CVE-2018-20843

high

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).

References

https://www.tenable.com/security/tns-2021-11

https://www.oracle.com/security-alerts/cpuoct2021.html

https://www.oracle.com/security-alerts/cpuoct2020.html

https://www.oracle.com/security-alerts/cpuapr2020.html

https://www.oracle.com/security-alerts/cpuApr2021.html

https://www.debian.org/security/2019/dsa-4472

https://usn.ubuntu.com/4040-2/

https://usn.ubuntu.com/4040-1/

https://support.f5.com/csp/article/K51011533

https://security.netapp.com/advisory/ntap-20190703-0001/

https://security.gentoo.org/glsa/201911-08

https://seclists.org/bugtraq/2019/Jun/39

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IDAUGEB3TUP6NEKJDBUBZX7N5OAUOOOK/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CEJJSQSG3KSUQY4FPVHZ7ZTT7FORMFVD/

https://lists.debian.org/debian-lts-announce/2019/06/msg00028.html

https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6

https://github.com/libexpat/libexpat/issues/186

https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226

http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.html

https://www.tenable.com/blog/oracle-april-2021-critical-patch-update-addresses-257-cves-including-zerologon-cve-2020-1472

https://github.com/libexpat/libexpat/pull/262

Details

Source: Mitre, NVD

Published: 2019-06-24

Updated: 2023-11-07

Risk Information

CVSS v2

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

Severity: High

CVSS v3

Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H