Infinite loop in Wireshark - CVE-2021-39923

Vulnerability identifier: #VU58218

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-39923

CWE-ID: CWE-835

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability exists due to infinite loop in the PNRP dissector. A remote attacker can send specially crafted packets through the application, consume all available system resources and perform a denial of service (DoS) attack.

Wireshark
Amazon Linux AMI
Oracle Solaris
Fedora
wireshark (Debian package)
wireshark

Install updates from vendor's website.

Wireshark - addressed in versions 3.2.18, 3.4.10
wireshark (Debian package) - update to 3.4.10-0+deb11u1
wireshark - addressed in versions 3.6.0-1.fc34, 3.6.0-1.fc35
wireshark - update to 4.0.2-1

• https://www.wireshark.org/security/wnpa-sec-2021-11.html

• Multiple vulnerabilities in Wireshark
• Debian update for wireshark
• Multiple vulnerabilities in Oracle Solaris third-party software
• Amazon Linux AMI update for wireshark
• Fedora 34 update for wireshark
• Fedora 35 update for wireshark