CVE-2018-20843
expat: large number of colons in input makes parser consume high amount of resources, leading to DoS
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
1Exploited in Wild
-Decision
Descriptions
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).
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) .
It was discovered that the "setElementTypePrefix()" function incorrectly extracted XML namespace prefixes. By tricking an application into processing a specially crafted XML file, an attacker could cause unusually high consumption of memory resources and possibly lead to a denial of service.
CVSS Scores
SSVC
- Decision:-
Timeline
- 2019-06-24 CVE Reserved
- 2019-06-24 CVE Published
- 2024-08-05 CVE Updated
- 2024-08-05 First Exploit
- 2024-11-14 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
CWE
- CWE-400: Uncontrolled Resource Consumption
- CWE-611: Improper Restriction of XML External Entity Reference
CAPEC
References (23)
URL | Tag | Source |
---|---|---|
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226 | Issue Tracking | |
https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes | Release Notes | |
https://lists.debian.org/debian-lts-announce/2019/06/msg00028.html | Mailing List | |
https://seclists.org/bugtraq/2019/Jun/39 | Mailing List | |
https://security.netapp.com/advisory/ntap-20190703-0001 | Third Party Advisory | |
https://support.f5.com/csp/article/K51011533 | Third Party Advisory | |
https://www.tenable.com/security/tns-2021-11 | Third Party Advisory |
URL | Date | SRC |
---|---|---|
https://github.com/libexpat/libexpat/pull/262 | 2024-08-05 |
Affected Vendors, Products, and Versions
Vendor | Product | Version | Other | Status | ||||||
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Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
Libexpat Project Search vendor "Libexpat Project" | Libexpat Search vendor "Libexpat Project" for product "Libexpat" | < 2.2.7 Search vendor "Libexpat Project" for product "Libexpat" and version " < 2.2.7" | - |
Affected
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Canonical Search vendor "Canonical" | Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux" | 12.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "12.04" | - |
Affected
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Canonical Search vendor "Canonical" | Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux" | 14.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "14.04" | esm |
Affected
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Canonical Search vendor "Canonical" | Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux" | 16.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "16.04" | lts |
Affected
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Canonical Search vendor "Canonical" | Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux" | 18.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "18.04" | lts |
Affected
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Canonical Search vendor "Canonical" | Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux" | 18.10 Search vendor "Canonical" for product "Ubuntu Linux" and version "18.10" | - |
Affected
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Canonical Search vendor "Canonical" | Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux" | 19.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "19.04" | - |
Affected
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Debian Search vendor "Debian" | Debian Linux Search vendor "Debian" for product "Debian Linux" | 8.0 Search vendor "Debian" for product "Debian Linux" and version "8.0" | - |
Affected
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Debian Search vendor "Debian" | Debian Linux Search vendor "Debian" for product "Debian Linux" | 9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0" | - |
Affected
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Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | 29 Search vendor "Fedoraproject" for product "Fedora" and version "29" | - |
Affected
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Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | 30 Search vendor "Fedoraproject" for product "Fedora" and version "30" | - |
Affected
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Opensuse Search vendor "Opensuse" | Leap Search vendor "Opensuse" for product "Leap" | 15.0 Search vendor "Opensuse" for product "Leap" and version "15.0" | - |
Affected
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Opensuse Search vendor "Opensuse" | Leap Search vendor "Opensuse" for product "Leap" | 15.1 Search vendor "Opensuse" for product "Leap" and version "15.1" | - |
Affected
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Oracle Search vendor "Oracle" | Hospitality Res 3700 Search vendor "Oracle" for product "Hospitality Res 3700" | >= 5.7 <= 5.7.6 Search vendor "Oracle" for product "Hospitality Res 3700" and version " >= 5.7 <= 5.7.6" | - |
Affected
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Oracle Search vendor "Oracle" | Http Server Search vendor "Oracle" for product "Http Server" | 12.1.3.0 Search vendor "Oracle" for product "Http Server" and version "12.1.3.0" | - |
Affected
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Oracle Search vendor "Oracle" | Http Server Search vendor "Oracle" for product "Http Server" | 12.2.1.4.0 Search vendor "Oracle" for product "Http Server" and version "12.2.1.4.0" | - |
Affected
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Oracle Search vendor "Oracle" | Outside In Technology Search vendor "Oracle" for product "Outside In Technology" | 8.5.4 Search vendor "Oracle" for product "Outside In Technology" and version "8.5.4" | - |
Affected
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Oracle Search vendor "Oracle" | Outside In Technology Search vendor "Oracle" for product "Outside In Technology" | 8.5.5 Search vendor "Oracle" for product "Outside In Technology" and version "8.5.5" | - |
Affected
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Tenable Search vendor "Tenable" | Nessus Search vendor "Tenable" for product "Nessus" | < 8.15.0 Search vendor "Tenable" for product "Nessus" and version " < 8.15.0" | - |
Affected
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