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CVE-2023-4255

Published: 2 January 2024

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.

Priority

Medium

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package Release Status
w3m
Launchpad, Ubuntu, Debian
bionic
Released (0.5.3-36ubuntu0.1+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
focal
Released (0.5.3-37ubuntu0.2)
jammy
Released (0.5.3+git20210102-6ubuntu0.2)
lunar
Released (0.5.3+git20230121-2ubuntu0.23.04.1)
mantic
Released (0.5.3+git20230121-2ubuntu0.23.10.1)
trusty
Released (0.5.3-15ubuntu0.2+esm2)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream Needs triage

xenial Needs triage

Patches:
upstream: https://github.com/tats/w3m/commit/edc602651c506aeeb60544b55534dd1722a340d3

Severity score breakdown

Parameter Value
Base score 5.5
Attack vector Local
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H