CVE-2023-4255

W3m: out-of-bounds write in function checktype() in etc.c (incomplete fix for cve-2022-38223)

Severity Score

5.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An out-of-bounds write issue has been discovered in the backspace handling of the checkType() function in etc.c within the W3M application. This vulnerability is triggered by supplying a specially crafted HTML file to the w3m binary. Exploitation of this flaw could lead to application crashes, resulting in a denial of service condition.

Se descubrió un problema de escritura fuera de los límites en el manejo de retroceso de la función checkType() en etc.c dentro de la aplicación W3M. Esta vulnerabilidad se activa al proporcionar un archivo HTML especialmente manipulado al binario w3m. La explotación de este fallo podría provocar fallos en la aplicación, lo que resultaría en una condición de denegación de servicio.

*Credits: Red Hat would like to thank iskindar97@gmail.com for reporting this issue.

CVSS Scores

NISTv3.1 5.5

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2023-08-08 CVE Reserved
2023-12-21 CVE Published
2024-03-27 EPSS Updated
2024-08-02 CVE Updated
2024-08-02 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-787: Out-of-bounds Write

CAPEC

References (7)

URL	Tag	Source
https://bugzilla.redhat.com/show_bug.cgi?id=2255207	Issue Tracking
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AULOBQJLXE2KCT5UVQMKGEFL4GFIAOED
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MKFZQUK7FPWWJQYICDZZ4YWIPUPQ2D3R
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TODROGVCWZ435HQIZE6ARQC5LPQLIA5C

URL	Date	SRC
https://github.com/tats/w3m/issues/268	2024-08-02

URL	Date	SRC
https://github.com/tats/w3m/commit/edc602651c506aeeb60544b55534dd1722a340d3	2024-03-27
https://github.com/tats/w3m/pull/273	2024-03-27

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Tats Search vendor "Tats"		W3m Search vendor "Tats" for product "W3m"				0.5.3\+git20230121-1 Search vendor "Tats" for product "W3m" and version "0.5.3\+git20230121-1"		-		Affected
Tats Search vendor "Tats"		W3m Search vendor "Tats" for product "W3m"				0.5.3\+git20230121-2 Search vendor "Tats" for product "W3m" and version "0.5.3\+git20230121-2"		-		Affected
Tats Search vendor "Tats"		W3m Search vendor "Tats" for product "W3m"				0.5.3\+git20230129 Search vendor "Tats" for product "W3m" and version "0.5.3\+git20230129"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Extra Packages For Enterprise Linux Search vendor "Fedoraproject" for product "Extra Packages For Enterprise Linux"				8.0 Search vendor "Fedoraproject" for product "Extra Packages For Enterprise Linux" and version "8.0"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				39 Search vendor "Fedoraproject" for product "Fedora" and version "39"		-		Affected