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CVE-2019-12760

Published: 6 June 2019

** 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."

Notes

AuthorNote
ccdm94
not considered a vulnerability by upstream, and no fix
available as of 2022-10-18. A documentation change was
made in order to warn users that the cache uses pickle
files (see commit 19de3eb) and a PR (#79) was opened to
replace pickle, but this was closed without any actual
changes being made.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
parso
Launchpad, Ubuntu, Debian
bionic Needs triage

cosmic Ignored
(end of life)
disco Ignored
(end of life)
eoan Not vulnerable
(0.5.1-0.1)
focal Not vulnerable
(0.5.1-0.1)
groovy Not vulnerable
(0.5.1-0.1)
hirsute Not vulnerable
(0.5.1-0.1)
impish Not vulnerable
(0.5.1-0.1)
jammy Not vulnerable
(0.5.1-0.1)
kinetic Not vulnerable
(0.5.1-0.1)
lunar Not vulnerable
(0.5.1-0.1)
mantic Not vulnerable
(0.5.1-0.1)
noble Not vulnerable
(0.5.1-0.1)
trusty Does not exist

upstream Needs triage

xenial Does not exist

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity High
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H