published : 2018-06-27 05:29

Updated : 2020-10-14 06:23

NVD link : CVE-2017-18342

Mitre link : CVE-2017-18342

JSON object : View

CWE

CWE-502

Deserialization of Untrusted Data

Products Affected

pyyaml

pyyaml

fedoraproject

fedora

{"cve": {"data_type": "CVE", "references": {"reference_data": [{"url": "https://github.com/yaml/pyyaml/pull/74", "name": "https://github.com/yaml/pyyaml/pull/74", "tags": ["Patch", "Third Party Advisory"], "refsource": "MISC"}, {"url": "https://github.com/yaml/pyyaml/blob/master/CHANGES", "name": "https://github.com/yaml/pyyaml/blob/master/CHANGES", "tags": ["Release Notes", "Third Party Advisory"], "refsource": "MISC"}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/M6JCFGEIEOFMWWIXGHSELMKQDD4CV2BA/", "name": "FEDORA-2019-bed9afe622", "tags": ["Third Party Advisory"], "refsource": "FEDORA"}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KSQQMRUQSXBSUXLCRD3TSZYQ7SEZRKCE/", "name": "FEDORA-2019-779a9db46a", "tags": ["Third Party Advisory"], "refsource": "FEDORA"}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JEX7IPV5P2QJITAMA5Z63GQCZA5I6NVZ/", "name": "FEDORA-2019-44643e8bcb", "tags": ["Third Party Advisory"], "refsource": "FEDORA"}, {"url": "https://github.com/yaml/pyyaml/wiki/PyYAML-yaml.load(input)-Deprecation", "name": "https://github.com/yaml/pyyaml/wiki/PyYAML-yaml.load(input)-Deprecation", "tags": ["Third Party Advisory"], "refsource": "MISC"}, {"url": "https://github.com/marshmallow-code/apispec/issues/278", "name": "https://github.com/marshmallow-code/apispec/issues/278", "tags": ["Third Party Advisory"], "refsource": "MISC"}, {"url": "https://github.com/yaml/pyyaml/issues/193", "name": "https://github.com/yaml/pyyaml/issues/193", "tags": ["Third Party Advisory"], "refsource": "MISC"}, {"url": "https://security.gentoo.org/glsa/202003-45", "name": "GLSA-202003-45", "tags": ["Third Party Advisory"], "refsource": "GENTOO"}]}, "data_format": "MITRE", "description": {"description_data": [{"lang": "en", "value": "In PyYAML before 5.1, the yaml.load() API could execute arbitrary code if used with untrusted data. The load() function has been deprecated in version 5.1 and the 'UnsafeLoader' has been introduced for backward compatibility with the function."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "en", "value": "CWE-502"}]}]}, "data_version": "4.0", "CVE_data_meta": {"ID": "CVE-2017-18342", "ASSIGNER": "cve@mitre.org"}}, "impact": {"baseMetricV2": {"cvssV2": {"version": "2.0", "baseScore": 7.5, "accessVector": "NETWORK", "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P", "authentication": "NONE", "integrityImpact": "PARTIAL", "accessComplexity": "LOW", "availabilityImpact": "PARTIAL", "confidentialityImpact": "PARTIAL"}, "severity": "HIGH", "acInsufInfo": true, "impactScore": 6.4, "obtainAllPrivilege": false, "exploitabilityScore": 10.0, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}, "baseMetricV3": {"cvssV3": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}}, "publishedDate": "2018-06-27T12:29Z", "configurations": {"nodes": [{"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:a:pyyaml:pyyaml:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndExcluding": "5.1"}]}, {"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:o:fedoraproject:fedora:28:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}]}], "CVE_data_version": "4.0"}, "lastModifiedDate": "2020-10-14T13:23Z"}

9.8 /10