IM
IronMonkey Threat Research

CVE-2018-20843 HIGH

Published: 2019-06-24 | Last Modified: 2026-06-17 | Status: Modified

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).

Additional Descriptions (1)

En libexpat en Expat anterior a versión 2.2.7, una entrada XML incluyendo nombres XML que contienen una gran cantidad de "dos puntos", podría hacer que el analizador XML consuma una gran cantidad de recursos de RAM y CPU durante el procesamiento (lo suficiente como para ser utilizables en ataques de denegación de servicio) .

CVSS Metrics

Base Score: 7.5 (HIGH)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack VectorNETWORK
Attack ComplexityLOW
Privileges RequiredNONE
User InteractionNONE
ScopeUNCHANGED
Confidentiality ImpactNONE
Integrity ImpactNONE
Availability ImpactHIGH

Source: [email protected]

Type: Primary

Exploitability Score: 3.9

Impact Score: 3.6

Base Score: 7.8 (HIGH)

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

Access VectorNETWORK
Access ComplexityLOW
AuthenticationNONE
Confidentiality ImpactNONE
Integrity ImpactNONE
Availability ImpactCOMPLETE

Source: [email protected]

Type: Primary

Exploitability Score: 10.0

Impact Score: 6.9

Weaknesses

Source Type Description
[email protected] Primary
en CWE-611
134c704f-9b21-4f2e-91b3-4a467353bcc0 Secondary
en CWE-611

Affected Products

Vendor Product Version Update Type
libexpat_project libexpat * <built-in method update of dict object at 0x7fd341540b80> Application
canonical ubuntu_linux 12.04 <built-in method update of dict object at 0x7fd386739500> Operating System
canonical ubuntu_linux 14.04 <built-in method update of dict object at 0x7fd341542ec0> Operating System
canonical ubuntu_linux 16.04 <built-in method update of dict object at 0x7fd341541b00> Operating System
canonical ubuntu_linux 18.04 <built-in method update of dict object at 0x7fd341541e40> Operating System
canonical ubuntu_linux 18.10 <built-in method update of dict object at 0x7fd341542280> Operating System
canonical ubuntu_linux 19.04 <built-in method update of dict object at 0x7fd369407d40> Operating System
debian debian_linux 8.0 <built-in method update of dict object at 0x7fd319dd49c0> Operating System
debian debian_linux 9.0 <built-in method update of dict object at 0x7fd341beae00> Operating System
fedoraproject fedora 29 <built-in method update of dict object at 0x7fd341541500> Operating System
fedoraproject fedora 30 <built-in method update of dict object at 0x7fd341540400> Operating System
opensuse leap 15.0 <built-in method update of dict object at 0x7fd341542b80> Operating System
opensuse leap 15.1 <built-in method update of dict object at 0x7fd341541f00> Operating System
oracle hospitality_res_3700 * <built-in method update of dict object at 0x7fd341be8280> Application
oracle http_server 12.1.3.0 <built-in method update of dict object at 0x7fd341be83c0> Application
oracle http_server 12.2.1.4.0 <built-in method update of dict object at 0x7fd341be9740> Application
oracle outside_in_technology 8.5.4 <built-in method update of dict object at 0x7fd341be8ec0> Application
oracle outside_in_technology 8.5.5 <built-in method update of dict object at 0x7fd341beb040> Application
tenable nessus * <built-in method update of dict object at 0x7fd34bce3540> Application

Affected Configurations

Operator: OR

Vulnerable CPE
Yes cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*

Operator: OR

Vulnerable CPE
Yes cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:-:*:*:*
Yes cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*
Yes cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
Yes cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
Yes cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*
Yes cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:*

Operator: OR

Vulnerable CPE
Yes cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
Yes cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

Operator: OR

Vulnerable CPE
Yes cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*
Yes cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*

Operator: OR

Vulnerable CPE
Yes cpe:2.3:o:opensuse:leap:15.0:*:*:*:*:*:*:*
Yes cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*

Operator: OR

Vulnerable CPE
Yes cpe:2.3:a:oracle:hospitality_res_3700:*:*:*:*:*:*:*:*
Yes cpe:2.3:a:oracle:http_server:12.1.3.0:*:*:*:*:*:*:*
Yes cpe:2.3:a:oracle:http_server:12.2.1.4.0:*:*:*:*:*:*:*
Yes cpe:2.3:a:oracle:outside_in_technology:8.5.4:*:*:*:*:*:*:*
Yes cpe:2.3:a:oracle:outside_in_technology:8.5.5:*:*:*:*:*:*:*

Operator: OR

Vulnerable CPE
Yes cpe:2.3:a:tenable:nessus:*:*:*:*:*:*:*:*

References