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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
12cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
- osv-coords6 versionspkg:rpm/opensuse/fail2ban&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/fail2ban&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/fail2ban&distro=openSUSE%20Tumbleweedpkg:rpm/suse/fail2ban&distro=SUSE%20Package%20Hub%2015%20SP1pkg:rpm/suse/fail2ban&distro=SUSE%20Package%20Hub%2015%20SP2pkg:rpm/suse/fail2ban&distro=SUSE%20Package%20Hub%2015%20SP3
< 0.11.2-bp153.2.3.1+ 5 more
- (no CPE)range: < 0.11.2-bp153.2.3.1
- (no CPE)range: < 0.11.2-bp153.2.3.1
- (no CPE)range: < 0.11.2-3.1
- (no CPE)range: < 0.11.2-bp153.2.3.1
- (no CPE)range: < 0.11.2-bp153.2.3.1
- (no CPE)range: < 0.11.2-bp153.2.3.1
Patches
Vulnerability mechanics
References
6- github.com/fail2ban/fail2ban/commit/2ed414ed09b3bb4c478abc9366a1ff22024a33c9nvdPatchThird Party Advisory
- github.com/fail2ban/fail2ban/commit/410a6ce5c80dd981c22752da034f2529b5eee844nvdPatchThird Party Advisory
- github.com/fail2ban/fail2ban/security/advisories/GHSA-m985-3f3v-cwmmnvdExploitPatchThird Party Advisory
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5WHJK2X2MR2WDYZMCW7COZXJDUSDYMY6/nvd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZRYQ77MTX5WSV33VCJLK4KBKR55QZ7ZA/nvd
- security.gentoo.org/glsa/202310-13nvd
News mentions
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