#VU49036 Out-of-bounds read in Wireshark - CVE-2020-26421

Vulnerability identifier: #VU49036

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-26421

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Wireshark
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor: Wireshark.org

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

Crash in USB HID protocol dissector and possibly other dissectors in Wireshark 3.4.0 and 3.2.0 to 3.2.8 allows denial of service via packet injection or crafted capture file.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Wireshark: 3.2.0 - 3.2.8, 3.4.0

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External links
https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-26421.json
https://gitlab.com/wireshark/wireshark/-/issues/16958
https://www.wireshark.org/security/wnpa-sec-2020-17.html

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Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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