CVE-2017-18258

libxml2: Unrestricted memory usage in xz_head() function in xzlib.c

Severity Score

6.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The xz_head function in xzlib.c in libxml2 before 2.9.6 allows remote attackers to cause a denial of service (memory consumption) via a crafted LZMA file, because the decoder functionality does not restrict memory usage to what is required for a legitimate file.

La función xz_head en xzlib.c en libxml2, en versiones anteriores a la 2.9.6, permite que atacantes remotos provoquen una denegación de servicio (consumo de memoria) mediante un archivo LZMA. Esto se dene a que la funcionalidad de descifrado no restringe el uso de memoria a lo que se requiere para un archivo legítimo.

The libxml2 library is a development toolbox providing the implementation of various XML standards. Issues addressed include denial of service and null pointer vulnerabilities.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2018-04-08 CVE Reserved
2018-04-08 CVE Published
2024-08-05 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-400: Uncontrolled Resource Consumption
CWE-770: Allocation of Resources Without Limits or Throttling

CAPEC

References (8)

URL	Tag	Source
https://kc.mcafee.com/corporate/index?page=content&id=SB10284	X_refsource_confirm
https://lists.debian.org/debian-lts-announce/2018/09/msg00035.html	Mailing List
https://lists.debian.org/debian-lts-announce/2020/09/msg00009.html	Mailing List
https://security.netapp.com/advisory/ntap-20190719-0001	X_refsource_confirm

URL	Date	SRC

URL	Date	SRC
https://git.gnome.org/browse/libxml2/commit/?id=e2a9122b8dde53d320750451e9907a7dcb2ca8bb	2020-09-10

URL	Date	SRC
https://usn.ubuntu.com/3739-1	2020-09-10
https://access.redhat.com/security/cve/CVE-2017-18258	2020-03-31
https://bugzilla.redhat.com/show_bug.cgi?id=1566749	2020-03-31

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Xmlsoft Search vendor "Xmlsoft"		Libxml2 Search vendor "Xmlsoft" for product "Libxml2"				< 2.9.6 Search vendor "Xmlsoft" for product "Libxml2" and version " < 2.9.6"		-		Affected