CVE-2019-15903

expat: heap-based buffer over-read via crafted XML input

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

In libexpat before 2.2.8, crafted XML input could fool the parser into changing from DTD parsing to document parsing too early; a consecutive call to XML_GetCurrentLineNumber (or XML_GetCurrentColumnNumber) then resulted in a heap-based buffer over-read.

En libexpat versiones anteriores a 2.2.8, una entrada XML especialmente diseñada podría engañar al analizador para que cambie de análisis DTD a análisis de documentos demasiado pronto; una llamada consecutiva a la función XML_GetCurrentLineNumber (o XML_GetCurrentColumnNumber) luego resultó en una lectura excesiva del búfer en la región heap de la memoria.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-09-04 CVE Reserved
2019-09-04 CVE Published
2024-08-05 CVE Updated
2024-08-05 First Exploit
2024-08-28 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-125: Out-of-bounds Read
CWE-776: Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')

CAPEC

References (61)

URL	Tag	Source
http://packetstormsecurity.com/files/154503/Slackware-Security-Advisory-expat-Updates.html	Third Party Advisory
http://packetstormsecurity.com/files/154927/Slackware-Security-Advisory-python-Updates.html	Third Party Advisory
http://packetstormsecurity.com/files/154947/Slackware-Security-Advisory-mozilla-firefox-Updates.html	Third Party Advisory
http://seclists.org/fulldisclosure/2019/Dec/23	Mailing List
http://seclists.org/fulldisclosure/2019/Dec/26	Mailing List
http://seclists.org/fulldisclosure/2019/Dec/27	Mailing List
http://seclists.org/fulldisclosure/2019/Dec/30	Mailing List
https://github.com/libexpat/libexpat/issues/342	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/11/msg00006.html	Mailing List
https://lists.debian.org/debian-lts-announce/2019/11/msg00017.html	Mailing List
https://seclists.org/bugtraq/2019/Dec/17	Mailing List
https://seclists.org/bugtraq/2019/Dec/21	Mailing List
https://seclists.org/bugtraq/2019/Dec/23	Mailing List
https://seclists.org/bugtraq/2019/Nov/1	Mailing List
https://seclists.org/bugtraq/2019/Nov/24	Mailing List
https://seclists.org/bugtraq/2019/Oct/29	Mailing List
https://seclists.org/bugtraq/2019/Sep/30	Mailing List
https://seclists.org/bugtraq/2019/Sep/37	Mailing List
https://security.netapp.com/advisory/ntap-20190926-0004	Third Party Advisory
https://support.apple.com/kb/HT210785	Third Party Advisory
https://support.apple.com/kb/HT210788	Third Party Advisory
https://support.apple.com/kb/HT210789	Third Party Advisory
https://support.apple.com/kb/HT210790	Third Party Advisory
https://support.apple.com/kb/HT210793	Third Party Advisory
https://support.apple.com/kb/HT210794	Third Party Advisory
https://support.apple.com/kb/HT210795	Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2020.html	Third Party Advisory
https://www.oracle.com/security-alerts/cpuoct2020.html	Third Party Advisory
https://www.tenable.com/security/tns-2021-11	Third Party Advisory

URL	Date	SRC
https://github.com/libexpat/libexpat/issues/317	2024-08-05

URL	Date	SRC
https://github.com/libexpat/libexpat/commit/c20b758c332d9a13afbbb276d30db1d183a85d43	2023-11-07
https://github.com/libexpat/libexpat/pull/318	2023-11-07

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00080.html	2023-11-07
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00081.html	2023-11-07
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00000.html	2023-11-07
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00002.html	2023-11-07
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00003.html	2023-11-07
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00013.html	2023-11-07
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00016.html	2023-11-07
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00017.html	2023-11-07
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00018.html	2023-11-07
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00019.html	2023-11-07
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00008.html	2023-11-07
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html	2023-11-07
https://access.redhat.com/errata/RHSA-2019:3210	2023-11-07
https://access.redhat.com/errata/RHSA-2019:3237	2023-11-07
https://access.redhat.com/errata/RHSA-2019:3756	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A4TZKPJFTURRLXIGLB34WVKQ5HGY6JJA	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BDUTI5TVQWIGGQXPEVI4T2ENHFSBMIBP	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/S26LGXXQ7YF2BP3RGOWELBFKM6BHF6UG	2023-11-07
https://security.gentoo.org/glsa/201911-08	2023-11-07
https://usn.ubuntu.com/4132-1	2023-11-07
https://usn.ubuntu.com/4132-2	2023-11-07
https://usn.ubuntu.com/4165-1	2023-11-07
https://usn.ubuntu.com/4202-1	2023-11-07
https://usn.ubuntu.com/4335-1	2023-11-07
https://www.debian.org/security/2019/dsa-4530	2023-11-07
https://www.debian.org/security/2019/dsa-4549	2023-11-07
https://www.debian.org/security/2019/dsa-4571	2023-11-07
https://access.redhat.com/security/cve/CVE-2019-15903	2021-03-22
https://bugzilla.redhat.com/show_bug.cgi?id=1752592	2021-03-22

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Libexpat Project Search vendor "Libexpat Project"		Libexpat Search vendor "Libexpat Project" for product "Libexpat"				< 2.2.8 Search vendor "Libexpat Project" for product "Libexpat" and version " < 2.2.8"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				>= 2.7.0 < 2.7.17 Search vendor "Python" for product "Python" and version " >= 2.7.0 < 2.7.17"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				>= 3.5.0 < 3.5.8 Search vendor "Python" for product "Python" and version " >= 3.5.0 < 3.5.8"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				>= 3.6.0 < 3.6.10 Search vendor "Python" for product "Python" and version " >= 3.6.0 < 3.6.10"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				>= 3.7.0 < 3.7.5 Search vendor "Python" for product "Python" and version " >= 3.7.0 < 3.7.5"		-		Affected