#VU47429 Infinite loop in Wireshark - CVE-2020-26575

Vulnerability identifier: #VU47429

Vulnerability risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-26575

CWE-ID: CWE-835

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 attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to infinite loop within the Facebook Zero Protocol (aka FBZERO) dissector in epan/dissectors/packet-fbzero.c. A remote attacker can pass specially crafted traffic to the application, consume all available system resources and cause denial of service conditions.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Wireshark: 3.2.0 - 3.2.7

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External links
https://www.wireshark.org/security/wnpa-sec-2020-14.html
https://gitlab.com/wireshark/wireshark/-/commit/3ff940652962c099b73ae3233322b8697b0d10ab
https://gitlab.com/wireshark/wireshark/-/issues/16887
https://gitlab.com/wireshark/wireshark/-/merge_requests/467
https://gitlab.com/wireshark/wireshark/-/merge_requests/471
https://gitlab.com/wireshark/wireshark/-/merge_requests/472
https://gitlab.com/wireshark/wireshark/-/merge_requests/473

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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.