Vulnerability identifier: #VU10375

Vulnerability risk: Low

CVSSv3.1: 4.5 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-6198

CWE-ID: CWE-264

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
w3m
Server applications / Web servers

Vendor: w3m.sourceforge.net

Description
The vulnerability allows a local attacker to cause DoS condition on the target system.

The weakness exists due to improper handling of temporary files when the ~/.w3m directory is unwritable. A local attacker can craft a symlink attack to bypass security restrictions and overwrite arbitrary files.

Mitigation
Install update from vendor's website.

Vulnerable software versions

w3m: 0.5.3

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External links
http://github.com/tats/w3m/commit/18dcbadf2771cdb0c18509b14e4e73505b242753

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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