CVE-2017-18342: Input Validation
First published: Wed Jun 27 2018(Updated: )
In PyYAML before 4.1, the `yaml.load()` API could execute arbitrary code. In other words, `yaml.safe_load` is not used.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| pip/pyyaml | <4.1 | 4.1 |
| redhat/PyYAML | <5.1 | 5.1 |
| Pyyaml Pyyaml | <5.1 | |
| Fedoraproject Fedora | =28 | |
| Fedoraproject Fedora | =29 | |
| Fedoraproject Fedora | =30 | |
| F5 BIG-IP | >=17.1.0<=17.1.1 | |
| F5 BIG-IP | >=16.1.0<=16.1.4 | |
| F5 BIG-IP | >=15.1.0<=15.1.10 | |
| F5 BIG-IQ Centralized Management | >=8.1.0<=8.3.0 |
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Reference Links
- https://nvd.nist.gov/vuln/detail/CVE-2017-18342
- https://github.com/marshmallow-code/apispec/issues/278
- https://github.com/yaml/pyyaml/issues/193
- https://github.com/yaml/pyyaml/pull/74
- https://github.com/yaml/pyyaml/blob/master/CHANGES
- https://github.com/yaml/pyyaml/wiki/PyYAML-yaml.load(input)-Deprecation
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JEX7IPV5P2QJITAMA5Z63GQCZA5I6NVZ/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KSQQMRUQSXBSUXLCRD3TSZYQ7SEZRKCE/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/M6JCFGEIEOFMWWIXGHSELMKQDD4CV2BA/
- https://security.gentoo.org/glsa/202003-45
- https://github.com/yaml/pyyaml/commit/7b68405c81db889f83c32846462b238ccae5be80
- https://github.com/advisories/GHSA-rprw-h62v-c2w7 (Advisory)
- https://www.cve.org/CVERecord?id=CVE-2017-18342 https://nvd.nist.gov/vuln/detail/CVE-2017-18342
- https://bugzilla.redhat.com/show_bug.cgi?id=1595743
- https://access.redhat.com/security/cve/CVE-2017-18342
- http://seclists.org/oss-sec/2018/q2/240
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1595744
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1595745
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1595746
- https://github.com/yaml/pyyaml/issues/187
- https://github.com/yaml/pyyaml/issues/192
- https://pyyaml.org/wiki/PyYAMLDocumentation#loading-yaml
- https://nedbatchelder.com/blog/201302/war_is_peace.html
- https://mail.python.org/pipermail/python-list/2019-March/739937.html
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1595743#c14
- https://my.f5.com/manage/s/article/K000139901
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M6JCFGEIEOFMWWIXGHSELMKQDD4CV2BA/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KSQQMRUQSXBSUXLCRD3TSZYQ7SEZRKCE/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JEX7IPV5P2QJITAMA5Z63GQCZA5I6NVZ/
- https://github.com/yaml/pyyaml/wiki/PyYAML-yaml.load%28input%29-Deprecation
- https://github.com/pypa/advisory-database/tree/main/vulns/pyyaml/PYSEC-2018-49.yaml
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JEX7IPV5P2QJITAMA5Z63GQCZA5I6NVZ
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KSQQMRUQSXBSUXLCRD3TSZYQ7SEZRKCE
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/M6JCFGEIEOFMWWIXGHSELMKQDD4CV2BA
Frequently Asked Questions
What is CVE-2017-18342?
CVE-2017-18342 is a vulnerability in PyYAML that allows arbitrary code execution.
How severe is CVE-2017-18342?
CVE-2017-18342 has a severity rating of 9.8, which is considered critical.
Which versions of PyYAML are affected by CVE-2017-18342?
Versions up to and including 4.1 of PyYAML are affected by CVE-2017-18342.
How can I fix CVE-2017-18342?
To fix CVE-2017-18342, you should upgrade to version 5.1 or newer of PyYAML.
Where can I find more information about CVE-2017-18342?
You can find more information about CVE-2017-18342 at the following references: [link1], [link2], [link3].
- collector/redhat-cve
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- alias/CVE-2017-18342
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