Code Injection in Fail2ban - CVE-2021-32749
Published: July 23, 2021
Vulnerability identifier: #VU55278
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-32749
CWE-ID: CWE-94
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to improper input validation in the mailing action mail-whois. A remote attacker can send a specially crafted request and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
Fail2ban
Gentoo Linux
Fedora
fail2ban
net-mail/mailutils
Gentoo Linux
Fedora
fail2ban
net-mail/mailutils
How to mitigate CVE-2021-32749
Install updates from vendor's website.
Fail2ban - addressed in versions 0.10.7, 0.11.3
fail2ban - addressed in versions 0.11.2-3.el7, 0.11.2-9.fc34, 0.11.2-9.fc35
net-mail/mailutils - update to 3.12-r3
fail2ban - addressed in versions 0.11.2-3.el7, 0.11.2-9.fc34, 0.11.2-9.fc35
net-mail/mailutils - update to 3.12-r3