9.8
CRITICAL
CVE-2017-18342
PyYAML Arbitrary Code Execution Vulnerability
Description

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.

INFO

Published Date :

June 27, 2018, 12:29 p.m.

Last Modified :

Nov. 7, 2023, 2:41 a.m.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

5.9

Exploitability Score :

3.9
Public PoC/Exploit Available at Github

CVE-2017-18342 has a 9 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2017-18342 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Fedoraproject fedora
1 Pyyaml pyyaml
: Total Affected Vendor : 2 | Products : 2
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2017-18342.

URL Resource
https://github.com/marshmallow-code/apispec/issues/278 Third Party Advisory
https://github.com/yaml/pyyaml/blob/master/CHANGES Release Notes Third Party Advisory
https://github.com/yaml/pyyaml/issues/193 Third Party Advisory
https://github.com/yaml/pyyaml/pull/74 Patch Third Party Advisory
https://github.com/yaml/pyyaml/wiki/PyYAML-yaml.load%28input%29-Deprecation
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JEX7IPV5P2QJITAMA5Z63GQCZA5I6NVZ/
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/M6JCFGEIEOFMWWIXGHSELMKQDD4CV2BA/
https://security.gentoo.org/glsa/202003-45 Third Party Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Profile Photo
ekufta0530/Interfile-Only-Semgrep

Semgrep rules filtered just to those with interfile. Updated as of last commit date

Updated: 4 months ago
0 stars 0 fork 0 watcher
Born at : July 19, 2024, 6:18 p.m. This repo has been linked 1 different CVEs too.
Profile Photo
GoranP/dvpwa

None

Shell Python JavaScript Jinja

Updated: 2 years, 4 months ago
0 stars 0 fork 0 watcher
Born at : June 23, 2022, 8:19 a.m. This repo has been linked 3 different CVEs too.
Profile Photo
qyl2021/simiki

None

Makefile Shell Python Dockerfile HTML CSS

Updated: 3 years, 5 months ago
0 stars 0 fork 0 watcher
Born at : June 17, 2021, 3:08 a.m. This repo has been linked 2 different CVEs too.
Profile Photo
glenjarvis/talk-yaml-json-xml-oh-my

Beginners technical talk with examples on the different data types for cross language/platform communication

Python

Updated: 3 years, 6 months ago
3 stars 0 fork 0 watcher
Born at : April 21, 2021, 12:38 a.m. This repo has been linked 1 different CVEs too.
Profile Photo
lvdh/distributed-locustio-on-aws

Distributed HTTP load testing platform on AWS, based on https://locust.io/.

Makefile Ruby Python

Updated: 4 years, 10 months ago
0 stars 2 fork 2 watcher
Born at : Aug. 28, 2019, 1:03 p.m. This repo has been linked 1 different CVEs too.
Profile Photo
danielhoherd/pre-commit-hooks

A collection of pre-commit hooks I use in most of my repositories.

pre-commit

Shell Python

Updated: 2 years, 10 months ago
1 stars 1 fork 1 watcher
Born at : March 20, 2019, 8:59 p.m. This repo has been linked 1 different CVEs too.
Profile Photo
PayTrace/intercom_test

intercom_test

Python

Updated: 5 years, 8 months ago
1 stars 1 fork 1 watcher
Born at : Oct. 19, 2018, 9:24 p.m. This repo has been linked 1 different CVEs too.
Profile Photo
markosamuli/deployment-server

GRPC deployment server sandbox project

Python Shell

Updated: 1 year, 9 months ago
0 stars 1 fork 1 watcher
Born at : May 29, 2016, 2:03 p.m. This repo has been linked 1 different CVEs too.
Profile Photo
tankywoo/simiki

Simiki is a simple wiki framework, written in Python.

wiki python static-site-generator lightweight tool

Shell Python HTML Makefile CSS Dockerfile

Updated: 3 months, 3 weeks ago
1148 stars 153 fork 153 watcher
Born at : Oct. 12, 2013, 2:10 a.m. This repo has been linked 2 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2017-18342 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2017-18342 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Nov. 07, 2023

    Action Type Old Value New Value
    Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M6JCFGEIEOFMWWIXGHSELMKQDD4CV2BA/ [No types assigned]
    Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KSQQMRUQSXBSUXLCRD3TSZYQ7SEZRKCE/ [No types assigned]
    Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JEX7IPV5P2QJITAMA5Z63GQCZA5I6NVZ/ [No types assigned]
    Added Reference MITRE https://github.com/yaml/pyyaml/wiki/PyYAML-yaml.load%28input%29-Deprecation [No types assigned]
    Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/M6JCFGEIEOFMWWIXGHSELMKQDD4CV2BA/
    Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/KSQQMRUQSXBSUXLCRD3TSZYQ7SEZRKCE/
    Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/JEX7IPV5P2QJITAMA5Z63GQCZA5I6NVZ/
    Removed Reference MITRE https://github.com/yaml/pyyaml/wiki/PyYAML-yaml.load(input)-Deprecation
  • Modified Analysis by [email protected]

    Oct. 14, 2020

    Action Type Old Value New Value
    Removed CVSS V3 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Changed Reference Type https://github.com/marshmallow-code/apispec/issues/278 No Types Assigned https://github.com/marshmallow-code/apispec/issues/278 Third Party Advisory
    Changed Reference Type https://github.com/yaml/pyyaml/issues/193 No Types Assigned https://github.com/yaml/pyyaml/issues/193 Third Party Advisory
    Changed Reference Type https://github.com/yaml/pyyaml/pull/74 Third Party Advisory https://github.com/yaml/pyyaml/pull/74 Patch, Third Party Advisory
    Changed Reference Type https://github.com/yaml/pyyaml/wiki/PyYAML-yaml.load(input)-Deprecation No Types Assigned https://github.com/yaml/pyyaml/wiki/PyYAML-yaml.load(input)-Deprecation Third Party Advisory
    Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/JEX7IPV5P2QJITAMA5Z63GQCZA5I6NVZ/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/JEX7IPV5P2QJITAMA5Z63GQCZA5I6NVZ/ Third Party Advisory
    Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/KSQQMRUQSXBSUXLCRD3TSZYQ7SEZRKCE/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/KSQQMRUQSXBSUXLCRD3TSZYQ7SEZRKCE/ Third Party Advisory
    Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/M6JCFGEIEOFMWWIXGHSELMKQDD4CV2BA/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/M6JCFGEIEOFMWWIXGHSELMKQDD4CV2BA/ Third Party Advisory
    Changed Reference Type https://security.gentoo.org/glsa/202003-45 No Types Assigned https://security.gentoo.org/glsa/202003-45 Third Party Advisory
    Removed CWE NIST CWE-20
    Added CWE NIST CWE-502
    Changed CPE Configuration OR *cpe:2.3:a:pyyaml:pyyaml:*:*:*:*:*:*:*:* OR *cpe:2.3:a:pyyaml:pyyaml:*:*:*:*:*:*:*:* versions up to (excluding) 5.1
    Added CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:28:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
  • CPE Deprecation Remap by [email protected]

    May. 28, 2020

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:a:pyyaml_project:pyyaml:*:*:*:*:*:*:*:* OR *cpe:2.3:a:pyyaml:pyyaml:*:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Mar. 19, 2020

    Action Type Old Value New Value
    Added Reference https://security.gentoo.org/glsa/202003-45 [No Types Assigned]
  • CVE Modified by [email protected]

    Jun. 24, 2019

    Action Type Old Value New Value
    Changed Description In PyYAML before 4.1, the yaml.load() API could execute arbitrary code. In other words, yaml.safe_load is not used. 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.
    Added Reference https://github.com/yaml/pyyaml/wiki/PyYAML-yaml.load(input)-Deprecation [No Types Assigned]
    Added Reference https://github.com/marshmallow-code/apispec/issues/278 [No Types Assigned]
    Added Reference https://github.com/yaml/pyyaml/issues/193 [No Types Assigned]
  • CVE Modified by [email protected]

    Mar. 30, 2019

    Action Type Old Value New Value
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/JEX7IPV5P2QJITAMA5Z63GQCZA5I6NVZ/ [No Types Assigned]
  • CVE Modified by [email protected]

    Mar. 23, 2019

    Action Type Old Value New Value
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/KSQQMRUQSXBSUXLCRD3TSZYQ7SEZRKCE/ [No Types Assigned]
  • CVE Modified by [email protected]

    Mar. 21, 2019

    Action Type Old Value New Value
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/M6JCFGEIEOFMWWIXGHSELMKQDD4CV2BA/ [No Types Assigned]
  • Reanalysis by [email protected]

    Jan. 17, 2019

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:a:pyyaml_project:pyyaml:*:*:*:*:*:*:*:* versions up to (excluding) 4.1 OR *cpe:2.3:a:pyyaml_project:pyyaml:*:*:*:*:*:*:*:*
  • Initial Analysis by [email protected]

    Aug. 21, 2018

    Action Type Old Value New Value
    Added CVSS V2 (AV:N/AC:L/Au:N/C:P/I:P/A:P)
    Added CVSS V3 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Changed Reference Type https://github.com/yaml/pyyaml/blob/master/CHANGES No Types Assigned https://github.com/yaml/pyyaml/blob/master/CHANGES Release Notes, Third Party Advisory
    Changed Reference Type https://github.com/yaml/pyyaml/pull/74 No Types Assigned https://github.com/yaml/pyyaml/pull/74 Third Party Advisory
    Added CWE CWE-20
    Added CPE Configuration OR *cpe:2.3:a:pyyaml_project:pyyaml:*:*:*:*:*:*:*:* versions up to (excluding) 4.1
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2017-18342 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2017-18342 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

1.42 }} -0.02%

score

0.86528

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
: