Upstream information

CVE-2021-32749 at MITRE

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.

SUSE information

Overall state of this security issue: Does not affect SUSE products

This issue is currently rated as having moderate severity.

CVSS v2 Scores
  National Vulnerability Database
Base Score 6.8
Vector AV:N/AC:M/Au:N/C:P/I:P/A:P
Access Vector Network
Access Complexity Medium
Authentication None
Confidentiality Impact Partial
Integrity Impact Partial
Availability Impact Partial
CVSS v3 Scores
  National Vulnerability Database
Base Score 8.1
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Access Vector Network
Access Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact High
CVSSv3 Version 3.1
SUSE Bugzilla entry: 1188610 [RESOLVED / FIXED]

SUSE Security Advisories:

List of released packages

Product(s) Fixed package version(s) References
SUSE Package Hub for SUSE Linux Enterprise 15 SP1
  • fail2ban >= 0.11.2-bp151.3.3.1
  • monitoring-plugins-fail2ban >= 0.11.2-bp151.3.3.1
Patchnames:
openSUSE-2021-1274
SUSE Package Hub for SUSE Linux Enterprise 15 SP2
  • fail2ban >= 0.11.2-bp152.4.3.1
  • monitoring-plugins-fail2ban >= 0.11.2-bp152.4.3.1
Patchnames:
openSUSE-2021-1274
SUSE Package Hub for SUSE Linux Enterprise 15 SP3
  • fail2ban >= 0.11.2-bp153.2.3.1
  • monitoring-plugins-fail2ban >= 0.11.2-bp153.2.3.1
Patchnames:
openSUSE-2021-1274
openSUSE Leap 15.2
  • fail2ban >= 0.11.2-lp152.3.3.1
  • monitoring-plugins-fail2ban >= 0.11.2-lp152.3.3.1
Patchnames:
openSUSE-2021-1274
openSUSE Leap 15.3
  • fail2ban >= 0.11.2-bp153.2.3.1
  • monitoring-plugins-fail2ban >= 0.11.2-bp153.2.3.1
Patchnames:
openSUSE-2021-1274