National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2018-14647 Detail

Current Description

Python's elementtree C accelerator failed to initialise Expat's hash salt during initialization. This could make it easy to conduct denial of service attacks against Expat by constructing an XML document that would cause pathological hash collisions in Expat's internal data structures, consuming large amounts CPU and RAM. Python 3.8, 3.7, 3.6, 3.5, 3.4, 2.7 are believed to be vulnerable.

Source:  MITRE
Description Last Modified:  09/25/2018
View Analysis Description

Impact

CVSS v3.0 Severity and Metrics:

Base Score: 7.5 HIGH
Vector: AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (V3 legend)
Impact Score: 3.6
Exploitability Score: 3.9


Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

CVSS v2.0 Severity and Metrics:

Base Score: 5.0 MEDIUM
Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P) (V2 legend)
Impact Subscore: 2.9
Exploitability Subscore: 10.0


Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (AU): None
Confidentiality (C): None
Integrity (I): None
Availability (A): Partial
Additional Information:
Allows disruption of service

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://www.securityfocus.com/bid/105396 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1041740 Third Party Advisory VDB Entry
https://bugs.python.org/issue34623 Issue Tracking Patch Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14647 Issue Tracking Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RBJCB2HWOJLP3L7CUQHJHNBHLSVOXJE5/ Third Party Advisory
https://usn.ubuntu.com/3817-1/ Third Party Advisory
https://usn.ubuntu.com/3817-2/ Third Party Advisory
https://www.debian.org/security/2018/dsa-4306 Third Party Advisory
https://www.debian.org/security/2018/dsa-4307 Third Party Advisory

Technical Details

Vulnerability Type (View All)

  • Resource Management Errors (CWE-399)

Known Affected Software Configurations Switch to CPE 2.2

Configuration 1 ( hide )
 cpe:2.3:a:python:python:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
2.7.0
Up to (including)
2.7.15
 cpe:2.3:a:python:python:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
3.4.0
Up to (including)
3.4.9
 cpe:2.3:a:python:python:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
3.5.0
Up to (including)
3.5.6
 cpe:2.3:a:python:python:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
3.6.0
Up to (excluding)
3.6.7
 cpe:2.3:a:python:python:3.7.0:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 2 ( hide )
 cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*
     Show Matching CPE(s)
 cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
     Show Matching CPE(s)
 cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
     Show Matching CPE(s)
 cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
     Show Matching CPE(s)

Configuration 3 ( hide )
 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 4 ( hide )
 cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
     Show Matching CPE(s)


Change History

10 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2018-14647
NVD Published Date:
09/24/2018
NVD Last Modified:
04/18/2019