Possible RCE vulnerability in mailing action using mailutils (mail-whois)

fail2ban is a daemon to ban hosts that cause multiple authentication errors. In versions 0.9.7 and prior, 0.10.0 through 0.10.6, and 0.11.0 through 0.11.2, there is a vulnerability that leads to possible remote code execution in the mailing action mail-whois. Command `mail` from mailutils package used in mail actions like `mail-whois` can execute command if unescaped sequences (`\n~`) are available in "foreign" input (for instance in whois output). To exploit the vulnerability, an attacker would need to insert malicious characters into the response sent by the whois server, either via a MITM attack or by taking over a whois server. The issue is patched in versions 0.10.7 and 0.11.3. As a workaround, one may avoid the usage of action `mail-whois` or patch the vulnerability manually.

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:N

OS命令中使用的特殊元素转义处理不恰当(OS命令注入)

fail2ban 代码注入漏洞

fail2ban是一个应用软件。禁止导致多个身份验证错误的主机。 fail2ban存在代码注入漏洞，该漏洞可能导致远程代码执行。要利用该漏洞，攻击者需要通过 MITM 攻击或接管 whois 服务器将恶意字符插入到 whois 服务器发送的响应中。以下产品和版本受到影响：0.9.7 及更早版本、0.10.0到0.10.6版本、0.11.0到0.11.2版本。

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