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ubuntucveUbuntu.comUB:CVE-2017-18640
HistoryDec 12, 2019 - 12:00 a.m.

CVE-2017-18640

2019-12-1200:00:00
ubuntu.com
ubuntu.com
28

9.3 High

CVSS2

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:N/AC:M/Au:N/C:C/I:C/A:C

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

0.019 Low

EPSS

Percentile

88.5%

JSON

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

Notes

Author Note
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

Related

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9.3 High

CVSS2

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:N/AC:M/Au:N/C:C/I:C/A:C

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

0.019 Low

EPSS

Percentile

88.5%

JSON
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