Vulnerability Monitor

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CVE-2018-20843

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).

Published

2019-06-24T17:15:09.980

Last Modified

2025-05-30T20:15:20.570

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.5 (HIGH)

CVSSv2 Vector

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

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: COMPLETE

Exploitability Score

10.0

Impact Score

6.9

Weaknesses

Type: Primary
CWE-611
Type: Secondary
CWE-611

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	libexpat_project	libexpat	< 2.2.7	Yes
Operating System	canonical	ubuntu_linux	12.04	Yes
Operating System	canonical	ubuntu_linux	14.04	Yes
Operating System	canonical	ubuntu_linux	16.04	Yes
Operating System	canonical	ubuntu_linux	18.04	Yes
Operating System	canonical	ubuntu_linux	18.10	Yes
Operating System	canonical	ubuntu_linux	19.04	Yes
Operating System	debian	debian_linux	8.0	Yes
Operating System	debian	debian_linux	9.0	Yes
Operating System	fedoraproject	fedora	29	Yes
Operating System	fedoraproject	fedora	30	Yes
Operating System	opensuse	leap	15.0	Yes
Operating System	opensuse	leap	15.1	Yes
Application	oracle	hospitality_res_3700	≤ 5.7.6	Yes
Application	oracle	http_server	12.1.3.0	Yes
Application	oracle	http_server	12.2.1.4.0	Yes
Application	oracle	outside_in_technology	8.5.4	Yes
Application	oracle	outside_in_technology	8.5.5	Yes
Application	tenable	nessus	< 8.15.0	Yes

References

http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.html Mailing List, Third Party Advisory ([email protected])
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226 Issue Tracking, Third Party Advisory ([email protected])
https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes Release Notes, Third Party Advisory ([email protected])
https://github.com/libexpat/libexpat/issues/186 Issue Tracking, Patch, Third Party Advisory ([email protected])
https://github.com/libexpat/libexpat/pull/262 Exploit, Patch, Third Party Advisory ([email protected])
https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6 Patch, Third Party Advisory ([email protected])
https://lists.debian.org/debian-lts-announce/2019/06/msg00028.html Mailing List, Third Party Advisory ([email protected])
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CEJJSQSG3KSUQY4FPVHZ7ZTT7FORMFVD/ ([email protected])
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IDAUGEB3TUP6NEKJDBUBZX7N5OAUOOOK/ ([email protected])
https://seclists.org/bugtraq/2019/Jun/39 Mailing List, Third Party Advisory ([email protected])
https://security.gentoo.org/glsa/201911-08 Third Party Advisory ([email protected])
https://security.netapp.com/advisory/ntap-20190703-0001/ Third Party Advisory ([email protected])
https://support.f5.com/csp/article/K51011533 Third Party Advisory ([email protected])
https://usn.ubuntu.com/4040-1/ Third Party Advisory ([email protected])
https://usn.ubuntu.com/4040-2/ Third Party Advisory ([email protected])
https://www.debian.org/security/2019/dsa-4472 Third Party Advisory ([email protected])
https://www.oracle.com/security-alerts/cpuApr2021.html Patch, Third Party Advisory ([email protected])
https://www.oracle.com/security-alerts/cpuapr2020.html Patch, Third Party Advisory ([email protected])
https://www.oracle.com/security-alerts/cpuoct2020.html Patch, Third Party Advisory ([email protected])
https://www.oracle.com/security-alerts/cpuoct2021.html Patch, Third Party Advisory ([email protected])
https://www.tenable.com/security/tns-2021-11 Third Party Advisory ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.html Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226 Issue Tracking, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes Release Notes, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/libexpat/libexpat/issues/186 Issue Tracking, Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/libexpat/libexpat/pull/262 Exploit, Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6 Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.debian.org/debian-lts-announce/2019/06/msg00028.html Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CEJJSQSG3KSUQY4FPVHZ7ZTT7FORMFVD/ (af854a3a-2127-422b-91ae-364da2661108)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IDAUGEB3TUP6NEKJDBUBZX7N5OAUOOOK/ (af854a3a-2127-422b-91ae-364da2661108)
https://seclists.org/bugtraq/2019/Jun/39 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://security.gentoo.org/glsa/201911-08 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://security.netapp.com/advisory/ntap-20190703-0001/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://support.f5.com/csp/article/K51011533 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://usn.ubuntu.com/4040-1/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://usn.ubuntu.com/4040-2/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.debian.org/security/2019/dsa-4472 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.oracle.com/security-alerts/cpuApr2021.html Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.oracle.com/security-alerts/cpuapr2020.html Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.oracle.com/security-alerts/cpuoct2020.html Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.oracle.com/security-alerts/cpuoct2021.html Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.tenable.com/security/tns-2021-11 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)