Remote code execution in W3M



Published: 2024-01-02
Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2023-4255
CWE-ID CWE-787
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		w3m
Server applications / Web servers

Vendor w3m.sourceforge.net

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Out-of-bounds write

EUVDB-ID: #VU84908

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-4255

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error when processing untrusted input within the checkType() function in etc.c. A remote attacker can create a specially crafted HTML file, trick the victim into opening it using the affected software, trigger an out-of-bounds write and execute arbitrary code on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

w3m: 0.5.3+git20220429 - 0.5.3+git20230121

CPE2.3 External links

http://bugzilla.redhat.com/show_bug.cgi?id=2255207
http://github.com/tats/w3m/commit/edc602651c506aeeb60544b55534dd1722a340d3
http://github.com/tats/w3m/issues/268
http://github.com/tats/w3m/pull/273


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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