Vulnerabilities
Misconfiguration
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CVE Vulnerabilities

CVE-2017-18342

Deserialization of Untrusted Data

Published: Jun 27, 2018 | Modified: Nov 21, 2024
CVSS 3.x
9.8
CRITICAL
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
7.5 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P
RedHat/V2
RedHat/V3
8.1 MODERATE
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Ubuntu
LOW
Vulnerability-free packages from our partners
Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2017-18342
CWEhttps://cwe.mitre.org/data/definitions/502.html

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.

Weakness

The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

Affected Software

Name Vendor Start Version End Version
Pyyaml Pyyaml * 5.1 (excluding)
Pyyaml Ubuntu bionic *
Pyyaml Ubuntu cosmic *
Pyyaml Ubuntu disco *
Pyyaml Ubuntu esm-infra-legacy/trusty *
Pyyaml Ubuntu esm-infra/bionic *
Pyyaml Ubuntu esm-infra/xenial *
Pyyaml Ubuntu precise/esm *
Pyyaml Ubuntu trusty *
Pyyaml Ubuntu trusty/esm *
Pyyaml Ubuntu upstream *
Pyyaml Ubuntu xenial *

Potential Mitigations

  • Make fields transient to protect them from deserialization.
  • An attempt to serialize and then deserialize a class containing transient fields will result in NULLs where the transient data should be. This is an excellent way to prevent time, environment-based, or sensitive variables from being carried over and used improperly.

References

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