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Deserialization vulnerability exists in parso

High severity GitHub Reviewed Published Jun 13, 2019 to the GitHub Advisory Database • Updated Apr 22, 2024
Withdrawn This advisory was withdrawn on Jul 3, 2019

Package

pip parso (pip)

Affected versions

<= 0.4.0

Patched versions

None

Description

** DISPUTED ** A deserialization vulnerability exists in the way parso through 0.4.0 handles grammar parsing from the cache. Cache loading relies on pickle and, provided that an evil pickle can be written to a cache grammar file and that its parsing can be triggered, this flaw leads to Arbitrary Code Execution. NOTE: This is disputed because "the cache directory is not under control of the attacker in any common configuration."

References

Published by the National Vulnerability Database Jun 6, 2019
Reviewed Jun 13, 2019
Published to the GitHub Advisory Database Jun 13, 2019
Withdrawn Jul 3, 2019
Last updated Apr 22, 2024

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS score

0.131%
(49th percentile)

Weaknesses

CVE ID

CVE-2019-12760

GHSA ID

GHSA-22mf-97vh-x8rw

Source code

No known source code
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