CVE-2021-32749

Name
CVE-2021-32749
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.
NVD Severity
high
Other trackers
Mailing lists
Exploits
Forges
GitHub (code, issues), Aports (code, issues)

References

Type URI
MISC https://github.com/fail2ban/fail2ban/commit/410a6ce5c80dd981c22752da034f2529b5eee844
MISC https://github.com/fail2ban/fail2ban/commit/2ed414ed09b3bb4c478abc9366a1ff22024a33c9
CONFIRM https://github.com/fail2ban/fail2ban/security/advisories/GHSA-m985-3f3v-cwmm
FEDORA https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5WHJK2X2MR2WDYZMCW7COZXJDUSDYMY6/
FEDORA https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZRYQ77MTX5WSV33VCJLK4KBKR55QZ7ZA/

Match rules

CPE URI Source package Min version Max version
cpe:2.3:a:fail2ban:fail2ban:*:*:*:*:*:*:*:* fail2ban >= None <= 0.9.7
cpe:2.3:a:fail2ban:fail2ban:*:*:*:*:*:*:*:* fail2ban >= 0.10.0 < 0.10.7
cpe:2.3:a:fail2ban:fail2ban:*:*:*:*:*:*:*:* fail2ban >= 0.11.0 < 0.11.3

Vulnerable and fixed packages

Source package Branch Version Maintainer Status
fail2ban edge-main 0.11.2-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
fail2ban 3.14-main 0.11.2-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
fail2ban 3.13-main 0.11.1-r4 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
fail2ban 3.12-main 0.11.1-r3 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
fail2ban 3.11-main 0.10.4-r3 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable