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High severity · published Jun 24, 2019
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…
7.5
CVSS
7.1%
EPSS
No
On KEV
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).
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)7.1% · higher than 94% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DL
Debian Linux · Debian
8.0; 9.0 · source: NVD
FE
Fedora · Fedoraproject
29; 30 · source: NVD
HR
Hospitality Res 3700 · Oracle
5.7 through 5.7.6 · source: NVD
HS
Http Server · Oracle
12.1.3.0; 12.2.1.4.0 · source: NVD
LE
Leap · Opensuse
15.0; 15.1 · source: NVD
LI
Libexpat · Libexpat Project
before 2.2.7 · source: NVD
NE
Nessus · Tenable
before 8.15.0 · source: NVD
OI
Outside IN Technology · Oracle
8.5.4; 8.5.5 · source: NVD
UL
Ubuntu Linux · Canonical
12.04; 14.04; 16.04; 18.04; 18.10; 19.04 · source: NVD
SS
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP · Siemens
V3.1.0 before V3.1.5; V3.1.0 before V3.1.5 · source: CISA
SS
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP · Siemens
V3.1.0 before V3.1.5; V3.1.0 before V3.1.5 · source: CISA
SS
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP · Siemens
V3.1.0 before V3.1.5 · source: CISA
Affected product
UL
Ubuntu Linux
Canonical
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-20843
CVE.org
https://www.cve.org/CVERecord?id=CVE-2018-20843
Mailing List
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.html
Issue Tracking
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226
Release Notes
https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes
Issue Tracking
https://github.com/libexpat/libexpat/issues/186
Exploit
https://github.com/libexpat/libexpat/pull/262
Patch
https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6
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