Denial of service in Wireshark

1) Infinite loop

EUVDB-ID: #VU47429

Risk: Medium

CVSSv3.1: 6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2020-26575

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Exploit availability: No

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

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Wireshark: 3.2.0 - 3.2.7

CPE2.3

• cpe:2.3:a:wireshark_org:wireshark:3.2.7:*:*:*:*:*:*:*

External links

http://gitlab.com/wireshark/wireshark/-/commit/3ff940652962c099b73ae3233322b8697b0d10ab
http://gitlab.com/wireshark/wireshark/-/issues/16887
http://gitlab.com/wireshark/wireshark/-/merge_requests/467
http://gitlab.com/wireshark/wireshark/-/merge_requests/471
http://gitlab.com/wireshark/wireshark/-/merge_requests/472
http://gitlab.com/wireshark/wireshark/-/merge_requests/473

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.