National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2018-20843 Detail

Current Description

In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks).

Source:  MITRE
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 (V3.0 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: 7.8 HIGH
Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:C) (V2 legend)
Impact Subscore: 6.9
Exploitability Subscore: 10.0


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

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.html
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226 Vendor Advisory
https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes Release Notes Third Party Advisory
https://github.com/libexpat/libexpat/issues/186 Issue Tracking Third Party Advisory
https://github.com/libexpat/libexpat/pull/262 Exploit Third Party Advisory
https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6 Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/06/msg00028.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CEJJSQSG3KSUQY4FPVHZ7ZTT7FORMFVD/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IDAUGEB3TUP6NEKJDBUBZX7N5OAUOOOK/
https://seclists.org/bugtraq/2019/Jun/39
https://security.netapp.com/advisory/ntap-20190703-0001/
https://support.f5.com/csp/article/K51011533
https://usn.ubuntu.com/4040-1/
https://usn.ubuntu.com/4040-2/
https://www.debian.org/security/2019/dsa-4472

Technical Details

Vulnerability Type (View All)

  • Improper Restriction of XML External Entity Reference (CWE-611)

Known Affected Software Configurations Switch to CPE 2.3

Configuration 1 ( hide )
 cpe:/a:libexpat:expat
     Show Matching CPE(s)
Up to (excluding)
2.2.7


Change History

10 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2018-20843
NVD Published Date:
06/24/2019
NVD Last Modified:
06/26/2019