CVE-2023-4255 W3m: out-of-bounds write in function checktype() in etc.c (incomplete fix for cve-2022-38223)

2023-12-2116:08:39

CWE-787

redhat

www.cve.org

w3m

out-of-bounds write

checktype()

denial of service

5.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

6.4 Medium

AI Score

Confidence

High

0.002 Low

EPSS

Percentile

57.3%

JSON

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.

CNA Affected

[
  {
    "product": "w3m",
    "vendor": "n/a",
    "defaultStatus": "affected"
  },
  {
    "product": "Fedora",
    "vendor": "Fedora",
    "collectionURL": "https://packages.fedoraproject.org/",
    "packageName": "w3m",
    "defaultStatus": "affected"
  },
  {
    "product": "Extra Packages for Enterprise Linux",
    "vendor": "Fedora",
    "collectionURL": "https://packages.fedoraproject.org/",
    "packageName": "w3m",
    "defaultStatus": "affected"
  }
]