CVE-2018-20843: XEE
First published: Mon Jun 24 2019(Updated: )
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).
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/jbcs-httpd24-curl | <0:7.64.1-36.jbcs.el6 | 0:7.64.1-36.jbcs.el6 |
| redhat/jbcs-httpd24-httpd | <0:2.4.37-57.jbcs.el6 | 0:2.4.37-57.jbcs.el6 |
| redhat/jbcs-httpd24-nghttp2 | <0:1.39.2-25.jbcs.el6 | 0:1.39.2-25.jbcs.el6 |
| redhat/jbcs-httpd24-curl | <0:7.64.1-36.jbcs.el7 | 0:7.64.1-36.jbcs.el7 |
| redhat/jbcs-httpd24-httpd | <0:2.4.37-57.jbcs.el7 | 0:2.4.37-57.jbcs.el7 |
| redhat/jbcs-httpd24-nghttp2 | <0:1.39.2-25.jbcs.el7 | 0:1.39.2-25.jbcs.el7 |
| redhat/jbcs-httpd24-openssl-pkcs11 | <0:0.4.10-7.jbcs.el7 | 0:0.4.10-7.jbcs.el7 |
| redhat/expat | <0:2.1.0-12.el7 | 0:2.1.0-12.el7 |
| redhat/mingw-expat | <0:2.2.4-5.el8 | 0:2.2.4-5.el8 |
| redhat/expat | <0:2.2.5-4.el8 | 0:2.2.5-4.el8 |
| debian/expat | <=2.2.6-1<=2.2.0-2+deb9u1<=2.2.0-1 | 2.2.6-2 2.2.0-2+deb9u2 |
| redhat/expat | <2.2.7 | 2.2.7 |
| debian/expat | 2.2.10-2+deb11u5 2.2.10-2+deb11u6 2.5.0-1+deb12u1 2.6.4-1 | |
| Debian (libexpat1) | <2.2.7 | |
| Ubuntu | =12.04 | |
| Ubuntu | =14.04 | |
| Ubuntu | =16.04 | |
| Ubuntu | =18.04 | |
| Ubuntu | =18.10 | |
| Ubuntu | =19.04 | |
| Debian | =8.0 | |
| Debian | =9.0 | |
| Fedora | =29 | |
| Fedora | =30 | |
| openSUSE | =15.0 | |
| openSUSE | =15.1 | |
| Oracle Hospitality RES 3700 | >=5.7<=5.7.6 | |
| Oracle HTTP Server | =12.1.3.0 | |
| Oracle HTTP Server | =12.2.1.4.0 | |
| Oracle Outside In Technology | =8.5.4 | |
| Oracle Outside In Technology | =8.5.5 | |
| Tenable Nessus | <8.15.0 | |
| IBM Rational DOORS Next Generation | <=6.0.2 | |
| IBM Rational DOORS Next Generation | <=6.0.6.1 | |
| IBM Rational DOORS Next Generation | <=6.0.6 | |
| IBM Rational DOORS Next Generation | <=7.0 |
Remedy
https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2018-20843 https://nvd.nist.gov/vuln/detail/CVE-2018-20843 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=931031
- https://bugzilla.redhat.com/show_bug.cgi?id=1723723
- https://access.redhat.com/errata/RHSA-2020:2644
- https://access.redhat.com/errata/RHSA-2020:3952
- https://access.redhat.com/errata/RHSA-2020:4846
- https://access.redhat.com/errata/RHSA-2020:4484
- https://access.redhat.com/errata/RHSA-2020:2646
- https://access.redhat.com/security/cve/cve-2018-20843
- http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.html
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226
- https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes
- https://github.com/libexpat/libexpat/issues/186
- https://github.com/libexpat/libexpat/pull/262
- https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6
- 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.gentoo.org/glsa/201911-08
- 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
- https://www.oracle.com/security-alerts/cpuApr2021.html
- https://www.oracle.com/security-alerts/cpuapr2020.html
- https://www.oracle.com/security-alerts/cpuoct2020.html
- https://www.oracle.com/security-alerts/cpuoct2021.html
- https://www.tenable.com/security/tns-2021-11
- https://launchpad.net/bugs/cve/CVE-2018-20843
- https://security-tracker.debian.org/tracker/CVE-2018-20843
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20843
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=931031
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CEJJSQSG3KSUQY4FPVHZ7ZTT7FORMFVD/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IDAUGEB3TUP6NEKJDBUBZX7N5OAUOOOK/
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1723724
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1723726
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1723725
- https://access.redhat.com/support/policy/updates/jboss_notes
- https://github.com/libexpat/libexpat/commit/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6
- https://exchange.xforce.ibmcloud.com/vulnerabilities/163073
- https://www.ibm.com/support/pages/node/6235162 (Advisory)
- https://nvd.nist.gov/vuln/detail/CVE-2018-20843
- https://ubuntu.com/security/CVE-2018-20843
Parent vulnerabilities
(Appears in the following advisories)
Frequently Asked Questions
What is the severity of CVE-2018-20843?
CVE-2018-20843 has been classified as a high-severity vulnerability due to its potential to cause denial-of-service attacks by consuming excessive resources.
How do I fix CVE-2018-20843?
To fix CVE-2018-20843, update your libexpat version to 2.2.7 or later as recommended by your software provider.
What software is affected by CVE-2018-20843?
CVE-2018-20843 affects several versions of libexpat, particularly versions prior to 2.2.7, along with specific Red Hat packages like jbcs-httpd24-curl and jbcs-httpd24-httpd.
What are the symptoms of CVE-2018-20843 exploitation?
Exploitation of CVE-2018-20843 may result in the XML parser consuming high amounts of RAM and CPU resources, leading to performance degradation or application crashes.
Is CVE-2018-20843 present in my system?
To determine if CVE-2018-20843 is present in your system, check the version of the libexpat library and any affected software packages installed.
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