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CVE PROGRAM SOURCE RECORD6.1 Medium

CVE-2021-32749

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

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Status
Published
Published
Updated
Assigning organization
GitHub_M

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

fail2ban fail2ban

  • <= 0.9.7affected
  • >= 0.10.0, <= 0.10.6affected
  • >= 0.11.0, <= 0.11.2affected

References