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CVE-2017-18640

Published: 12 December 2019

The Alias feature in SnakeYAML before 1.26 allows entity expansion during a load operation, a related issue to CVE-2003-1564.

Notes

AuthorNote
alexmurray
Upstream dispute this as a valid CVE - https://bitbucket.org/asomov/snakeyaml/issues/377/allow-configuration-for-preventing-billion#comment-55227358 - and they added a test-case for this type of attack of 2 years ago https://bitbucket.org/asomov/snakeyaml/commits/04378d05777d21d114a9cdc24976ad49c8919222 so this would appear to be a non-issue

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

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

disco Ignored
(end of life)
eoan Ignored
(end of life)
focal Needs triage

trusty Needs triage

upstream Needs triage

groovy Ignored
(end of life)
hirsute Ignored
(end of life)
jammy Needs triage

xenial Needs triage

impish Ignored
(end of life)
kinetic Ignored
(end of life, was needs-triage)
mantic Needs triage

lunar Ignored
(end of life, was needs-triage)

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H